AWS S3 (Amazon Simple Storage Service) is one of the most established cloud storage services available today. It provides scalable object storage, multiple storage classes, lifecycle automation, encryption, access controls, replication, and broad integration with the AWS ecosystem.

However, S3 is not necessarily the most practical choice for every workload. Request charges, outbound data-transfer fees, configuration complexity, or an organization’s existing cloud stack may make another provider easier to operate or budget for.

Some teams also want an S3-compatible service that lets them reuse existing SDKs, backup software, or deployment workflows without moving their entire infrastructure to AWS. Others need storage that works closely with a particular application platform, such as Google Cloud, Azure, DigitalOcean, Cloudflare, or Supabase.

This guide compares eight AWS S3 alternatives:

1. Google Cloud Storage
2. Microsoft Azure Blob Storage
3. IBM Cloud Object Storage
4. Wasabi
5. Backblaze B2
6. DigitalOcean Spaces
7. Cloudflare R2
8. Supabase Storage

The comparison looks beyond the advertised storage rate. It also considers egress, request charges, minimum storage periods, ecosystem integration, S3 API compatibility, security controls, and likely migration effort.

Editorial note: Pricing and technical details in this guide were checked against official provider documentation. Cloud-storage prices can change and may vary by region, currency, storage class, redundancy option, request volume, retention period, and account agreement. Confirm your estimate with the provider before migrating production data.

Top AWS S3 Alternatives

The most suitable AWS S3 alternative depends on the workload:

• Google Cloud Storage may fit applications already using Google Cloud analytics and AI services.
• Azure Blob Storage may be a natural choice for Azure-hosted applications, although it does not provide a native S3 API.
• IBM Cloud Object Storage may suit IBM Cloud and hybrid-cloud environments.
• Wasabi may be cost-effective for long-lived backups stored at one-terabyte scale or above.
• Backblaze B2 may fit backup, NAS, media, and general-purpose object storage.
• DigitalOcean Spaces offers a relatively straightforward package for developers already using DigitalOcean.
• Cloudflare R2 is particularly relevant when outbound transfer represents a large portion of the existing storage bill.
• Supabase Storage may be convenient for application files that need integration with Supabase Auth, Postgres, and Row Level Security.

There is no universal winner. The final choice should reflect storage volume, object size, request frequency, outbound transfer, retention period, compliance needs, and where the rest of the application runs.

We’ve Compared AWS S3 Alternatives at a Glance

Unit note: GB and GiB are not exactly the same unit. Providers may also calculate storage using hourly averages, daily peaks, or monthly averages. The figures above should therefore be treated as comparison points rather than perfectly interchangeable measurements.

What Is AWS S3?

AWS S3 is an object-storage service used to store and retrieve unstructured data, including:

• Images and videos
• Application assets
• Log files
• Backups and archives
• Machine-learning datasets
• Data-lake objects
• Software packages
• Static website files
• User-generated content

S3 stores data as objects inside buckets. Each object contains the data itself, an object key, and associated metadata. If you need a deeper introduction to the terminology, see this explanation of AWS S3 bucket objects.

Object storage differs from traditional file and block storage. File storage organizes data into folders and paths, while block storage divides data into fixed-size blocks commonly used by databases and virtual machines. Object storage is generally better suited to large collections of independently addressed files and unstructured data. For more context, see the comparison of file, block, and object storage.

Amazon S3 provides capabilities such as:

• Multiple storage classes
• Lifecycle management
• Object versioning
• Same-region and cross-region replication
• Server-side encryption
• AWS Key Management Service integration
• Identity and Access Management policies
• Presigned URLs
• Event notifications
• S3 Object Lock
• Access logging and inventory
• Integration with AWS compute, analytics, security, and CDN services

AWS states that S3 Standard is designed for 99.999999999% durability and 99.99% availability over a given year. These figures describe the service’s design objectives. They do not replace backup planning, recovery testing, least-privilege access, or multi-region architecture.

See the official Amazon S3 data durability documentation for details.

Why Consider an Alternative to AWS S3?

AWS S3 remains a capable platform. Evaluating alternatives does not necessarily mean that S3 is unreliable or unsuitable. In many cases, another service may simply align better with the organization’s infrastructure, budget model, or operational skills.

Outbound Data-Transfer Costs

Storage is only one part of an object-storage bill. Applications that deliver large files, software downloads, images, video, or customer-generated content may incur substantial outbound transfer charges.

Providers such as Cloudflare R2, Wasabi, and Backblaze B2 use different egress models. These models may be easier to budget for certain workloads, but “free egress” should always be read alongside the provider’s policies and any charges imposed by connected services.

Request and Retrieval Charges

A bucket containing millions of small objects can have a different cost profile from one containing a few large backup files.

Depending on the provider and storage class, charges may apply to:

• PUT requests
• GET requests
• LIST requests
• Multipart uploads
• Lifecycle transitions
• Retrieval
• Replication
• Early deletion
• Cross-region transfer

Applications should also account for provider limits and throttling behavior. A compatible API endpoint does not necessarily provide the same quotas, retry behavior, or request capacity as AWS. Understanding API rate limiting can help teams design retry logic, exponential backoff, and request queues that behave safely during migration or traffic spikes.

