head to head · open source
fastapi vs aimock
fastapi has 102,402 GitHub stars, 9,903 forks, 78 open issues and last shipped 4 days ago. aimock has 930 stars, 71 forks, 1 open issues and last shipped yesterday. fastapi leads on adoption by 10,911% (102,402 vs 930 stars). fastapi is written in Python under MIT; aimock is written in TypeScript under MIT. fastapi has attracted 10% as many forks as stars, aimock 8%. aimock 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
| fastapi | aimock | |
|---|---|---|
| GitHub stars | ★ 102K | ★ 930 |
| License | MIT | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-14 | 2026-09-17 |
| Forks | ⑂ 9.9K | ⑂ 71 |
| 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 aimock if
- You want the aimock feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and aimock 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 aimock
aimock is a TypeScript mock server that makes every AI provider, protocol, and service an application talks to answer on one local port, built for developers who need deterministic tests of LLM backed software without API keys, network calls, or surprise bills.
read the full aimock overview →
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Frequently asked questions
Is fastapi or aimock more popular?
fastapi has 102,402 GitHub stars and aimock has 930. fastapi has the larger community by that measure.
Are fastapi and aimock free?
Both are open source. fastapi is licensed under MIT and aimock under MIT. Neither carries a licence fee.
What is the difference between fastapi and aimock?
fastapi is written in Python and aimock 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 aimock?
Choose fastapi if you want the larger community (102,402 stars) or its MIT licence terms. Choose aimock if its feature set, stack or MIT licence fits better. Both are self-hostable.