head to head · open source
vuls vs crlfuzz
vuls has 12,267 GitHub stars, 1,244 forks, 92 open issues and last shipped 4 days ago. crlfuzz has 1,566 stars, 146 forks, 1 open issues and last shipped 26 days ago. vuls leads on adoption by 683% (12,267 vs 1,566 stars). vuls is written in Go under GPL-3.0; crlfuzz is written in Go under MIT. vuls has attracted 10% as many forks as stars, crlfuzz 9%. vuls was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (go, golang), 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
| vuls | crlfuzz | |
|---|---|---|
| GitHub stars | ★ 12K | ★ 1.6K |
| License | GPL-3.0 | MIT |
| Written in | Go | Go |
| Last push | 2026-09-19 | 2026-08-28 |
| Forks | ⑂ 1.2K | ⑂ 146 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick vuls if
- You weight community size — 12K stars and counting
- You want the GPL-3.0 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 vuls
Vuls is an agent less vulnerability scanner written in Go and licensed under GPL 3.0, aimed at system administrators and security teams that must find and track known vulnerabilities across Linux, FreeBSD, Windows and macOS hosts, containers, WordPress installs, programming language libraries and network devices without installing an agent on every machine.
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 vuls or crlfuzz more popular?
vuls has 12,267 GitHub stars and crlfuzz has 1,566. vuls has the larger community by that measure.
Are vuls and crlfuzz free?
Both are open source. vuls is licensed under GPL-3.0 and crlfuzz under MIT. Neither carries a licence fee.
What is the difference between vuls and crlfuzz?
vuls 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, vuls or crlfuzz?
Choose vuls if you want the larger community (12,267 stars) or its GPL-3.0 licence terms. Choose crlfuzz if its feature set, stack or MIT licence fits better. Both are self-hostable.