reviewdog vs Semgrep
A side-by-side comparison of two self-hosted developer tools & git options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | reviewdog | Semgrep |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 93 · Excellent | 95 · Excellent |
| Category | Developer Tools & Git | Developer Tools & Git |
| License | MIT | LGPL-2.1 |
| Language | Go | C |
| Setup difficulty | Easy | Medium |
| Min. RAM | 128 MB | 512 MB |
| Deployment | binary, docker | binary, docker |
| GitHub stars | ★ 9,619 | ★ 16,742 |
| First released | 2016 | 2020 |
| Replaces | SonarQube | SonarQube, Snyk Code |
What are reviewdog and Semgrep?
reviewdog
reviewdog is a tool that posts linter and static analysis results as inline comments on pull requests. It works with any linter that produces standard output and integrates with major Git hosts.
- Inline PR review comments
- Works with any linter
- Multiple Git host support
- Filters to changed lines
Semgrep
Semgrep is an open-source static analysis tool that finds bugs and security issues using lightweight, customizable rules. The CLI engine is open source and runs entirely in self-hosted CI.
- Pattern-based code search
- 30+ language support
- Custom rule writing
- Security rule registry
reviewdog vs Semgrep: key differences
Reviewdog is written in Go, while Semgrep is built with C. Licensing differs — MIT for reviewdog versus LGPL-2.1 for Semgrep. Reviewdog is the lighter option, starting around 128 MB of RAM against 512 MB for Semgrep. Reviewdog is the more established project (first released 2016), while Semgrep arrived in 2020.
Why pick each one
Choose reviewdog if…
- Released under the MIT license
- Easy to set up — beginner-friendly
- First-class Docker support for quick deployment
- Mature project with 9.6k GitHub stars
Choose Semgrep if…
- Fast pattern-based rules
- Many languages supported
- Easy custom rules
Watch out for
- Cross-file analysis limited
- Advanced features paid
Frequently asked questions
Is reviewdog or Semgrep better?
Neither is universally better. Semgrep has the larger community, while reviewdog is simpler to set up (easy difficulty). Choose based on the comparison table above and your own setup.
Are reviewdog and Semgrep free and open-source?
Yes. reviewdog is licensed under MIT and Semgrep under LGPL-2.1. Both can be self-hosted at no software cost.
Can I run reviewdog and Semgrep with Docker?
reviewdog: yes. Semgrep: yes.
Which is lighter on resources, reviewdog or Semgrep?
reviewdog has the smaller minimum footprint at 128 MB of RAM, compared to about 512 MB for Semgrep. Real-world usage depends on library size, user count, and enabled features.