Minimum Storage Duration

Some lower-cost and infrequent-access tiers impose a minimum storage period. Deleting, replacing, or transitioning an object before that period ends may result in an additional charge.

This is particularly relevant for:

• Temporary build artifacts
• Frequently rotated backups
• Application caches
• Short-lived media files
• Continuously replaced log archives
• Data-processing intermediates

Existing Cloud Ecosystem

A provider may be easier to operate when the rest of the application already runs on the same platform.

For example:

• Google Cloud Storage may integrate naturally with BigQuery, Dataflow, and Vertex AI.
• Azure Blob Storage may be a better fit for applications already hosted on Azure.
• IBM Cloud Object Storage may suit organizations using IBM Cloud or a hybrid-cloud architecture.
• DigitalOcean Spaces may simplify storage for DigitalOcean Droplets and Kubernetes.
• Cloudflare R2 may work well with Cloudflare Workers and Cloudflare’s content-delivery network.
• Supabase Storage may reduce integration work for applications already using Supabase Auth and Postgres.

Simpler Pricing or Administration

Some organizations do not need every advanced S3 feature. A provider with fewer configuration choices and a bundled pricing model can reduce operational overhead.

The trade-off is that a simpler platform may provide:

• Fewer storage classes
• Fewer regions
• Less granular access management
• Fewer compliance options
• Fewer native integrations
• More limited API compatibility
• Less mature enterprise support

Reducing Dependence on One Cloud Provider

Using a secondary object-storage provider can support backup isolation, disaster recovery, negotiation flexibility, or a multi-cloud strategy.

However, storing copies with multiple providers is not enough by itself. Teams still need to define recovery time objectives, recovery point objectives, ownership, testing procedures, and failover steps. Those decisions should form part of a documented disaster recovery plan.

How We Evaluated These AWS S3 Alternatives

This comparison considers nine factors:

1. Storage pricing: The published storage rate and any minimum commitment.
2. Outbound transfer: The cost of downloading or serving data.
3. Request charges: Fees for reading, writing, listing, or modifying objects.
4. Retention requirements: Minimum storage periods and early-deletion charges.
5. S3 compatibility: Whether common S3 SDKs and tools can be reused.
6. Ecosystem integration: Connections with compute, databases, analytics, authentication, CDN, and backup tools.
7. Security controls: Encryption, access policies, immutability, and audit capabilities.
8. Operational fit: Suitability for backups, application files, content delivery, media, or analytics.
9. Migration effort: The likely work required to move data, permissions, metadata, and application logic.

No provider is ranked as universally superior. A low-cost backup repository and a high-request application asset store have different requirements, even when both use object storage.

1. Google Cloud Storage

Google Cloud Storage is Google Cloud’s managed object-storage service. It can store application data, backups, media, archives, analytics datasets, and machine-learning assets.

It is often a practical option for organizations already using Google Cloud services. However, it should not be treated as a complete drop-in replacement for every AWS S3 feature.

Key Features

• Regional, dual-region, and multi-region bucket locations
• Standard, Nearline, Coldline, and Archive storage classes
• Lifecycle management
• Object versioning
• Retention policies and object holds
• Identity and Access Management integration
• Customer-managed encryption options
• Signed URLs
• Storage Transfer Service
• Autoclass
• Integration with BigQuery, Dataflow, Dataproc, and Vertex AI

Storage class and bucket location are separate choices. A Standard storage bucket is not automatically multi-region. Users can select regional, dual-region, or multi-region placement depending on latency, resilience, and data-location requirements.

See Google Cloud Storage bucket locations.

Pricing

Google Cloud Storage does not have one universal storage rate. Pricing depends on:

• Bucket location
• Storage class
• Data processing
• Request class
• Retrieval
• Network destination
• Replication configuration
• Minimum storage duration

Standard regional storage in selected US regions is approximately $0.020 per GiB-month. Other regions, dual-region configurations, and multi-region buckets may have different rates.

The Google Cloud Free Tier includes up to 5 GB-months of Standard storage, subject to eligible locations and other usage limits.

Check the current rates on the official Google Cloud Storage pricing page.

S3 Compatibility

Google Cloud Storage provides an XML API that is interoperable with some S3 tools and libraries. Applications may need to change the request endpoint and use Google Cloud HMAC credentials.

That is partial interoperability rather than complete feature parity. Teams should test:

• Authentication
• Bucket policies
• Multipart uploads
• Presigned URLs
• Metadata
• Checksums
• Lifecycle behavior
• SDK assumptions

See Google Cloud Storage interoperability.

Advantages

• Strong integration with Google Cloud analytics and AI services
• Several storage classes and location options
• Suitable for data lakes and machine-learning datasets
• Lifecycle, versioning, and retention controls
• Broad enterprise security capabilities
• Free allowance for eligible workloads

Trade-offs

• Pricing requires consideration of storage, operations, retrieval, and networking
• Multi-region storage may cost more than a regional bucket
• S3 interoperability does not cover every S3 feature
• Teams unfamiliar with Google Cloud may face a learning curve

Potential Use Cases

• BigQuery and Dataflow datasets
• Machine-learning training data
• Application assets
• Data lakes
• Backup and archive storage
• Multi-region content
• Static assets delivered through a CDN

Who Should Consider It?

