head to head · open source
fastapi vs aimock
fastapi has 104,542 GitHub stars, 10,173 forks, 78 open issues and last shipped 2 days ago. aimock has 1,000 stars, 82 forks, 1 open issues and last shipped 4 days ago. fastapi leads on adoption by 10,354% (104,542 vs 1,000 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%. fastapi 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.
← all 20902 open source comparisons
Side by side
| fastapi | aimock | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 1.0K |
| License | MIT | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-11-01 | 2026-10-30 |
| Forks | ⑂ 10K | ⑂ 82 |
| 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 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 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 aimock
aimock Mock infrastructure for AI application testing — point your SDK at one local port and every provider, protocol, and service answers deterministically. Quick start · The suite · Record & replay · Docs One package, one port, zero dependencies. LLM APIs, image generation and editing, text to speech, transcription, audio translation and generation, video generation, embeddings, MCP tools, A2A agents, AG UI event streams, vector databases, search, rerank, and moderation — no keys, no network, no surprise bills. Quick Start The aimock Suite aimock mocks everything your AI app talks to: Run them all on one port…
read the full aimock overview →
More in Developer Tools
Related comparisons
More API Development & Testing projects
Compare either of these against the rest of the API Development & Testing field.
Frequently asked questions
Is fastapi or aimock more popular?
fastapi has 104,542 GitHub stars and aimock has 1,000. 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 (104,542 stars) or its MIT licence terms. Choose aimock if its feature set, stack or MIT licence fits better. Both are self-hostable.