S3 Compatible Cloud Object Storage Benchmark

I have been using Amazon S3 for over a decade. I benchmarked leading S3-compatible object storage providers across nine criteria: ease of migration, data transfer fees, storage costs, retrieval times, mountability, static web hosting, and more.

AWS dominates the public cloud market, and S3 is its most widely used storage service. As its adoption grew, competing providers built S3-compatible alternatives, giving teams more options while preserving compatibility with existing tooling.

We divided S3-compatible storage solutions into two main categories:

1. Cloud Providers (Managed Object Storage Services) for fully managed storage services provided by cloud companies, eliminating the need for self-hosted infrastructure.
2. Software-based Solutions (Self-Hosted / On-Premises / Private Cloud) to deploy the object storage software on your own infrastructure.

S3 Compatible Cloud Object Storage Providers

** Reviews are based on Capterra and G2. Vendors are ranked based on their number of reviews.

** Free trial period is included if it is publicly shared.

Price comparison for S3 Compatible Cloud Object Storage Providers

Differentiating features of providers

*​Mounting Cloudflare R2 storage using S3FS has presented challenges for some users. Despite R2’s compatibility with the S3 API, there have been reports of difficulties when attempting to mount R2 buckets with S3FS.

**​In Cloudflare R2, Class A and Class B operations categorize different types of actions performed on stored data. (Class A Operations. e.g., PUT, POST, and Class B Operations, e.g., GET)

***Inbound Data Transfer is free for all storages, allowing users to upload data without incurring additional costs.

****Retrieval time varies based on the cluster setup, depending on factors like network speed, hardware, and storage architecture.

Top S3-compatible cloud object storage solutions analyzed

Cloudflare R2

Cloudflare R2 eliminates egress fees entirely no charge for data transferred out of the platform. This makes it the most cost-predictable option for applications with high outbound transfer volumes. R2 also supports static web hosting and benefits from Cloudflare’s global network for fast retrieval.

The main limitation is S3FS mounting. R2’s S3 API compatibility works well with most tooling, but direct mounting via S3FS is unreliable for some users. The recommended workaround is rclone. R2 is also not designed for cold storage; it is priced and optimized for frequently accessed data.

Pros:

• No egress fees
• Fast global retrieval via Cloudflare’s network
• S3-compatible API
• Supports static web hosting

 Cons:

• S3FS mounting requires workarounds (use rclone instead)
• No cold or archive storage tier
• Less configuration flexibility than self-hosted options

Hetzner provides S3-compatible object storage built on Ceph, aimed primarily at European customers. It supports both S3FS and rclone mounting, has a predictable flat-cost structure with no hidden operation fees, and scales from personal to enterprise workloads.

The trade-off is geographic coverage: Hetzner’s data centers are concentrated in Europe, which adds latency for users in other regions. It also lacks a built-in CDN, so global content delivery requires an external service.

Pros:

• Ceph-based with managed support
• Supports S3FS and rclone mounting
• Flat pricing with no operation surcharges

Cons:

• Limited to European data center locations
• No built-in CDN
• Retrieval performance depends on Ceph cluster configuration

DigitalOcean Spaces is a straightforward managed object storage service with a built-in CDN and native integration into DigitalOcean’s broader cloud platform. It is well-suited for teams already using DigitalOcean for compute or databases.

Pricing includes 1 TB of free outbound transfer per month, sufficient for low- to moderate-workload use. After that threshold, egress is charged per GB. Some users report slower retrieval for small objects.

Pros:

• Fully managed
• Built-in CDN for global content delivery
• 1 TB free outbound transfer per month
• S3-compatible API

Cons:

• Egress charges above 1 TB
• Slower retrieval reported for small files
• Limited performance tuning options

Backblaze B2 provides flat-rate object storage with flexible file versioning and broad third-party integration support. All stored data is immediately accessible there is no archive or cold storage tier.

B2 operates data centers primarily in North America. Users outside the US and EU may experience higher latency. SDK support across programming languages is more limited than AWS S3, which can complicate integration for some development workflows.

Pros:

• Flat, predictable pricing
• Flexible file versioning
• Wide third-party integration support (Veeam, Cloudflare, Fastly, etc.)

Cons:

• Data centers are concentrated in North America
• SDK coverage is narrower than AWS S3

Scaleway offers a three-tier storage model: Standard, Infrequent Access (IA), and Glacier (cold storage). This tiering provides meaningful cost control data that is rarely accessed can sit in Glacier at a lower per-GB cost, with retrieval times measured in hours rather than milliseconds.