Google Cloud Storage may fit teams that already use Google Cloud or need close integration with Google’s analytics and AI services. Teams migrating a complex S3 application should verify API behavior before assuming drop-in compatibility.

2. Microsoft Azure Blob Storage

Azure Blob Storage is Microsoft’s managed object-storage service for documents, media, backups, logs, archives, application files, and analytics datasets.

It is particularly relevant to organizations already operating applications, identity systems, or data platforms on Azure.

Key Features

• Hot, Cool, Cold, and Archive tiers
• Locally redundant, zone-redundant, geo-redundant, and geo-zone-redundant options
• Lifecycle management
• Blob versioning
• Soft delete
• Immutable storage policies
• Customer-managed encryption keys
• Microsoft Entra ID integration
• Shared access signatures
• Azure Data Lake Storage support
• NFS 3.0 and SFTP support in eligible configurations
• Integration with Azure analytics and machine-learning services

Azure Blob Storage also supports Azure Data Lake Storage, which adds a hierarchical namespace for analytics workloads.

See the Azure Blob Storage introduction.

Pricing

Azure Blob Storage pricing depends on:

• Azure region
• Access tier
• Redundancy configuration
• Storage account type
• Stored volume
• Read and write operations
• Data retrieval
• Outbound transfer
• Early deletion
• Reserved capacity
• Customer agreement

Because these variables materially affect the price, one rate should not be presented as a universal starting price.

Use the official Azure Blob Storage pricing page or Azure Pricing Calculator.

S3 Compatibility

Azure Blob Storage does not natively implement the S3 API. It uses the Azure Blob Storage REST API, Azure SDKs, Azure CLI, PowerShell, SFTP, or NFS, depending on the configuration.

An S3 migration may require teams to:

• Change application endpoints
• Replace AWS SDK calls
• Update authentication
• Convert bucket policies
• Use a migration tool
• Deploy a compatibility gateway
• Retest upload, download, and retry behavior

Microsoft provides a technical overview in Azure storage services for AWS professionals.

Advantages

• Deep integration with Azure services
• Several redundancy options
• Multiple access tiers
• Enterprise identity and security controls
• Support for data-lake workloads
• Lifecycle, versioning, and immutability capabilities
• SFTP and NFS options in supported configurations

Trade-offs

• Pricing can be difficult to estimate without a detailed workload model
• Archive retrieval can take time and incur additional charges
• Lower-cost tiers may have minimum storage periods
• There is no native S3 API
• Application migrations may require more engineering than an endpoint change

Potential Use Cases

• Azure-hosted applications
• Enterprise document storage
• Media repositories
• Data lakes
• Backup and disaster recovery
• Long-term archiving
• Microsoft-centered infrastructure

Who Should Consider It?

Azure Blob Storage may be a practical choice for organizations already using Azure. It is less suitable for teams that require an S3 endpoint without modifying their application.

3. IBM Cloud Object Storage

IBM Cloud Object Storage is a managed object-storage service for backups, archives, application data, analytics, and large unstructured datasets.

It may be relevant to enterprises using IBM Cloud, IBM data services, or a hybrid-cloud architecture.

Key Features

• Smart Tier storage
• Standard, Vault, Cold Vault, and Flex classes
• S3-compatible API
• IBM Cloud Identity and Access Management
• Encryption
• Key Protect and Hyper Protect Crypto Services integration
• Object versioning
• Retention policies
• Immutable storage options
• Regional and cross-region resiliency
• IBM Aspera integration
• Lifecycle configuration
• Private service endpoints

Smart Tier is intended for workloads where access patterns are difficult to predict. It evaluates monthly activity and applies an applicable pricing tier without requiring teams to move objects manually between separate buckets.

Pricing

IBM Cloud Object Storage pricing depends on:

• Storage class
• Region
• Stored volume
• Public outbound bandwidth
• Class A and Class B requests
• Data retrieval
• Plan type
• Optional transfer services

IBM’s current Free Tier under the Standard plan includes monthly allowances for:

• Up to 5 GB of Smart Tier storage
• 2,000 Class A requests
• 20,000 Class B requests
• 10 GB of data retrieval
• 5 GB of public outbound bandwidth

The Free Tier applies for 12 months under IBM’s documented eligibility conditions. The older claim that IBM universally provides a permanent 25 GB Lite allowance is no longer reliable.

See the IBM Cloud Object Storage plan FAQ and IBM Cloud Object Storage billing documentation.

S3 Compatibility

IBM states that it makes a sustained effort to maintain compatibility with the S3 API. The AWS CLI can also be configured to work with IBM Cloud Object Storage endpoints.

Applications should still test:

• HMAC authentication
• Bucket policies
• Lifecycle behavior
• Object tagging
• Multipart uploads
• Presigned URLs
• SDK-specific assumptions

See the IBM Cloud Object Storage AWS CLI documentation.

