head to head · open source
Keycloak vs ProjectDiscovery
Keycloak has 37,657 GitHub stars, 9,129 forks, 3,292 open issues and last shipped yesterday. ProjectDiscovery has 32,543 stars, 3,962 forks, 107 open issues and last shipped yesterday. Keycloak leads on adoption by 16% (37,657 vs 32,543 stars). Keycloak is written in Java under Apache-2.0; ProjectDiscovery is written in Go under MIT. Keycloak has attracted 24% as many forks as stars, ProjectDiscovery 12%. 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 | ProjectDiscovery | |
|---|---|---|
| GitHub stars | ★ 38K | ★ 33K |
| License | Apache-2.0 | MIT |
| Written in | Java | Go |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 9.1K | ⑂ 4.0K |
| 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 ProjectDiscovery if
- You want the ProjectDiscovery feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Go
- You evaluated both and ProjectDiscovery 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 ProjectDiscovery
English • 中文 • Korean • Indonesia • Spanish • 日本語 • Portuguese • Türkçe Nuclei is a modern, high performance vulnerability scanner that leverages simple YAML based templates. It empowers you to design custom vulnerability detection scenarios that mimic real world conditions, leading to zero false positives. Simple YAML format for creating and customizing vulnerability templates. Contributed by thousands of security professionals to tackle trending vulnerabilities. Reduce false positives by simulating real world steps to verify a vulnerability. Ultra fast parallel scan processing and request clustering. Integrate…
read the full ProjectDiscovery overview →
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Frequently asked questions
Is Keycloak or ProjectDiscovery more popular?
Keycloak has 37,657 GitHub stars and ProjectDiscovery has 32,543. Keycloak has the larger community by that measure.
Are Keycloak and ProjectDiscovery free?
Both are open source. Keycloak is licensed under Apache-2.0 and ProjectDiscovery under MIT. Neither carries a licence fee.
What is the difference between Keycloak and ProjectDiscovery?
Keycloak is written in Java and ProjectDiscovery in Go. 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 ProjectDiscovery?
Choose Keycloak if you want the larger community (37,657 stars) or its Apache-2.0 licence terms. Choose ProjectDiscovery if its feature set, stack or MIT licence fits better. Both are self-hostable.