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Free Alternatives to FusionAuth

Why pay for FusionAuth? Here are 3 free and open-source alternatives that deliver similar or better functionality.

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Recommended Free Alternatives

1
Free
Keycloak logo

Keycloak

Verified Jul 2026

An open source identity and access management solution — actively maintained by an open-source community and free for both personal and commercial use Positioned as a popular alternative to FusionAuth, offering comparable core features at zero cost.

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2
Free
Gluu logo

Gluu

Verified Jul 2026

A free open source identity and access management platform — actively maintained by an open-source community and free for both personal and commercial use Positioned as a popular alternative to FusionAuth, offering comparable core features at zero cost.

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3
Free
OAuth2 Server logo

OAuth2 Server

Verified Jul 2026

A free and open source OAuth 2.0 server implementation — with generous free-tier limits covering most personal and small-team projects Positioned as a popular alternative to FusionAuth, offering comparable core features at zero cost.

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Frequently Asked Questions

What are the best free alternatives to FusionAuth?
The best free alternatives to FusionAuth include Keycloak, Gluu, OAuth2 Server. All alternatives are verified as genuinely free (not freemium or free trials) and are actively maintained by the open-source community.
Is FusionAuth worth paying for in 2026?
That depends on your specific needs. FusionAuth offers premium features and polished UX, but for most users, the free alternatives listed on this page provide comparable functionality at $0. We recommend trying the free options first before committing to a paid subscription.
Are these FusionAuth alternatives really free?
Yes. Every alternative listed has been verified as genuinely free. Many are open-source (MIT, Apache, or GPL licensed), meaning you can use them commercially without restrictions. Some offer optional paid tiers for enterprise features, but the core functionality is always free.
How often are these alternatives updated?
Our directory is updated daily by an AI-powered system that discovers new tools, verifies existing ones, and checks that URLs are still active. Each alternative shows a "Verified" date indicating when it was last checked. Star counts for GitHub-hosted alternatives are refreshed every day.
Can I use these free security tools commercially?
Most of the alternatives listed can be used commercially. Open-source tools with permissive licenses (MIT, Apache 2.0, BSD) have no restrictions on commercial use. Tools with copyleft licenses (GPL) may require you to open-source derivative works. Always check each tool's individual license before deploying in production.

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