Advantages

• Suitable for IBM and hybrid-cloud environments
• S3-compatible API
• Smart Tier for changing access patterns
• Private connectivity options
• Enterprise key-management integrations
• Multiple resiliency configurations
• Useful for large datasets and backup systems

Trade-offs

• Pricing is more complex than a flat per-terabyte service
• Public bandwidth and requests may affect the bill
• The ecosystem is smaller than AWS, Azure, or Google Cloud
• S3 compatibility does not imply identical AWS behavior
• Some advantages are most relevant when paired with IBM services

Potential Use Cases

• Hybrid-cloud storage
• Enterprise backups
• Secure data vaults
• Analytics datasets
• Media repositories
• Regulated workloads
• IBM Cloud applications

Who Should Consider It?

IBM Cloud Object Storage may be worth evaluating when an organization already uses IBM Cloud or needs hybrid-cloud integration. It is less compelling when the only requirement is the lowest possible storage rate.

4. Wasabi

Wasabi is an S3-compatible object-storage provider focused on relatively simple pricing and frequently accessible data.

It is commonly evaluated for backups, surveillance footage, media archives, and other workloads where objects remain stored for several months.

Key Features

• S3-compatible API
• Object Lock
• Object versioning
• Bucket replication
• Encryption
• Multi-user authentication
• Integration with backup and media software
• No separate API request charge under standard conditions
• No separate egress charge within the applicable policy

Pricing

Wasabi lists Pay-as-You-Go storage at:

• $7.99 per TB per month
• Approximately $0.0078 per GB per month

However, the headline rate needs two qualifications.

One-Terabyte Monthly Minimum

Pay-as-You-Go accounts generally have a minimum monthly charge equivalent to one terabyte of active storage. An account storing substantially less than one terabyte may still pay the minimum monthly amount.

Minimum Storage Duration

The default minimum storage duration for standard Pay-as-You-Go object storage is 90 days.

If an object is deleted before completing that period, Wasabi may charge for the remaining days as timed deleted storage.

See the Wasabi pricing FAQ and Wasabi minimum storage duration policy.

Advantages

• Lower listed storage rate than many hyperscale Standard tiers
• S3-compatible endpoint
• No separate egress charge within the applicable policy
• No separate API request charge under standard conditions
• Object Lock support
• Broad backup-software integration
• Potentially predictable for stable datasets

Trade-offs

• The one-terabyte minimum can make small workloads less economical
• The default 90-day minimum does not suit short-lived objects
• Fewer native cloud services than AWS, Azure, or Google Cloud
• Regional availability is more limited than the largest providers
• Free egress remains subject to policy and account terms

Potential Use Cases

• Long-term backup repositories
• Ransomware-resistant backups
• Video archives
• Surveillance footage
• Secondary cloud copies
• Large, stable datasets

Cloud storage can support a backup strategy, but synchronization alone should not be treated as a backup. Teams should maintain independent copies, test restores, and understand how to back up files correctly.

Who Should Consider It?

Wasabi may suit teams that store at least one terabyte and retain most objects for 90 days or longer. It may be less cost-effective for temporary data or frequently replaced objects.

5. Backblaze B2 Cloud Storage

Backblaze B2 is an object-storage service focused on backup, NAS, media, and general cloud-storage workloads.

It provides a native B2 API and an S3-compatible API, allowing many existing storage and backup tools to connect with limited changes.

Key Features

• S3-compatible API
• Native B2 API
• Object Lock
• File versioning
• Lifecycle rules
• Server-side encryption
• Presigned URLs
• Backup and NAS integrations
• CDN and compute partnerships
• Free egress allowance based on average stored data

Pricing

Backblaze B2 storage starts at:

• $6.95 per TB per 30 days
• The first 10 GB of storage is included

Customers receive free egress up to three times their average monthly storage. Egress above the allowance is generally billed at $0.01 per GB.

Backblaze also provides unlimited free egress to or through selected CDN and compute partners. Teams should verify the required routing and partner conditions before assuming all transfers are free.

See the official Backblaze B2 pricing page.

S3 Compatibility

Backblaze B2 supports many commonly used S3 operations, but it is not feature-identical to AWS S3.

Documented differences include limitations involving:

• IAM roles
• Object-level ACL behavior
• Object tagging
• Website configuration
• Browser-based POST uploads to presigned URLs

Common uploads, downloads, multipart transfers, and presigned URLs are supported, but applications that depend on unsupported features may require changes.

See the Backblaze B2 S3-Compatible API documentation.

Advantages

• Competitive storage pricing
• First 10 GB included
• S3-compatible API
• Egress allowance tied to stored volume
• Broad backup and NAS integrations
• Object Lock support
• Useful CDN partnerships

Trade-offs

• Not every S3 feature is available
• Egress above the allowance may be billed
• Fewer native cloud services than hyperscale platforms
• Complex AWS IAM assumptions may not translate directly
• Migration testing remains necessary

Potential Use Cases

• Business backups
• NAS backups
• Personal archives
• Media storage
• Ransomware-resistant backup copies
• CDN origins
• Software distribution

Object Lock can help protect backup copies from modification, but it needs to be part of a wider strategy. Attackers increasingly target backup credentials and retention settings, so organizations should also isolate administrative access and follow practices for protecting backup data from ransomware.

