head to head · open source
fastapi vs NelmioApiDocBundle
fastapi has 102,409 GitHub stars, 9,906 forks, 78 open issues and last shipped 5 days ago. NelmioApiDocBundle has 2,368 stars, 910 forks, 55 open issues and last shipped yesterday. fastapi leads on adoption by 4,225% (102,409 vs 2,368 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%. NelmioApiDocBundle 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 | ★ 102K | ★ 2.4K |
| License | MIT | MIT |
| Written in | Python | PHP |
| Last push | 2026-09-14 | 2026-09-18 |
| Forks | ⑂ 9.9K | ⑂ 910 |
| 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 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 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 NelmioApiDocBundle
NelmioApiDocBundle is an MIT licensed Symfony bundle that generates REST API documentation from PHP 8 attributes, built for PHP and Symfony teams that want OpenAPI descriptions derived from their code rather than written and maintained by hand.
read the full NelmioApiDocBundle overview →
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Frequently asked questions
Is fastapi or NelmioApiDocBundle more popular?
fastapi has 102,409 GitHub stars and NelmioApiDocBundle has 2,368. 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 (102,409 stars) or its MIT licence terms. Choose NelmioApiDocBundle if its feature set, stack or MIT licence fits better. Both are self-hostable.