head to head · open source
fastapi vs Mockoon
fastapi has 102,402 GitHub stars, 9,903 forks, 78 open issues and last shipped 4 days ago. Mockoon has 8,411 stars, 477 forks, 31 open issues and last shipped 2 days ago. fastapi leads on adoption by 1,117% (102,402 vs 8,411 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%. Mockoon 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 | ★ 102K | ★ 8.4K |
| License | MIT | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-14 | 2026-09-16 |
| Forks | ⑂ 9.9K | ⑂ 477 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick fastapi if
- You weight community size — 102K 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 is an MIT licensed, high performance Python web framework for building APIs with standard Python type hints, aimed at Python developers and teams that need production ready HTTP services with automatic OpenAPI documentation.
read the full fastapi 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 fastapi or Mockoon more popular?
fastapi has 102,402 GitHub stars and Mockoon has 8,411. 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 (102,402 stars) or its MIT licence terms. Choose Mockoon if its feature set, stack or MIT licence fits better. Both are self-hostable.