Who Should Consider It?

Backblaze B2 may suit teams that want affordable storage with established backup integrations. Applications relying on advanced IAM, tagging, ACL, or website behavior should complete a compatibility test first.

6. DigitalOcean Spaces

DigitalOcean Spaces is an S3-compatible object-storage service designed for developers and teams building applications on DigitalOcean.

Its bundled pricing can be easier to understand than a pricing model with separate charges for every storage and network dimension.

Key Features

• S3-compatible API
• Built-in CDN
• Multiple buckets under one subscription
• Presigned URLs
• Access keys
• CORS configuration
• Lifecycle rules
• Server-side encryption
• Private connectivity from eligible DigitalOcean resources
• Standard and Cold Storage
• Integration with DigitalOcean Droplets and Kubernetes

Standard Storage Pricing

A DigitalOcean Spaces Standard subscription costs $5 per month and includes:

• 250 GiB of storage
• 1,024 GiB of outbound transfer
• Multiple Spaces buckets under the subscription

Additional usage costs:

• $0.02 per GiB per month for additional storage
• $0.01 per GiB for additional outbound transfer

Inbound transfer does not count against the outbound allowance. The built-in CDN is included, although CDN and origin bandwidth share the transfer allowance.

Cold Storage Pricing

DigitalOcean Spaces Cold Storage is intended for infrequently accessed data.

Reference pricing includes:

• $0.007 per GiB per month for storage
• $0.01 per GiB retrieved
• A 30-day minimum storage duration
• Minimum billable object and retrieval sizes for small objects

Cold Storage may reduce the storage component of the bill, but retrieval and early-deletion behavior should be included in the estimate.

See the DigitalOcean Spaces pricing documentation.

Advantages

• Predictable entry-level package
• S3-compatible API
• Built-in CDN
• Straightforward integration with DigitalOcean
• 1,024 GiB of outbound transfer included
• Private traffic options for eligible resources
• Relatively simple developer experience

Trade-offs

• Additional Standard storage is not the lowest-priced option at large volumes
• Fewer regions and integrations than hyperscale providers
• The transfer allowance is shared across buckets
• Cold Storage introduces retrieval and minimum-duration considerations
• Advanced S3 behavior should be tested

Potential Use Cases

• Web application assets
• User uploads
• Images and video
• Software downloads
• DigitalOcean application backups
• CDN origins
• Small and medium-sized projects

Who Should Consider It?

DigitalOcean Spaces may be practical for developers already using DigitalOcean or teams that prefer a bundled monthly allowance. It may be less suitable for extremely large datasets or specialized enterprise requirements.

7. Cloudflare R2

Cloudflare R2 is an S3-compatible object-storage service designed to reduce the cost of serving data over the internet.

Its main distinction is that R2 does not charge for egress bandwidth from R2 itself. This makes it worth evaluating for software downloads, media, public assets, and other transfer-heavy workloads.

However, storage is not the only charge. R2 bills for Class A and Class B operations, and connected services may have their own costs.

Key Features

• S3-compatible API
• No R2 egress bandwidth charge
• Integration with Cloudflare Workers
• Custom domains
• Presigned URLs
• Multipart uploads
• Lifecycle rules
• Standard and Infrequent Access storage
• Event notifications
• Migration tools
• Integration with Cloudflare’s global network

Standard Storage Pricing

Cloudflare R2 Standard pricing includes:

• $0.015 per GB-month for storage
• $4.50 per million Class A operations
• $0.36 per million Class B operations
• No retrieval charge
• No R2 egress bandwidth charge

The monthly free allowance includes:

• 10 GB-months of storage
• 1 million Class A operations
• 10 million Class B operations
• Free R2 egress bandwidth

Class A operations generally include writes and state-changing operations. Class B operations generally include reads, such as GET and HEAD.

Infrequent Access Pricing

R2 Infrequent Access pricing includes:

• $0.01 per GB-month for storage
• $9 per million Class A operations
• $0.90 per million Class B operations
• $0.01 per GB retrieved
• A 30-day minimum storage duration
• No R2 egress bandwidth charge

Infrequent Access may reduce the storage rate for rarely read data, but frequent retrieval can make it more expensive than Standard storage.

See the Cloudflare R2 pricing documentation.

S3 Compatibility

Cloudflare R2 implements many common S3 operations, but some features, headers, and request behaviors differ.

Potential compatibility gaps include:

• ACL-related headers
• Object tagging
• Requester Pays
• Bucket-owner headers
• Some checksum modes
• Some Object Lock parameters
• AWS-specific account and policy assumptions

Cloudflare maintains an operation-level compatibility table. Review the Cloudflare R2 S3 API compatibility documentation before migrating production workloads.

Advantages

• No R2 egress bandwidth charge
• S3-compatible endpoint
• Useful for download-heavy workloads
• Integration with Cloudflare Workers and custom domains
• Monthly free allowance
• No minimum duration for Standard storage
• Lifecycle management support

Trade-offs

• Request-heavy applications can generate meaningful operation charges
• S3 compatibility is incomplete
• Connected services may have separate charges
• Infrequent Access includes retrieval charges
• Advanced S3 workflows require testing

Potential Use Cases

• Public downloads
• Media delivery
• Software distribution
• User-generated content
• CDN origins
• Cloudflare Workers applications
• Static application assets
• Egress-heavy data services

Who Should Consider It?

