head to head · open source
Cap vs Opengrep
Cap has 7,798 GitHub stars, 579 forks, 10 open issues and last shipped 2 days ago. Opengrep has 3,084 stars, 263 forks, 92 open issues and last shipped yesterday. Cap leads on adoption by 153% (7,798 vs 3,084 stars). Cap is written in JavaScript under a custom or non-standard licence; Opengrep is written in OCaml under LGPL-2.1. Cap has attracted 7% as many forks as stars, Opengrep 9%. Opengrep 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
| Cap | Opengrep | |
|---|---|---|
| GitHub stars | ★ 7.8K | ★ 3.1K |
| License | Custom / other | LGPL-2.1 |
| Written in | JavaScript | OCaml |
| Last push | 2026-09-16 | 2026-09-17 |
| Forks | ⑂ 579 | ⑂ 263 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Cap if
- You weight community size — 7.8K stars and counting
- You want the Custom / other license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick Opengrep if
- You want the Opengrep feature set and don't need the biggest community
- You prefer the LGPL-2.1 license terms
- Your stack matches OCaml
- You evaluated both and Opengrep fits your workflow better
About Cap
Cap is a free, open source, self hosted CAPTCHA replacement that swaps visual puzzles for proof of work and instrumentation challenges, built for developers and site operators who want anti bot protection without shipping their visitors' data to a third party service.
About Opengrep
Opengrep is an open source static code analysis engine for finding security issues in code. It is a fork of Semgrep, released under the LGPL 2.1 license, and is backed by a consortium of AppSec organizations, including Aikido, Amplify, Endor Labs, Kodem, and Orca Security. The project lives in the developer security ecosystem as a command line SAST tool that scans source code for patterns and vulnerabilities.
read the full Opengrep overview →
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Frequently asked questions
Is Cap or Opengrep more popular?
Cap has 7,798 GitHub stars and Opengrep has 3,084. Cap has the larger community by that measure.
Are Cap and Opengrep free?
Both are open source. Cap has no licence declared in this registry, and Opengrep is licensed under LGPL-2.1. Both are free to self-host.
What is the difference between Cap and Opengrep?
Cap is written in JavaScript and Opengrep in OCaml. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Cap or Opengrep?
Choose Cap if you want the larger community (7,798 stars) or its Custom / other licence terms. Choose Opengrep if its feature set, stack or LGPL-2.1 licence fits better. Both are self-hostable.