head to head · open source
fastapi vs fusio
fastapi has 104,566 GitHub stars, 10,179 forks, 78 open issues and last shipped yesterday. fusio has 2,129 stars, 247 forks, 169 open issues and last shipped 8 days ago. fastapi leads on adoption by 4,812% (104,566 vs 2,129 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 12%. 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 | ★ 105K | ★ 2.1K |
| License | MIT | Apache-2.0 |
| Written in | Python | PHP |
| Last push | 2026-11-02 | 2026-10-26 |
| Forks | ⑂ 10K | ⑂ 247 |
| 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 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 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 fusio
Fusio Open Source API Management Platform Turn your business logic into scalable API products for humans and AI agents. 📖 Documentation • 📺 Video Walkthrough (15m) • 💬 Discord Community Fusio is a self hosted, open source backend platform and API gateway written in PHP that bridges the gap between your internal infrastructure and the outside world. Whether you are exposing legacy databases, orchestrating microservices, or building custom business logic, Fusio handles the heavy lifting. It transforms your services into a professional API product, complete with an automated developer portal, SDK generation, and…
read the full fusio overview →
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Frequently asked questions
Is fastapi or fusio more popular?
fastapi has 104,566 GitHub stars and fusio has 2,129. 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 (104,566 stars) or its MIT licence terms. Choose fusio if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.