SeaweedFS vs Cloudflare R2
Both are alternatives to Amazon S3. Here's how they stack up — verified facts, no spin.
Also searched as Cloudflare R2 vs SeaweedFS — same comparison, one verdict.
SeaweedFS is open source (Apache-2.0) and Cloudflare R2 is not (Proprietary (hosted service)) — so the real question is whether you want to own the object storage stack or rent it.
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.
Cloudflare R2
S3-compatible with zero egress fees — the direct answer to the complaint.
R2 is Cloudflare's object store and its defining feature is a deliberate attack on S3's pricing: storage around $0.015 per GB per month and no egress charges whatsoever. For anything read frequently over the internet — media, assets, public datasets — that single difference can turn a four-figure monthly bill into a two-figure one. It is S3-API compatible, so migration is largely a config change. It is proprietary and hosted, which is the honest trade, and it makes Cloudflare rather than Amazon the party you depend on.
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.
| SeaweedFS | Cloudflare R2 | |
|---|---|---|
| Sovereignty ScoreOur transparent 0–100 composite for data ownership and exit cost. | 93 | 40 |
| Open source | Yes | No |
| Self-hostable | Yes | No |
| Local-first data | Yes | No |
| License | Apache-2.0 | Proprietary (hosted service) |
| Pricing | Free and open source. You supply the hardware. | About $0.015/GB/month storage. No egress charges. Free tier included. Checked 2026-08-04. |
| RAM to run it wellThe figure that actually matters, not the vendor's minimum. | 4 GB across master and volume servers | — |
| Realistic running costWhat the box costs each month if you run it yourself. | $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. | Half a day | — |
| Ongoing maintenanceThe part nobody budgets for. | Moderate. Volume management and replication settings are yours. | — |
SeaweedFS edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
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
Cloudflare R2
Strengths
- +Zero egress fees — the single biggest cost difference in this category
- +S3-compatible API, so migration is mostly configuration
- +Cheaper storage than S3 as well
- +Integrates with Cloudflare Workers and the CDN
Trade-offs
- −Proprietary and hosted — you have swapped one vendor for another
- −Fewer surrounding services than S3's ecosystem
- −No deep-archive tier comparable to Glacier
- −Ties you into Cloudflare's platform decisions
Which one fits you
The trade-offs above, turned into a decision. Find the line that describes your team.
Choose SeaweedFS
if you want the source and the option to fork it, and you would rather run it on your own hardware, and your data should stay on machines you control.
Choose Cloudflare R2
if zero egress fees — the single biggest cost difference in this category.
Neither, yet
if both carry a real cost you should weigh first — smaller community and fewer worked examples than MinIO, and proprietary and hosted — you have swapped one vendor for another. 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.
SeaweedFS vs Cloudflare R2 — common questions
Is SeaweedFS a better fit than Cloudflare R2 for object storage?
It depends on what you are optimising for, and the honest split is this: SeaweedFS scores 93 to Cloudflare R2's 40 on data ownership and exit cost, so it is the safer choice if you care about being able to leave. Cloudflare R2 earns its place on a different axis — zero egress fees — the single biggest cost difference in this category. Neither is a wrong answer for every team; the table above is the actual comparison.
What happens if we want to switch later?
SeaweedFS keeps its data local or in open formats, so leaving is an export rather than a negotiation. Cloudflare R2 keeps your data on its own infrastructure, which is the part to plan for: confirm the export path before you commit, not when you are already trying to leave.
Can I self-host SeaweedFS?
SeaweedFS can be self-hosted; Cloudflare R2 cannot, so it stays on the vendor's infrastructure whatever you do.
Are SeaweedFS and Cloudflare R2 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.