head to head · open source
fastapi vs openapi-python-client
fastapi has 104,566 GitHub stars, 10,179 forks, 78 open issues and last shipped yesterday. openapi-python-client has 2,002 stars, 299 forks, 120 open issues and last shipped 5 days ago. fastapi leads on adoption by 5,123% (104,566 vs 2,002 stars). fastapi is written in Python under MIT; openapi-python-client is written in Python under MIT. fastapi has attracted 10% as many forks as stars, openapi-python-client 15%. fastapi was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 4 topic tags (fastapi, openapi, openapi3, python), 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 | openapi-python-client | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 2.0K |
| License | MIT | MIT |
| Written in | Python | Python |
| Last push | 2026-11-02 | 2026-10-29 |
| Forks | ⑂ 10K | ⑂ 299 |
| 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 openapi-python-client if
- You want the openapi-python-client feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and openapi-python-client 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 openapi-python-client
openapi python client Generate modern Python clients from OpenAPI 3.0 and 3.1 documents. This generator does not support OpenAPI 2.x FKA Swagger. If you need to use an older document, try upgrading it to version 3 first with one of many available converters. This project is still in development and does not support all OpenAPI features Why This? This tool focuses on creating the best developer experience for Python developers by: 1. Using all the latest and greatest Python features like type annotations and dataclasses. 2. Having documentation and usage instructions specific to this one generator. 3. Being…
read the full openapi-python-client overview →
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Frequently asked questions
Is fastapi or openapi-python-client more popular?
fastapi has 104,566 GitHub stars and openapi-python-client has 2,002. fastapi has the larger community by that measure.
Are fastapi and openapi-python-client free?
Both are open source. fastapi is licensed under MIT and openapi-python-client under MIT. Neither carries a licence fee.
What is the difference between fastapi and openapi-python-client?
fastapi is written in Python and openapi-python-client in Python. 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 openapi-python-client?
Choose fastapi if you want the larger community (104,566 stars) or its MIT licence terms. Choose openapi-python-client if its feature set, stack or MIT licence fits better. Both are self-hostable.