Semgrep vs Coveralls
Semgrep and Coveralls are both popular tools in the Code Review & Testing space. Both use a freemium pricing model, with Semgrep starting at Free and Coveralls 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 3.9). Choose Coveralls if you prefer track code coverage over time and ensure test quality in every pr.. Key advantages include simple setup with most ci providers and free for open-source projects.
Fast, customizable static analysis for finding bugs and security issues
Track code coverage over time and ensure test quality in every PR.
| Semgrep | Coveralls | |
|---|---|---|
| Pricing | Free | Free |
| Free Tier | Yes | Yes |
| Pricing Model | Freemium | Freemium |
| Rating | ★ 4.3 | ★ 3.9 |
| Categories | Code Review & Testing | Code Review & Testing |
| Key Features | 6 features | 6 features |
| Feature | Semgrep | Coveralls |
|---|---|---|
| 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 | ✓ | — |
| Code coverage tracking and trend analysis | — | ✓ |
| Pull request coverage reporting | — | ✓ |
| Coverage threshold enforcement | — | ✓ |
| Support for all major languages and CI services | — | ✓ |
| Historical coverage data and charts | — | ✓ |
| Badge generation for repository READMEs | — | ✓ |
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
Coveralls
Pros
- + Simple setup with most CI providers
- + Free for open-source projects
- + Clean interface for tracking coverage trends
- + Good GitHub integration with PR checks
Cons
- − Less feature-rich than Codecov
- − UI feels dated compared to newer alternatives
- − Limited analytics on paid tiers
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 3.9). Keep in mind: advanced features like cross-file analysis require paid plans.
Choose Coveralls if: you prefer track code coverage over time and ensure test quality in every pr.. It's completely free to use. Keep in mind: less feature-rich than codecov.
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