head to head · open source
Keycloak vs fido2-net-lib
Keycloak has 37,689 GitHub stars, 9,139 forks, 3,292 open issues and last shipped today. fido2-net-lib has 1,458 stars, 201 forks, 20 open issues and last shipped yesterday. Keycloak leads on adoption by 2,485% (37,689 vs 1,458 stars). Keycloak is written in Java under Apache-2.0; fido2-net-lib is written in C# under MIT. Keycloak has attracted 24% as many forks as stars, fido2-net-lib 14%. Keycloak 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.
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Side by side
| Keycloak | fido2-net-lib | |
|---|---|---|
| GitHub stars | ★ 38K | ★ 1.5K |
| License | Apache-2.0 | MIT |
| Written in | Java | C# |
| Last push | 2026-11-04 | 2026-11-03 |
| Forks | ⑂ 9.1K | ⑂ 201 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Keycloak if
- You weight community size — 38K 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 fido2-net-lib if
- You want the fido2-net-lib feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C#
- You evaluated both and fido2-net-lib fits your workflow better
About Keycloak
Open Source Identity and Access Management Add authentication to applications and secure services with minimum effort. No need to deal with storing users or authenticating users. Keycloak provides user federation, strong authentication, user management, fine grained authorization, and more. Help and Documentation Documentation User Mailing List Mailing list for help and general questions about Keycloak Join keycloak for general questions, or keycloak dev on Slack for design and development discussions, by creating an account at Reporting Security Vulnerabilities If you have found a security vulnerability, please…
read the full Keycloak overview →
About fido2-net-lib
Passkeys FIDO2 .NET Library (WebAuthn) A fully working and battle tested library for passkeys (FIDO2 and WebAuthn) on .NET Releases & Change log 💡 Bitwarden Passwordless API The quickest way to get started with FIDO2 and WebAuthn is with the Bitwarden Passwordless API. It's free up to 10k users and a faster way to start using passkeys on your website or mobile app. Bitwarden Passwordless.dev supports .NET Framework as well as the latest .net 8+. Get started with passwordless.dev Purpose Our purpose is to enable passwordless sign in for all .NET apps (asp, core, native). To provide a developer friendly and well…
read the full fido2-net-lib overview →
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Frequently asked questions
Is Keycloak or fido2-net-lib more popular?
Keycloak has 37,689 GitHub stars and fido2-net-lib has 1,458. Keycloak has the larger community by that measure.
Are Keycloak and fido2-net-lib free?
Both are open source. Keycloak is licensed under Apache-2.0 and fido2-net-lib under MIT. Neither carries a licence fee.
What is the difference between Keycloak and fido2-net-lib?
Keycloak is written in Java and fido2-net-lib in C#. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Keycloak or fido2-net-lib?
Choose Keycloak if you want the larger community (37,689 stars) or its Apache-2.0 licence terms. Choose fido2-net-lib if its feature set, stack or MIT licence fits better. Both are self-hostable.