head to head · open source
crowdsec vs crlfuzz
crowdsec has 14,975 GitHub stars, 721 forks, 296 open issues and last shipped 2 days ago. crlfuzz has 1,566 stars, 146 forks, 1 open issues and last shipped 1 months ago. crowdsec leads on adoption by 856% (14,975 vs 1,566 stars). crowdsec is written in Go under MIT; crlfuzz is written in Go under MIT. crowdsec has attracted 5% as many forks as stars, crlfuzz 9%. crowdsec 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
| crowdsec | crlfuzz | |
|---|---|---|
| GitHub stars | ★ 15K | ★ 1.6K |
| License | MIT | MIT |
| Written in | Go | Go |
| Last push | 2026-09-25 | 2026-08-28 |
| Forks | ⑂ 721 | ⑂ 146 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick crowdsec 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 crlfuzz if
- You want the crlfuzz feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Go
- You evaluated both and crlfuzz fits your workflow better
About crowdsec
CrowdSec is an open source, MIT licensed intrusion detection and prevention system, WAF and bot detection engine that analyses logs and HTTP requests and blocks malicious IPs at the firewall, reverse proxy or CDN, built for Linux, Windows, Docker and Kubernetes operators who want community sourced threat intelligence sitting behind their own infrastructure.
read the full crowdsec overview →
About crlfuzz
CRLFuzz is a fast, MIT licensed command line tool written in Go that scans web targets for CRLF injection vulnerabilities, aimed at penetration testers, bug bounty hunters, and security engineers who need to check either a single URL or a long list of them quickly.
read the full crlfuzz overview →
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Frequently asked questions
Is crowdsec or crlfuzz more popular?
crowdsec has 14,975 GitHub stars and crlfuzz has 1,566. crowdsec has the larger community by that measure.
Are crowdsec and crlfuzz free?
Both are open source. crowdsec is licensed under MIT and crlfuzz under MIT. Neither carries a licence fee.
What is the difference between crowdsec and crlfuzz?
crowdsec is written in Go and crlfuzz 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, crowdsec or crlfuzz?
Choose crowdsec if you want the larger community (14,975 stars) or its MIT licence terms. Choose crlfuzz if its feature set, stack or MIT licence fits better. Both are self-hostable.