head to head · open source
one-api vs fusio
one-api has 36,940 GitHub stars, 6,867 forks, 1,036 open issues and last shipped 8 months ago. fusio has 2,116 stars, 240 forks, 169 open issues and last shipped 12 days ago. one-api leads on adoption by 1,646% (36,940 vs 2,116 stars). one-api is written in JavaScript under MIT; fusio is written in PHP under Apache-2.0. one-api has attracted 19% as many forks as stars, fusio 11%. fusio was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (api, api-gateway), 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
| one-api | fusio | |
|---|---|---|
| GitHub stars | ★ 37K | ★ 2.1K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | PHP |
| Last push | 2026-01-09 | 2026-09-06 |
| Forks | ⑂ 6.9K | ⑂ 240 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick one-api if
- You weight community size — 37K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- 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 one-api
One API is a self hosted LLM API management and key redistribution system that exposes many model providers through the standard OpenAI API format, aimed at developers, teams and operators who want a single endpoint, a single key model and a single quota surface across providers.
read the full one-api 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 one-api or fusio more popular?
one-api has 36,940 GitHub stars and fusio has 2,116. one-api has the larger community by that measure.
Are one-api and fusio free?
Both are open source. one-api is licensed under MIT and fusio under Apache-2.0. Neither carries a licence fee.
What is the difference between one-api and fusio?
one-api is written in JavaScript 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, one-api or fusio?
Choose one-api if you want the larger community (36,940 stars) or its MIT licence terms. Choose fusio if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.