Cloudflare R2 may be a strong candidate when outbound bandwidth represents a large part of the current S3 bill. It is not automatically the least expensive option for applications issuing extremely high numbers of GET, PUT, or LIST requests.

8. Supabase Storage

Supabase Storage is an object-storage service integrated with the broader Supabase application platform.

Unlike a standalone hyperscale storage provider, it is designed to work closely with:

• Supabase Postgres
• Supabase Auth
• Row Level Security
• Generated APIs
• Edge Functions
• Realtime
• Smart CDN
• Image transformations

This integration can simplify applications that need user-aware file access without building a separate authorization service.

For a broader platform comparison, see Supabase vs. Firebase. Developers comparing managed application backends may also find the guide to Backend-as-a-Service providers useful.

Key Features

• Public and private buckets
• S3-compatible API
• REST API
• Standard uploads
• Resumable uploads
• Multipart S3 uploads
• Presigned URLs
• Postgres-based object metadata
• Row Level Security policies
• Supabase Auth integration
• CDN delivery
• Image transformations on eligible plans
• Large-file support on paid plans

One of its main advantages is the policy model. Developers can use Postgres Row Level Security to determine which authenticated users can upload, view, update, or delete specific objects.

Pricing

Supabase uses plan-based pricing rather than a standalone storage-only rate.

Free Plan

The Free plan includes:

• 1 GB of file storage
• 5 GB of uncached egress
• 5 GB of cached egress
• Basic CDN
• Plan-specific file-size and project limits

The Free plan is intended primarily for development, testing, and smaller projects. Teams should review inactivity, pausing, support, and usage policies before using it for production.

Pro and Team Plans

The Pro and Team plans include:

• 100 GB of file storage
• Additional storage at $0.0213 per GB per month
• 250 GB of uncached egress
• 250 GB of cached egress
• Uncached egress overage at $0.09 per GB
• Cached egress overage at $0.03 per GB

Storage usage is measured in GB-hours and averaged over the billing period.

The storage allowance is part of the broader Supabase subscription. Database compute, database disk, image transformations, custom domains, and other services may create separate charges.

See the official Supabase pricing page, Supabase storage usage documentation, and Supabase egress documentation.

S3 Compatibility

Supabase Storage supports the S3 protocol and AWS Signature Version 4. Developers can use many S3 clients to upload, list, retrieve, copy, and delete objects.

However, not every AWS S3 operation or header is implemented. Differences may involve:

• ACL headers
• Object Lock
• AWS KMS-specific encryption
• Requester Pays
• Bucket-owner headers
• Object tagging
• Some lifecycle functionality
• AWS-specific IAM behavior

Review the Supabase Storage S3 compatibility documentation.

Advantages

• Integrated with Supabase Auth
• Postgres Row Level Security for file access
• S3-compatible protocol for common operations
• Built-in CDN
• Useful for user-generated content
• REST and S3 access methods are interoperable
• Reduces the need for a separate file-authorization service
• Convenient for full-stack application development

Trade-offs

• Not a direct replacement for every S3 workload
• Pricing covers a broader application platform, not just storage
• Uncached egress overage can be significant
• S3 compatibility is incomplete
• Large archives may be less economical on Supabase
• Advanced replication, archive, and governance requirements may need another provider

Potential Use Cases

• User avatars
• Product images
• Private documents
• User-generated content
• SaaS file uploads
• Authenticated downloads
• Social and community applications
• Projects already using Supabase

Who Should Consider It?

Supabase Storage may be practical for developers who want storage, authentication, database policies, and APIs in one platform.

It is less likely to be the best choice for multi-petabyte archives, enterprise data lakes, or applications requiring the complete AWS S3 feature set.

Detailed Feature Comparison

What “S3-Compatible” Actually Means

“S3-compatible” usually means a provider supports enough of the S3 API for common operations such as:

• Creating buckets
• Uploading objects
• Downloading objects
• Listing objects
• Deleting objects
• Multipart uploads
• Presigned URLs
• Using common AWS SDKs or S3 clients

It does not mean every AWS feature is reproduced.

Compatibility can differ in areas such as:

• IAM roles
• Bucket policies
• ACLs
• Object tagging
• Object Lock
• Static website configuration
• Event notifications
• Replication
• Checksums
• Requester Pays
• AWS KMS integration
• Storage-class headers
• Lifecycle transitions

Before migrating, identify every S3 operation the application currently uses and test it against the target provider.

How to Choose the Right AWS S3 Alternative

1. Model the Complete Cost

Do not compare providers using storage price alone.

Include:

• Average stored volume
• Daily uploads
• Monthly downloads
• Public egress
• Read and write requests
• LIST operations
• Retrieval fees
• Minimum billing
• Minimum storage periods
• Early deletion
• Replication
• CDN usage
• Support plans
• Migration costs

A provider that charges more for storage may still be less expensive if it includes outbound transfer. A provider with no egress charge may become more expensive if request volume is extremely high.