Scaleway operates across European availability zones and offers free intra-region data transfers. It supports S3-compatible tooling and static web hosting. Some users have reported occasional slowness on the standard tier, and baseline security features took longer than expected to reach parity with other providers.

Pros:

• Three storage tiers covering standard, infrequent, and cold access
• Free intra-region transfers
• Supports static web hosting natively
• S3-compatible API

Cons:

• Occasional slowness on the standard tier is reported by users
• Security features lagged behind competitors at launch

S3-Compatible Software-based Solutions

** Reviews are based on Capterra and G2. Vendors are ranked based on their number of reviews.

*** Free trial period is included if it is publicly shared.

Ceph

Ceph is an open-source distributed storage platform supporting object, block, and file storage in a single system. It is designed for fault tolerance and horizontal scalability, adding nodes increases capacity without reconfiguring the cluster.

Because you deploy and operate Ceph yourself, it offers complete control over performance tuning, data placement, and cost. That same control comes with complexity: setting up and maintaining a Ceph cluster requires experienced infrastructure engineers. Retrieval performance depends heavily on your hardware and network configuration.

Pros:

• Handles object, block, and file storage in one system
• Scales horizontally without disruption
• No vendor lock-in deploy anywhere
• Fully configurable

Cons:

• Requires self-management and ongoing maintenance
• Complex initial setup
• Performance is unpredictable without proper hardware
• No built-in CDN

MinIO

MinIO is a high-performance open-source object storage server built for cloud-native workloads. It runs on Docker, Kubernetes, and bare-metal, and is widely used in AI/ML pipelines, big-data analytics, and hybrid-cloud environments. MinIO’s S3 API compatibility allows complete applications built for AWS S3 to work against MinIO without code changes.

MinIO is the most deployment-flexible option in this comparison: it can run on a single laptop for development or scale to a distributed multi-node cluster in production. Enterprise features (erasure coding, encryption, multi-tenancy, enterprise support) are available under a commercial license.

Pros:

• Full S3 API compatibility
• Runs on Docker, Kubernetes, or bare metal with minimal configuration
• High throughput on NVMe and SSD storage
• Active open-source community

Cons:

• Multi-region replication requires additional setup
• Limited built-in analytics
• Not designed for extreme-scale distributed deployments that need Ceph-level flexibility

OpenIO

OpenIO is an open-source distributed object storage system optimized for high-throughput workloads, including AI/ML data pipelines and large-scale analytics. It supports S3 API compatibility and can be deployed on-premises or in hybrid environments.

Pros:

• Optimized for fast object retrieval and event-driven workloads
• Supports on-premises and hybrid deployments

Cons:

• Performance depends on hardware and network configuration
• Some advanced S3 features require manual configuration

Differentiating Features of S3 Compatible Cloud Storage

Egress fees

Egress fees are the highest hidden cost in object storage. Most providers charge per GB of data transferred out costs that accumulate quickly for media platforms, analytics pipelines, or frequent backup restoration.

• Cloudflare R2: No egress fees
• Backblaze B2: Free egress when paired with Cloudflare CDN; otherwise, standard rates
• DigitalOcean Spaces: 1 TB free per month, then charged per GB
• Hetzner, Scaleway: Standard egress rates apply
• Self-hosted (Ceph, MinIO, OpenIO): Egress costs depend on your network and hosting provider

Retrieval time

Real-time retrieval is straightforward on standard storage tiers across all providers. The relevant distinction is for archival tiers:

• Cloudflare R2, DigitalOcean, Backblaze B2, Hetzner, MinIO: Near-instant retrieval on standard tiers
• Scaleway Glacier: Retrieval measured in hours
• Ceph / OpenIO: Retrieval time depends on cluster hardware and network setup

Static web hosting

Most providers support serving static files directly from object storage. Scaleway is the only provider in this comparison that supports static web hosting natively across all tiers, including cold storage. Cloudflare R2 and DigitalOcean Spaces also support static hosting with CDN integration. Hetzner supports it with some additional configuration.

Mountable storage (S3FS)

Mounting object storage as a local filesystem is useful for applications that expect POSIX-style file access:

• Hetzner, DigitalOcean, MinIO: Full S3FS and rclone support
• Cloudflare R2: rclone supported; S3FS mounting is unreliable for some configurations
• Ceph: Mountable via S3-compatible tools with a more complex setup

Migration

All providers listed use the S3 API, meaning existing S3-based application code works without modification. The primary migration effort is data transfer, not reconfiguration. DigitalOcean’s tight integration with its own cloud platform makes it the lowest-friction option for teams already in that ecosystem. Ceph and OpenIO require more planning for large-scale migrations due to setup complexity.

