head to head · open source
fastapi vs NelmioApiDocBundle
fastapi has 104,566 GitHub stars, 10,179 forks, 78 open issues and last shipped yesterday. NelmioApiDocBundle has 2,378 stars, 914 forks, 55 open issues and last shipped yesterday. fastapi leads on adoption by 4,297% (104,566 vs 2,378 stars). fastapi is written in Python under MIT; NelmioApiDocBundle is written in PHP under MIT. fastapi has attracted 10% as many forks as stars, NelmioApiDocBundle 38%. fastapi 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 | NelmioApiDocBundle | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 2.4K |
| License | MIT | MIT |
| Written in | Python | PHP |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 10K | ⑂ 914 |
| 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 NelmioApiDocBundle if
- You want the NelmioApiDocBundle feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches PHP
- You evaluated both and NelmioApiDocBundle 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 NelmioApiDocBundle
NelmioApiDocBundle The NelmioApiDocBundle bundle allows you to generate a decent documentation for your APIs. Installation Open a command console, enter your project directory and execute the following command to download the latest version of this bundle: Documentation Read the documentation on symfony.com Migrate from 4.x to 5.0 To migrate from 4.x to 5.0, follow our guide. This version comes with the following major changes: The bundle now requires PHP 8.1 or higher. Support for annotations has been removed in favor of PHP 8 attributes. Minimum Symfony version is now 6.4. Major cleanup and simplification of…
read the full NelmioApiDocBundle overview →
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Frequently asked questions
Is fastapi or NelmioApiDocBundle more popular?
fastapi has 104,566 GitHub stars and NelmioApiDocBundle has 2,378. fastapi has the larger community by that measure.
Are fastapi and NelmioApiDocBundle free?
Both are open source. fastapi is licensed under MIT and NelmioApiDocBundle under MIT. Neither carries a licence fee.
What is the difference between fastapi and NelmioApiDocBundle?
fastapi is written in Python and NelmioApiDocBundle in PHP. 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 NelmioApiDocBundle?
Choose fastapi if you want the larger community (104,566 stars) or its MIT licence terms. Choose NelmioApiDocBundle if its feature set, stack or MIT licence fits better. Both are self-hostable.