head to head · open source
one-api vs zod-to-openapi
one-api has 36,940 GitHub stars, 6,867 forks, 1,036 open issues and last shipped 8 months ago. zod-to-openapi has 1,619 stars, 103 forks, 39 open issues and last shipped 6 days ago. one-api leads on adoption by 2,182% (36,940 vs 1,619 stars). one-api is written in JavaScript under MIT; zod-to-openapi is written in TypeScript under MIT. one-api has attracted 19% as many forks as stars, zod-to-openapi 6%. zod-to-openapi 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 | zod-to-openapi | |
|---|---|---|
| GitHub stars | ★ 37K | ★ 1.6K |
| License | MIT | MIT |
| Written in | JavaScript | TypeScript |
| Last push | 2026-01-09 | 2026-09-13 |
| Forks | ⑂ 6.9K | ⑂ 103 |
| 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 zod-to-openapi if
- You want the zod-to-openapi feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and zod-to-openapi 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 zod-to-openapi
A TypeScript library from Astea Solutions that generates OpenAPI (Swagger) documentation directly from Zod schemas, for API developers and teams who already validate requests with Zod and do not want to maintain a second, hand written specification.
read the full zod-to-openapi overview →
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Frequently asked questions
Is one-api or zod-to-openapi more popular?
one-api has 36,940 GitHub stars and zod-to-openapi has 1,619. one-api has the larger community by that measure.
Are one-api and zod-to-openapi free?
Both are open source. one-api is licensed under MIT and zod-to-openapi under MIT. Neither carries a licence fee.
What is the difference between one-api and zod-to-openapi?
one-api is written in JavaScript and zod-to-openapi in TypeScript. 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 zod-to-openapi?
Choose one-api if you want the larger community (36,940 stars) or its MIT licence terms. Choose zod-to-openapi if its feature set, stack or MIT licence fits better. Both are self-hostable.