head to head · open source
one-api vs mockttp
one-api has 36,932 GitHub stars, 6,867 forks, 1,036 open issues and last shipped 8 months ago. mockttp has 883 stars, 113 forks, 40 open issues and last shipped yesterday. one-api leads on adoption by 4,083% (36,932 vs 883 stars). one-api is written in JavaScript under MIT; mockttp is written in TypeScript under Apache-2.0. one-api has attracted 19% as many forks as stars, mockttp 13%. mockttp was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (proxy), 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 | mockttp | |
|---|---|---|
| GitHub stars | ★ 37K | ★ 883 |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | TypeScript |
| Last push | 2026-01-09 | 2026-09-17 |
| Forks | ⑂ 6.9K | ⑂ 113 |
| 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 mockttp if
- You want the mockttp feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and mockttp 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 mockttp
Mockttp is an HTTP mock server and proxy library written in TypeScript and released under the Apache 2.0 license. It lives in the JavaScript and Node.js ecosystem, installed as a development dependency from npm, and it is part of HTTP Toolkit, where it powers all of the HTTP internals of that product. The same code that drives the interactive HTTP Toolkit application can therefore be used as a headless script, which makes the library both a testing tool and a scriptable rewriting proxy for capturing, inspecting and modifying HTTP traffic.
read the full mockttp overview →
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Frequently asked questions
Is one-api or mockttp more popular?
one-api has 36,932 GitHub stars and mockttp has 883. one-api has the larger community by that measure.
Are one-api and mockttp free?
Both are open source. one-api is licensed under MIT and mockttp under Apache-2.0. Neither carries a licence fee.
What is the difference between one-api and mockttp?
one-api is written in JavaScript and mockttp 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 mockttp?
Choose one-api if you want the larger community (36,932 stars) or its MIT licence terms. Choose mockttp if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.