head to head · open source
openapi-generator vs fusio
openapi-generator has 26,848 GitHub stars, 7,751 forks, 5,820 open issues and last shipped 2 days ago. fusio has 2,129 stars, 247 forks, 169 open issues and last shipped 10 days ago. openapi-generator leads on adoption by 1,161% (26,848 vs 2,129 stars). openapi-generator is written in Java under Apache-2.0; fusio is written in PHP under Apache-2.0. openapi-generator has attracted 29% as many forks as stars, fusio 12%. openapi-generator 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
| openapi-generator | fusio | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 2.1K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Java | PHP |
| Last push | 2026-11-03 | 2026-10-26 |
| Forks | ⑂ 7.8K | ⑂ 247 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick openapi-generator if
- You weight community size — 27K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Java
- 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 openapi-generator
OpenAPI Generator Master ( 7.28.0 ): :star::star::star: If you would like to contribute, please refer to guidelines and a list of open tasks. :star::star::star: :bangbang: To migrate from Swagger Codegen to OpenAPI Generator, please refer to the migration guide :bangbang: :notebook with decorative cover: For more information, please refer to the Wiki page and FAQ :notebook with decorative cover: :notebook with decorative cover: The eBook A Beginner's Guide to Code Generation for REST APIs is a good starting point for beginners :notebook with decorative cover: :warning: If the OpenAPI spec, templates or any input…
read the full openapi-generator 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 openapi-generator or fusio more popular?
openapi-generator has 26,848 GitHub stars and fusio has 2,129. openapi-generator has the larger community by that measure.
Are openapi-generator and fusio free?
Both are open source. openapi-generator is licensed under Apache-2.0 and fusio under Apache-2.0. Neither carries a licence fee.
What is the difference between openapi-generator and fusio?
openapi-generator is written in Java 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, openapi-generator or fusio?
Choose openapi-generator if you want the larger community (26,848 stars) or its Apache-2.0 licence terms. Choose fusio if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.