head to head · open source
fastapi vs pythagora
fastapi has 102,402 GitHub stars, 9,903 forks, 78 open issues and last shipped 4 days ago. pythagora has 1,823 stars, 116 forks, 24 open issues and last shipped 3 months ago. fastapi leads on adoption by 5,517% (102,402 vs 1,823 stars). fastapi is written in Python under MIT; pythagora is written in JavaScript under Apache-2.0. fastapi has attracted 10% as many forks as stars, pythagora 6%. 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.
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Side by side
| fastapi | pythagora | |
|---|---|---|
| GitHub stars | ★ 102K | ★ 1.8K |
| License | MIT | Apache-2.0 |
| Written in | Python | JavaScript |
| Last push | 2026-09-14 | 2026-06-16 |
| Forks | ⑂ 9.9K | ⑂ 116 |
| 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 pythagora if
- You want the pythagora feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches JavaScript
- You evaluated both and pythagora 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 pythagora
Pythagora is a JavaScript tool for generating automated tests for Node.js applications with GPT 4. It lives in the Node.js testing ecosystem and aims to create unit tests without developers writing the test code by hand. The project works by finding an exported function, collecting related functions through AST parsing, and sending that context to a server that produces the tests. The README also says the repository is deprecated and that work has moved to GPT Pilot.
read the full pythagora overview →
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Frequently asked questions
Is fastapi or pythagora more popular?
fastapi has 102,402 GitHub stars and pythagora has 1,823. fastapi has the larger community by that measure.
Are fastapi and pythagora free?
Both are open source. fastapi is licensed under MIT and pythagora under Apache-2.0. Neither carries a licence fee.
What is the difference between fastapi and pythagora?
fastapi is written in Python and pythagora in JavaScript. 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 pythagora?
Choose fastapi if you want the larger community (102,402 stars) or its MIT licence terms. Choose pythagora if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.