2. Inventory the Required S3 Features

Document whether the application uses:

• Multipart uploads
• Presigned URLs
• Bucket policies
• Object tagging
• Versioning
• Object Lock
• Event notifications
• Lifecycle rules
• Static website configuration
• Cross-region replication
• Customer-managed encryption
• IAM roles

Simple PUT, GET, LIST, and DELETE workloads are generally easier to migrate than applications tightly coupled to AWS security and event systems.

3. Consider Where the Application Runs

Storage and compute placement affect latency and cost.

For example:

• Google Cloud applications may pair naturally with Google Cloud Storage.
• Azure applications may benefit from Azure Blob Storage.
• DigitalOcean applications may benefit from private Spaces traffic.
• Cloudflare Workers can integrate closely with R2.
• Supabase applications can combine Storage with Auth and Row Level Security.

4. Check Region and Data-Residency Requirements

Confirm that the provider offers a suitable location for:

• Application latency
• Data residency
• Contractual requirements
• Disaster recovery
• Regulatory requirements
• Customer expectations

A lower price may not compensate for an unsuitable region or an architecture that transfers every object across continents.

5. Evaluate Security Controls

At a minimum, examine:

• Encryption in transit
• Encryption at rest
• Customer-managed keys
• Multi-factor authentication
• Access policies
• Private endpoints
• Audit logs
• Object immutability
• Versioning
• Key rotation
• Presigned URL behavior
• Public-access prevention

Misconfigured buckets remain a major source of exposure. Organizations should define least-privilege policies, monitor configuration changes, and follow practices for preventing public-cloud data leakage.

For sensitive environments, storage controls should also form part of a broader data loss prevention strategy.

6. Test Performance With Real Files

Performance depends on:

• Region
• Network path
• Object size
• Concurrency
• Multipart configuration
• Client location
• SDK behavior
• Retry strategy
• CDN configuration

Test using actual object sizes and expected traffic patterns. A generic benchmark from another region may not represent production performance.

7. Plan the Migration

A migration plan should include:

• Initial bulk transfer
• Incremental synchronization
• Metadata conversion
• Permission conversion
• Object version history
• Checksums
• Application endpoint changes
• CDN or DNS changes
• Rollback
• Source-provider egress charges
• Validation before source deletion

Treat the work as a formal data migration project rather than a simple copy operation.

Do not delete the source data immediately after transfer. Validate object counts, sizes, checksums, metadata, versions, permissions, and application behavior first.

8. Design for Backup and Recovery

Cloud object storage is not automatically immune to ransomware or accidental deletion. Compromised credentials may allow attackers to encrypt, replace, or delete cloud-hosted objects. Synchronized encrypted files can also overwrite clean copies.

Review how ransomware can affect cloud storage and consider:

• Versioning
• Object Lock
• Separate administrative credentials
• Multi-factor authentication
• Immutable copies
• Cross-account backups
• Offline or air-gapped copies
• Restore testing
• Alerting for mass deletion
• Recovery runbooks

A backup should not be considered reliable until it has been restored successfully in a controlled test.

Recommendations by Use Case

For AWS-Centric Applications

Consider staying with Amazon S3.

S3 may remain the most practical option when an application depends on AWS IAM, Lambda events, CloudFront, Athena, Lake Formation, or other AWS-native services. A lower storage price elsewhere may not offset migration and integration costs.

For Google Cloud Analytics and AI

Consider Google Cloud Storage.

It may fit workloads centered on BigQuery, Dataflow, Dataproc, and Vertex AI. Select the bucket location and storage class based on the workload rather than assuming multi-region storage is always necessary.

For Microsoft and Azure Environments

Consider Azure Blob Storage.

It may be a natural choice for Azure-hosted applications, Microsoft identity, and Azure data services. Plan for migration work because Azure Blob Storage does not natively implement the S3 API.

For IBM and Hybrid-Cloud Environments

Consider IBM Cloud Object Storage.

It may suit organizations using IBM Cloud, Aspera, IBM security services, or hybrid-cloud architecture. Use IBM’s pricing tools because operations, retrieval, and bandwidth can affect the total.

For Long-Lived Backups

Consider Wasabi or Backblaze B2.

Wasabi may be easier to estimate when data remains stored for at least 90 days and the account uses one terabyte or more. Backblaze B2 may suit smaller repositories, NAS backups, or workflows that benefit from its egress allowance and integrations.

For DigitalOcean Applications

Consider DigitalOcean Spaces.

The $5 package may work well for web assets, uploads, and application files. It is particularly relevant when the compute layer already runs on DigitalOcean.

For Egress-Heavy Content

Consider Cloudflare R2.

R2 may reduce the outbound-transfer portion of the bill. Model Class A and Class B operations before deciding, especially for applications serving many small objects.

For Supabase Applications

Consider Supabase Storage.

It can simplify file authorization when the application already uses Supabase Postgres and Auth. Row Level Security is particularly useful for user-owned and tenant-specific files.

Frequently Asked Questions

Is There a Cheaper Alternative to AWS S3?

