head to head · open source
fastapi vs fusio
fastapi has 102,471 GitHub stars, 9,913 forks, 78 open issues and last shipped 2 days ago. fusio has 2,116 stars, 241 forks, 169 open issues and last shipped 14 days ago. fastapi leads on adoption by 4,743% (102,471 vs 2,116 stars). fastapi is written in Python under MIT; fusio is written in PHP under Apache-2.0. fastapi has attracted 10% as many forks as stars, fusio 11%. 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 | fusio | |
|---|---|---|
| GitHub stars | ★ 102K | ★ 2.1K |
| License | MIT | Apache-2.0 |
| Written in | Python | PHP |
| Last push | 2026-09-18 | 2026-09-06 |
| Forks | ⑂ 9.9K | ⑂ 241 |
| 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 fusio if
- You want the fusio feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches PHP
- You evaluated both and fusio 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 fusio
Fusio is a self hosted, open source API management platform and gateway written in PHP that turns internal business logic, legacy databases, and microservices into documented API products for third party developers and autonomous AI agents.
read the full fusio overview →
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Frequently asked questions
Is fastapi or fusio more popular?
fastapi has 102,471 GitHub stars and fusio has 2,116. fastapi has the larger community by that measure.
Are fastapi and fusio free?
Both are open source. fastapi is licensed under MIT and fusio under Apache-2.0. Neither carries a licence fee.
What is the difference between fastapi and fusio?
fastapi is written in Python and fusio 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 fusio?
Choose fastapi if you want the larger community (102,471 stars) or its MIT licence terms. Choose fusio if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.