head to head · open source
one-api vs schemathesis
one-api has 36,932 GitHub stars, 6,867 forks, 1,036 open issues and last shipped 8 months ago. schemathesis has 3,608 stars, 224 forks, 7 open issues and last shipped yesterday. one-api leads on adoption by 924% (36,932 vs 3,608 stars). one-api is written in JavaScript under MIT; schemathesis is written in Python under MIT. one-api has attracted 19% as many forks as stars, schemathesis 6%. schemathesis was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (api), so they are genuine substitutes rather than adjacent tools.
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 | schemathesis | |
|---|---|---|
| GitHub stars | ★ 37K | ★ 3.6K |
| License | MIT | MIT |
| Written in | JavaScript | Python |
| Last push | 2026-01-09 | 2026-09-17 |
| Forks | ⑂ 6.9K | ⑂ 224 |
| 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 schemathesis if
- You want the schemathesis feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and schemathesis 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 schemathesis
Schemathesis is a Python API testing tool that generates test inputs from OpenAPI and GraphQL schemas. It adapts to server responses, chains operations into realistic workflows, and checks whether the API behaves as documented. The project lives in the Python developer tools ecosystem and connects with pytest, unittest, and property based testing workflows.
read the full schemathesis overview →
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Frequently asked questions
Is one-api or schemathesis more popular?
one-api has 36,932 GitHub stars and schemathesis has 3,608. one-api has the larger community by that measure.
Are one-api and schemathesis free?
Both are open source. one-api is licensed under MIT and schemathesis under MIT. Neither carries a licence fee.
What is the difference between one-api and schemathesis?
one-api is written in JavaScript and schemathesis in Python. 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 schemathesis?
Choose one-api if you want the larger community (36,932 stars) or its MIT licence terms. Choose schemathesis if its feature set, stack or MIT licence fits better. Both are self-hostable.