head to head · open source
oauth2-proxy vs xxl-sso
oauth2-proxy has 15,021 GitHub stars, 2,200 forks, 285 open issues and last shipped yesterday. xxl-sso has 2,010 stars, 828 forks, 2 open issues and last shipped yesterday. oauth2-proxy leads on adoption by 647% (15,021 vs 2,010 stars). oauth2-proxy is written in Go under MIT; xxl-sso is written in Java under GPL-3.0. oauth2-proxy has attracted 15% as many forks as stars, xxl-sso 41%. xxl-sso was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (sso), 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
| oauth2-proxy | xxl-sso | |
|---|---|---|
| GitHub stars | ★ 15K | ★ 2.0K |
| License | MIT | GPL-3.0 |
| Written in | Go | Java |
| Last push | 2026-09-27 | 2026-09-27 |
| Forks | ⑂ 2.2K | ⑂ 828 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick oauth2-proxy if
- You weight community size — 15K stars and counting
- You want the MIT license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick xxl-sso if
- You want the xxl-sso feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches Java
- You evaluated both and xxl-sso fits your workflow better
About oauth2-proxy
OAuth2 Proxy is an open source, MIT licensed reverse proxy and middleware written in Go that puts OAuth2 and OpenID Connect authentication in front of web applications, aimed at operators and platform teams who need single sign on without adding auth code to every app.
read the full oauth2-proxy overview →
About xxl-sso
XXL SSO is a lightweight, extensible, Java based distributed single sign on framework, released under GPL 3.0, that lets a user log in once and then reach every trusted application, and it is aimed at teams building authentication into a single web application, a cross domain enterprise estate, or a multi terminal front end/back end separated system.
read the full xxl-sso overview →
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Frequently asked questions
Is oauth2-proxy or xxl-sso more popular?
oauth2-proxy has 15,021 GitHub stars and xxl-sso has 2,010. oauth2-proxy has the larger community by that measure.
Are oauth2-proxy and xxl-sso free?
Both are open source. oauth2-proxy is licensed under MIT and xxl-sso under GPL-3.0. Neither carries a licence fee.
What is the difference between oauth2-proxy and xxl-sso?
oauth2-proxy is written in Go and xxl-sso 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, oauth2-proxy or xxl-sso?
Choose oauth2-proxy if you want the larger community (15,021 stars) or its MIT licence terms. Choose xxl-sso if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.