Semgrep vs Percy
Semgrep and Percy are both popular tools in the Code Review & Testing space. Both use a freemium pricing model, with Semgrep starting at Free and Percy at Free. Both offer a free tier to get started. Below we break down features, pricing, strengths, and weaknesses to help you decide which tool fits your workflow best.
Last updated: March 2026
Quick Verdict
Choose Semgrep if you want fast, customizable static analysis for finding bugs and security issues. Semgrep's biggest strengths include extremely fast performance compared to traditional sast tools and easy-to-write custom rules without deep ast knowledge. It's also rated higher (4.3 vs 4.2). Choose Percy if you prefer automated visual testing to catch ui regressions in every pr.. Key advantages include catches visual regressions that unit tests miss and excellent cross-browser testing coverage.
Fast, customizable static analysis for finding bugs and security issues
Automated visual testing to catch UI regressions in every PR.
| Semgrep | Percy | |
|---|---|---|
| Pricing | Free | Free |
| Free Tier | Yes | Yes |
| Pricing Model | Freemium | Freemium |
| Rating | ★ 4.3 | ★ 4.2 |
| Categories | Code Review & Testing | Code Review & Testing |
| Key Features | 6 features | 6 features |
| Feature | Semgrep | Percy |
|---|---|---|
| Pattern-based code scanning across 30+ programming languages | ✓ | — |
| Custom rule creation with intuitive YAML syntax | ✓ | — |
| Thousands of pre-built security and code quality rules | ✓ | — |
| CI/CD integration with GitHub Actions, GitLab, and more | ✓ | — |
| Fast local scanning with minimal false positives | ✓ | — |
| Differential scanning to analyze only changed code | ✓ | — |
| Automated visual regression testing | — | ✓ |
| Cross-browser screenshot comparison | — | ✓ |
| Responsive design testing across screen sizes | — | ✓ |
| GitHub and GitLab PR integration | — | ✓ |
| Approval workflows for visual changes | — | ✓ |
| Integration with Cypress, Playwright, and Storybook | — | ✓ |
Semgrep
Pros
- + Extremely fast performance compared to traditional SAST tools
- + Easy-to-write custom rules without deep AST knowledge
- + Strong open-source community with extensive rule library
- + Privacy-first with local scanning and no code upload required
Cons
- − Advanced features like cross-file analysis require paid plans
- − Learning curve for writing complex multi-pattern rules
- − Language support maturity varies across different ecosystems
Percy
Pros
- + Catches visual regressions that unit tests miss
- + Excellent cross-browser testing coverage
- + Good integration with popular testing frameworks
- + Approval workflow makes review process clear
Cons
- − Free tier limited to a small number of screenshots
- − Can produce false positives from dynamic content
- − Pricing scales with screenshot volume
The Bottom Line
Choose Semgrep if: you want fast, customizable static analysis for finding bugs and security issues. It's completely free to use. It holds a higher user rating (4.3 vs 4.2). Keep in mind: advanced features like cross-file analysis require paid plans.
Choose Percy if: you prefer automated visual testing to catch ui regressions in every pr.. It's completely free to use. Keep in mind: free tier limited to a small number of screenshots.
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