head to head · open source
one-api vs Mockoon
one-api has 36,932 GitHub stars, 6,867 forks, 1,036 open issues and last shipped 8 months ago. Mockoon has 8,411 stars, 477 forks, 31 open issues and last shipped 2 days ago. one-api leads on adoption by 339% (36,932 vs 8,411 stars). one-api is written in JavaScript under MIT; Mockoon is written in TypeScript under MIT. one-api has attracted 19% as many forks as stars, Mockoon 6%. Mockoon 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 | Mockoon | |
|---|---|---|
| GitHub stars | ★ 37K | ★ 8.4K |
| License | MIT | MIT |
| Written in | JavaScript | TypeScript |
| Last push | 2026-01-09 | 2026-09-16 |
| Forks | ⑂ 6.9K | ⑂ 477 |
| 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 Mockoon if
- You want the Mockoon feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and Mockoon 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 Mockoon
Mockoon is an open source API mocking tool written in TypeScript and released under the MIT license. It ships as a desktop application built with Electron for designing and running mock servers locally, alongside a command line interface and a serverless package for running the same mock APIs in headless and cloud function environments. The project lives in the JavaScript and TypeScript ecosystem, distributed through NPM as @mockoon/cli and @mockoon/serverless , and through native package managers on each desktop platform. No remote deployment and no account are required to run it.
read the full Mockoon overview →
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Frequently asked questions
Is one-api or Mockoon more popular?
one-api has 36,932 GitHub stars and Mockoon has 8,411. one-api has the larger community by that measure.
Are one-api and Mockoon free?
Both are open source. one-api is licensed under MIT and Mockoon under MIT. Neither carries a licence fee.
What is the difference between one-api and Mockoon?
one-api is written in JavaScript and Mockoon 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 Mockoon?
Choose one-api if you want the larger community (36,932 stars) or its MIT licence terms. Choose Mockoon if its feature set, stack or MIT licence fits better. Both are self-hostable.