How to Choose

If egress costs are your primary concern, Cloudflare R2 eliminates them. For teams that transfer large volumes of data out of media delivery, analytics exports, backup restoration, this is the most important differentiator.

If you need tiered storage for cost management, Scaleway is the only provider here with a cold storage tier (Glacier). If a significant portion of your data is rarely accessed, tiered pricing substantially reduces monthly costs.

If you’re already in DigitalOcean’s ecosystem, Spaces is the simplest option. The built-in CDN and native integration mean less configuration overhead.

If you need to run storage on your own infrastructure, MinIO is the most practical starting point for most teams. It deploys quickly, is fully S3 API-compatible, and performs well on commodity hardware. Ceph is the right choice for large-scale distributed storage where you need fine-grained control over data placement and redundancy. OpenIO is worth evaluating if your workload is AI/ML or event-driven data processing.

If you serve European customers: Hetzner and Scaleway both operate European data centers with free intra-region transfer, which matters for latency and data residency compliance.

Why Are the Differentiating Features Important?

S3-Compatible object storage providers may share a common API standard, but their unique features define their efficiency, scalability, and cost-effectiveness. These differentiating factors help businesses and individuals make informed decisions based on their specific storage, retrieval, and integration needs.

1. Cost Optimization

Pricing structures for object storage are more complex than just per-terabyte pricing. Many S3-compatible object storage providers charge additional fees for data retrieval, API requests, and outbound data transfers (e.g., egress fees). Without clear pricing models, businesses may face unexpected costs, particularly if they frequently move data across multiple cloud services or require large-scale backups.

• Predictable pricing models reduce financial uncertainty, allowing better long-term budget planning.
• Egress fees can significantly impact businesses that need to retrieve large amounts of data regularly, such as media companies streaming high-resolution video or organizations running frequent backups.
• Multi-tier storage models balance performance and cost by allowing less frequently accessed data to be stored at lower prices. However, retrieval fees and access times vary, making it essential to align storage selection with usage patterns.

2. Performance & Data Accessibility

S3-compatible object storage is commonly used for applications that require on-demand data access, such as AI/ML workloads, content delivery networks (CDNs), cloud backups, and big data analytics. The efficiency of a storage provider is measured by:

• Data consistency and replication: Applications that require high reliability should seek strong consistency guarantees to avoid data conflicts when multiple users or applications access duplicate files.
• Retrieval time (latency): Some providers offer instant data access, while others use tiered storage models where data retrieval can take minutes or even hours. Businesses requiring real-time data access (e.g., AI-driven analytics or cloud applications) should prioritize low-latency storage.
• Storage redundancy: Data is often distributed across multiple availability zones to enhance reliability and minimize downtime risks. Providers offering multi-zone redundancy improve data durability but may have higher costs.

3. Scalability & Integration

As data needs grow, scalability becomes critical. Object storage solutions should allow businesses to expand capacity without disruptions while remaining compatible with existing applications.

• Integration with cloud-native applications: Many organizations rely on cloud-based AI models, machine learning pipelines, or SaaS applications. S3-compatible object storage providers seamlessly integrate with cloud platforms, enabling smooth workflows without requiring major infrastructure changes.
• Multi-cloud compatibility: Some businesses prefer distributing data across multiple cloud providers to avoid vendor lock-in. Object storage solutions that support multi-cloud environments give organizations greater flexibility.
• Mountable storage (S3 Fusing): Some S3-compatible object storage solutions can be mounted as a virtual drive, allowing applications to access data like a local file system.

4. Migration & Ease of Use

Seamlessly migrating data between storage providers without downtime is essential for businesses aiming to optimize costs, improve security, or scale their operations.

• S3 API compatibility ensures that businesses can switch between providers with minimal changes to their codebase. This compatibility is crucial for organizations that use AWS S3-based applications but want to explore alternative providers to reduce costs or meet regulatory compliance requirements.
• Automated migration tools reduce complexity when transferring large datasets across cloud environments. Features like data synchronization, cross-region replication, and automated backups help businesses manage transitions without operational disruptions.
• User-friendly management consoles and intuitive APIs simplify administration, reducing the need for extensive technical expertise. Organizations with smaller IT teams benefit from providers that offer simple deployment processes and well-documented APIs.

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Sedat is a technology and information security leader with experience in software development, web data collection and cybersecurity. Sedat:
- Has ⁠20 years of experience as a white-hat hacker and development guru, with extensive expertise in programming languages and server architectures.
- Is an advisor to C-level executives and board members of corporations with high-traffic and mission-critical technology operations like payment infrastructure.
- ⁠Has extensive business acumen alongside his technical expertise.

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