head to head · open source
fastapi vs Mockoon
fastapi has 104,566 GitHub stars, 10,179 forks, 78 open issues and last shipped yesterday. Mockoon has 8,468 stars, 483 forks, 31 open issues and last shipped 2 days ago. fastapi leads on adoption by 1,135% (104,566 vs 8,468 stars). fastapi is written in Python under MIT; Mockoon is written in TypeScript under MIT. fastapi has attracted 10% as many forks as stars, Mockoon 6%. fastapi was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (api, openapi), 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
| fastapi | Mockoon | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 8.5K |
| License | MIT | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-11-02 | 2026-11-01 |
| Forks | ⑂ 10K | ⑂ 483 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick fastapi if
- You weight community size — 105K stars and counting
- You want the MIT license terms
- Your stack matches Python
- 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 fastapi
FastAPI framework, high performance, easy to learn, fast to code, ready for production Documentation : Source Code : FastAPI is a modern, fast (high performance), web framework for building APIs with Python based on standard Python type hints. The key features are: Fast : Very high performance, on par with NodeJS and Go (thanks to Starlette and Pydantic). One of the fastest Python frameworks available. Fast to code : Increase the speed to develop features by about 200% to 300%. Fewer bugs : Reduce about 40% of human (developer) induced errors. Intuitive : Great editor support. Completion everywhere. Less time…
read the full fastapi overview →
About Mockoon
Mockoon: awesome API mocking Mockoon is the easiest and quickest way to design and run mock APIs. No remote deployment, no account required, free and open source. It combines a desktop application to design and run mock servers locally, and a CLI to self host your fake APIs. A cloud is also available to collaborate with your team, keep your data in sync, and deploy your mock APIs. API mocking helps you speed up development and third party API integration by reducing dependency on external services and their limitations: rate limits, costs, availability, etc. It also allows you to test your applications in a…
read the full Mockoon overview →
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Frequently asked questions
Is fastapi or Mockoon more popular?
fastapi has 104,566 GitHub stars and Mockoon has 8,468. fastapi has the larger community by that measure.
Are fastapi and Mockoon free?
Both are open source. fastapi is licensed under MIT and Mockoon under MIT. Neither carries a licence fee.
What is the difference between fastapi and Mockoon?
fastapi is written in Python 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, fastapi or Mockoon?
Choose fastapi if you want the larger community (104,566 stars) or its MIT licence terms. Choose Mockoon if its feature set, stack or MIT licence fits better. Both are self-hostable.