head to head · open source
openapi-generator vs fusio
openapi-generator has 26,752 GitHub stars, 7,678 forks, 5,752 open issues and last shipped 3 days ago. fusio has 2,116 stars, 241 forks, 169 open issues and last shipped 14 days ago. openapi-generator leads on adoption by 1,164% (26,752 vs 2,116 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 11%. 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 | 2026-09-17 | 2026-09-06 |
| Forks | ⑂ 7.7K | ⑂ 241 |
| 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 is an Apache 2.0 licensed Java tool that generates API client libraries, server stubs, documentation, and configuration automatically from an OpenAPI Specification, and it is built for development teams that keep a machine readable API description and want generated code to stay in step with it.
read the full openapi-generator 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 openapi-generator or fusio more popular?
openapi-generator has 26,752 GitHub stars and fusio has 2,116. 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 (26,752 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.