head to head · open source
one-api vs oasdiff
one-api has 36,963 GitHub stars, 6,868 forks, 1,036 open issues and last shipped 8 months ago. oasdiff has 1,371 stars, 107 forks, 50 open issues and last shipped 2 days ago. one-api leads on adoption by 2,596% (36,963 vs 1,371 stars). one-api is written in JavaScript under MIT; oasdiff is written in Go under Apache-2.0. one-api has attracted 19% as many forks as stars, oasdiff 8%. oasdiff was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| one-api | oasdiff | |
|---|---|---|
| GitHub stars | ★ 37K | ★ 1.4K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Go |
| Last push | 2026-01-09 | 2026-09-18 |
| Forks | ⑂ 6.9K | ⑂ 107 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick one-api if
- You weight community size — 37K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick oasdiff if
- You want the oasdiff feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and oasdiff fits your workflow better
About one-api
One API is a self hosted LLM API management and key redistribution system that exposes many model providers through the standard OpenAI API format, aimed at developers, teams and operators who want a single endpoint, a single key model and a single quota surface across providers.
read the full one-api overview →
About oasdiff
oasdiff is a Go based, Apache 2.0 command line tool that compares OpenAPI specifications and detects breaking changes, built for API engineers and platform teams who need to know whether a spec edit will break existing API clients before it ships.
read the full oasdiff overview →
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Frequently asked questions
Is one-api or oasdiff more popular?
one-api has 36,963 GitHub stars and oasdiff has 1,371. one-api has the larger community by that measure.
Are one-api and oasdiff free?
Both are open source. one-api is licensed under MIT and oasdiff under Apache-2.0. Neither carries a licence fee.
What is the difference between one-api and oasdiff?
one-api is written in JavaScript and oasdiff in Go. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, one-api or oasdiff?
Choose one-api if you want the larger community (36,963 stars) or its MIT licence terms. Choose oasdiff if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.