head to head · open source
one-api vs swagger-core
one-api has 36,932 GitHub stars, 6,867 forks, 1,036 open issues and last shipped 8 months ago. swagger-core has 7,530 stars, 2,259 forks, 197 open issues and last shipped yesterday. one-api leads on adoption by 390% (36,932 vs 7,530 stars). one-api is written in JavaScript under MIT; swagger-core is written in Java under Apache-2.0. one-api has attracted 19% as many forks as stars, swagger-core 30%. swagger-core was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
← all 8884 open source comparisons
Side by side
| one-api | swagger-core | |
|---|---|---|
| GitHub stars | ★ 37K | ★ 7.5K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Java |
| Last push | 2026-01-09 | 2026-09-17 |
| Forks | ⑂ 6.9K | ⑂ 2.3K |
| 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 swagger-core if
- You want the swagger-core feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Java
- You evaluated both and swagger-core 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 swagger-core
Swagger Core is the Java implementation of the OpenAPI Specification that generates a machine readable REST API description from JAX RS2 annotations and Java classes, intended for Java server developers and API platform teams that publish and maintain OpenAPI documents alongside their services.
read the full swagger-core overview →
More in Developer Tools
Related comparisons
More API Development & Testing projects
Compare either of these against the rest of the API Development & Testing field.
Frequently asked questions
Is one-api or swagger-core more popular?
one-api has 36,932 GitHub stars and swagger-core has 7,530. one-api has the larger community by that measure.
Are one-api and swagger-core free?
Both are open source. one-api is licensed under MIT and swagger-core under Apache-2.0. Neither carries a licence fee.
What is the difference between one-api and swagger-core?
one-api is written in JavaScript and swagger-core in Java. 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 swagger-core?
Choose one-api if you want the larger community (36,932 stars) or its MIT licence terms. Choose swagger-core if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.