head to head · open source
oauth2-client vs xxl-sso
oauth2-client has 3,818 GitHub stars, 769 forks, 64 open issues and last shipped 12 days ago. xxl-sso has 2,010 stars, 828 forks, 2 open issues and last shipped yesterday. oauth2-client leads on adoption by 90% (3,818 vs 2,010 stars). oauth2-client is written in PHP under MIT; xxl-sso is written in Java under GPL-3.0. oauth2-client has attracted 20% 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 3 topic tags (authentication, authorization, 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-client | xxl-sso | |
|---|---|---|
| GitHub stars | ★ 3.8K | ★ 2.0K |
| License | MIT | GPL-3.0 |
| Written in | PHP | Java |
| Last push | 2026-09-16 | 2026-09-27 |
| Forks | ⑂ 769 | ⑂ 828 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick oauth2-client if
- You weight community size — 3.8K stars and counting
- You want the MIT license terms
- Your stack matches PHP
- 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-client
league/oauth2 client is an MIT licensed PHP library maintained by The PHP League that provides a reusable base for integrating applications with any OAuth 2.0 service provider, aimed at PHP developers who need to add "Connect with Facebook/Google" style login and token flows without implementing RFC 6749 from scratch.
read the full oauth2-client 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-client or xxl-sso more popular?
oauth2-client has 3,818 GitHub stars and xxl-sso has 2,010. oauth2-client has the larger community by that measure.
Are oauth2-client and xxl-sso free?
Both are open source. oauth2-client is licensed under MIT and xxl-sso under GPL-3.0. Neither carries a licence fee.
What is the difference between oauth2-client and xxl-sso?
oauth2-client is written in PHP 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-client or xxl-sso?
Choose oauth2-client if you want the larger community (3,818 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.