Potentially, but there is no universally cheapest option.

Wasabi and Backblaze B2 have lower listed storage rates than S3 Standard. Cloudflare R2 does not charge for R2 egress bandwidth, while DigitalOcean Spaces includes a transfer allowance.

The actual result depends on:

• Storage volume
• Request count
• Outbound transfer
• Retention period
• File size
• Retrieval frequency
• Minimum billing
• Region

Which AWS S3 Alternative Has No Egress Fees?

Cloudflare R2 does not charge for egress bandwidth from R2 itself, although connected services may have their own charges.

Wasabi does not apply a separate egress charge within its applicable policy. Backblaze B2 includes free egress up to three times average monthly storage and provides different terms through selected partners.

Review current provider terms before assuming every transfer path is free.

Do All These Providers Support the S3 API?

No.

• Wasabi, Backblaze B2, DigitalOcean Spaces, IBM Cloud Object Storage, Cloudflare R2, and Supabase Storage provide S3-compatible interfaces.
• Google Cloud Storage supports some S3 tools through its XML API and HMAC authentication.
• Azure Blob Storage does not natively implement the S3 API.

Even among compatible providers, individual operations and headers differ.

Is Supabase Storage a Direct Replacement for Amazon S3?

Not for every scenario.

Supabase Storage is particularly useful for application files that need Supabase Auth, Postgres policies, and Row Level Security. It supports common S3 operations but does not reproduce the complete S3 feature set.

Large data lakes, long-term archives, or advanced enterprise storage architectures may be better served by a dedicated object-storage platform.

Is Cloudflare R2 Always Cheaper Than Amazon S3?

Not necessarily.

R2 can reduce the egress component of the bill, but it charges for Class A and Class B operations. An application generating extremely high request volume should model those charges.

Which Alternative Is Best for Backups?

Wasabi and Backblaze B2 are commonly evaluated for backups, but the better fit depends on retention and recovery patterns.

Wasabi may suit stable repositories where objects remain for the minimum period. Backblaze B2 may suit smaller volumes, NAS backups, and workloads that benefit from its egress allowance.

Also compare Object Lock, encryption, access isolation, audit logs, and restore performance.

Which Alternative Is Best for Data Analytics?

Google Cloud Storage may be practical for BigQuery, Dataflow, Dataproc, and Vertex AI workloads.

Azure Blob Storage is relevant for Azure data services, while IBM Cloud Object Storage may fit IBM analytics environments. The best option is usually the service located near the compute and analytics layer.

Which Alternative Is Easiest for a Small Development Team?

DigitalOcean Spaces can be straightforward for teams already using DigitalOcean. Supabase Storage may be easier for applications built around Supabase Auth and Postgres.

Backblaze B2 may also provide a relatively short setup path for backup and general storage. The actual learning curve depends on permissions, SDK requirements, deployment workflows, and security controls.

Can These Services Host a Static Website?

Many can store and serve static assets, but direct static website functionality varies.

A common architecture uses object storage as the origin and serves files through a CDN or application layer. Do not assume that every S3-compatible provider implements the S3 website configuration API.

Can I Move From S3 Without Changing My Application?

Sometimes, but not always.

Applications using standard PUT, GET, LIST, DELETE, and multipart operations may only need:

• A new endpoint
• New access keys
• A different region value
• Minor SDK configuration changes

Applications using AWS IAM roles, Object Lock, event notifications, bucket policies, KMS, tagging, or website configuration may require additional engineering.

Should I Keep a Copy in AWS During Migration?

Usually, yes—at least temporarily.

Maintain the source copy until you have verified:

• Object count
• Total data size
• Checksums
• Metadata
• Permissions
• Version history
• Lifecycle behavior
• Application access
• Restore procedures

A staged migration is generally safer than an immediate cutover followed by source deletion.

Final Verdict

Amazon S3 remains a mature and feature-rich object-storage platform, particularly for applications already operating within AWS. Its alternatives are not simply cheaper copies of the same service. Each makes different trade-offs involving egress, request pricing, retention, API compatibility, regional coverage, and ecosystem integration.

A practical shortlist can be summarized as follows:

• Google Cloud Storage: Worth considering for Google Cloud analytics, AI, and application workloads.
• Azure Blob Storage: A natural candidate for Azure environments, but not a native S3 endpoint.
• IBM Cloud Object Storage: Relevant for IBM Cloud, enterprise, and hybrid-cloud use cases.
• Wasabi: Potentially cost-effective for stable datasets stored at one-terabyte scale or above.
• Backblaze B2: Suitable for backup, NAS, media, and cost-conscious object storage.
• DigitalOcean Spaces: Straightforward for applications already running on DigitalOcean.
• Cloudflare R2: Particularly relevant when outbound transfer is a major cost.
• Supabase Storage: Useful for application files that need integrated authentication and database-driven authorization.

Before choosing a provider, model a realistic month of storage, requests, retrieval, transfer, and retention. Then run a proof of concept using the application’s actual object sizes, SDK calls, permissions, and access patterns.

The lowest advertised storage rate is not always the lowest total cost, and the provider with the broadest feature set is not always the easiest one to operate.

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