MinIO vs SeaweedFS
Both are alternatives to Amazon S3. Here's how they stack up — verified facts, no spin.
Also searched as SeaweedFS vs MinIO — same comparison, one verdict.
MinIO and SeaweedFS are closely matched on ownership (92 vs 93) — this one comes down to pricing and to which trade-offs below you can live with.
MinIO
TOP PICKThe S3 API on your own hardware — same calls, no egress bill.
MinIO is a high-performance object server that speaks the S3 API closely enough that most applications need only a changed endpoint. Run it on a spare machine, a rack, or across a cluster; it handles erasure coding, versioning and encryption. AGPL-3.0, around 61k stars. For anyone whose objection to S3 is the egress bill rather than the storage price, this removes it entirely — the data is on hardware you already pay for. AGPL is the caveat: read it before you embed MinIO in a product you distribute.
SeaweedFS
Built for billions of small files, where most object stores struggle.
SeaweedFS is a distributed file and object store designed around a specific weakness in the others: enormous numbers of small files. Its architecture keeps metadata lookups fast where conventional object stores slow down, which makes it a strong fit for image, thumbnail and document workloads at scale. Apache-2.0, around 34k stars, with an S3-compatible gateway and tiered storage to cloud back-ends. It is less known than MinIO and that is the main caution — fewer worked examples when something goes wrong.
Side by side
10 points of comparison, every one read from a verified field. Green marks the side that wins a row outright. A dash means we do not hold that fact — never that it is zero.
| MinIO | SeaweedFS | |
|---|---|---|
| Sovereignty ScoreOur transparent 0–100 composite for data ownership and exit cost. | 92 | 93 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first data | Yes | Yes |
| License | AGPL-3.0 | Apache-2.0 |
| Pricing | Free and open source. Commercial licence and support available from MinIO Inc. | Free and open source. You supply the hardware. |
| RAM to run it wellThe figure that actually matters, not the vendor's minimum. | 4 GB | 4 GB across master and volume servers |
| Realistic running costWhat the box costs each month if you run it yourself. | $15–40/mo for a few TB on block storage, against S3 pricing that is cheaper per GB but charges for every request and every byte out | $20–50/mo for a few TB, against S3 pricing that is cheaper per GB but charges per request and per byte out |
| Setup timeHonest first-install estimate, not the marketing quickstart. | 1 hour single-node, a day for a distributed set | Half a day |
| Ongoing maintenanceThe part nobody budgets for. | Moderate. Drive failures are your problem now, and so is capacity planning. | Moderate. Volume management and replication settings are yours. |
MinIO is Macrostack's recommended Amazon S3 alternative, so it's our pick here.
MinIO
Strengths
- +S3-compatible API — most applications need one endpoint changed
- +No egress charges at all, because the data never leaves your network
- +Genuinely fast; used for high-throughput analytics workloads
- +Erasure coding, versioning and encryption built in
Trade-offs
- −AGPL-3.0 needs reading if you distribute a product containing it
- −You own durability now — replication and backups are your design
- −No Glacier equivalent for cheap cold archive
- −Recent licensing and feature changes have unsettled some users
SeaweedFS
Strengths
- +Handles billions of small files where other object stores degrade
- +Apache-2.0 — more permissive than MinIO's AGPL
- +S3-compatible gateway plus a real filesystem interface
- +Tiered storage to cloud back-ends for cold data
Trade-offs
- −Smaller community and fewer worked examples than MinIO
- −More moving parts — master, volume and filer servers
- −Documentation is thinner
- −Less battle-tested at enterprise scale
Which one fits you
The trade-offs above, turned into a decision. Find the line that describes your team.
Choose MinIO
if s3-compatible API — most applications need one endpoint changed.
Choose SeaweedFS
if a lower exit cost matters more to you than any single feature, and handles billions of small files where other object stores degrade.
Neither, yet
if both carry a real cost you should weigh first — aGPL-3.0 needs reading if you distribute a product containing it, and smaller community and fewer worked examples than MinIO. If either of those is a dealbreaker for your team, the shortlist is wrong rather than the choice.
What it takes to run these yourself
Real requirements and honest running costs, not the vendor quickstart.
Self-hosting MinIO
4 GB RAM · 1 hour single-node, a day for a distributed set
$15–40/mo for a few TB on block storage, against S3 pricing that is cheaper per GB but charges for every request and every byte out
Self-hosting SeaweedFS
4 GB across master and volume servers RAM · Half a day
$20–50/mo for a few TB, against S3 pricing that is cheaper per GB but charges per request and per byte out
MinIO vs SeaweedFS — common questions
Is MinIO a better fit than SeaweedFS for object storage?
It depends on what you are optimising for, and the honest split is this: SeaweedFS scores 93 to MinIO's 92 on data ownership and exit cost, so it is the safer choice if you care about being able to leave. MinIO earns its place on a different axis — s3-compatible API — most applications need one endpoint changed. Neither is a wrong answer for every team; the table above is the actual comparison.
What happens if we want to switch later?
MinIO keeps its data local or in open formats, so leaving is an export rather than a negotiation. SeaweedFS is still self-hostable, so the files stay on your server either way — but it is not local-first by design, so check what its export produces before you rely on it.
Can I self-host MinIO or SeaweedFS?
Both can be self-hosted. The difference is what it costs you in time rather than whether it is possible — see the setup and maintenance rows above.
Are MinIO and SeaweedFS both alternatives to Amazon S3?
Yes — both appear in our Amazon S3 comparison, which is why they are worth putting side by side. People usually arrive here already having decided to move off Amazon S3 and now choosing between the two replacements, which is a narrower and much easier question.
Related alternative guides
Facts verified 2026-08-04. Licenses and pricing change — spotted something out of date? That's a correction we want.