Open Source Alternatives
Open Source Cloud Storage Alternatives to Amazon S3
Object cloud storage service from Amazon.
Amazon S3 is a trademark of its respective owner.
Updated Nov 2026
What you gain
- ✓No per-GB storage pricing and data transfer egress fees
- ✓Full control over storage infrastructure without AWS dependency
- ✓No data egress costs that penalize serving files to users
- ✓Self-hosted storage with S3-compatible API (RustFS, SeaweedFS, Garage)
What you give up
- △No 99.999999999% (11 nines) durability guarantee
- △No S3 Intelligent-Tiering for automatic cost optimization
- △No native integration with Lambda, CloudFront, and 200+ AWS services
- △No managed lifecycle policies for automatic archival and deletion
Switching Cost
S3's lock-in is the API ecosystem. The S3 API is a de facto standard, so switching to RustFS, SeaweedFS, or Ceph means your code barely changes. The data itself is just files. But the deep AWS integrations (Lambda triggers, CloudFront origins, IAM policies, lifecycle rules) need rebuilding. Small apps with a few buckets can migrate in a day using rclone. Teams with terabytes of data and complex cross-service integrations should budget 1-2 weeks for the migration and significantly longer for the data transfer itself. The hidden cost is egress: AWS charges you to leave, and large data transfers can cost thousands.
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Drop-in Replacements
Ranked by feature coverage
RustFS
8875% coverageRustFS is S3-compatible object storage you run yourself, written in Rust and licensed Apache 2.0. It does erasure coding, distributed pools, versioning, object lock, KMS-backed encryption, replication, lifecycle rules, IAM and OIDC, with a web console.
SeaweedFS
8870% coverageDistributed storage for S3 and file systems
SeaweedFS is self-hosted storage for a lot of files: one Go binary serving an S3-compatible object store, a mountable filesystem and an Iceberg lakehouse from the same data. Its edge over Ceph and RustFS is small files: each one is a single disk read, so a hundred million thumbnails stay fast.
Garage
6655% coverage(Mirror) S3-compatible object store for small self-hosted geo-distributed deployments. Main repo: https://git.deuxfleurs.fr/Deuxfleurs/garage
Garage is S3-compatible object storage built for small clusters of cheap, mismatched machines instead of enterprise hardware. Point your existing S3 tooling at it, replicate across three nodes in different locations, and it keeps serving through failures.
Building Blocks
Amazon S3 is a platform. It bundles multiple capabilities into one subscription. These tools each cover one piece. Teams often assemble 2–3 of them instead of paying for the full suite.