Sourcery vs Percy
Sourcery and Percy are both popular tools in the Code Review & Testing space. Both use a freemium pricing model, with Sourcery 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 Sourcery if you want ai-powered python code review and refactoring assistant.. Sourcery's biggest strengths include excellent at improving python code quality and real-time ide integration catches issues as you code. 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. It's also rated higher (4.2 vs 4.1).
AI-powered Python code review and refactoring assistant.
Automated visual testing to catch UI regressions in every PR.
| Sourcery | Percy | |
|---|---|---|
| Pricing | Free | Free |
| Free Tier | Yes | Yes |
| Pricing Model | Freemium | Freemium |
| Rating | ★ 4.1 | ★ 4.2 |
| Categories | Code Review & Testing | Code Review & Testing |
| Key Features | 6 features | 6 features |
| Feature | Sourcery | Percy |
|---|---|---|
| AI-powered Python code review and refactoring | ✓ | — |
| Real-time suggestions in VS Code and PyCharm | ✓ | — |
| GitHub PR review integration | ✓ | — |
| Code quality metrics and scoring | ✓ | — |
| Custom rule configuration | ✓ | — |
| Batch refactoring across entire projects | ✓ | — |
| 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 | — | ✓ |
Sourcery
Pros
- + Excellent at improving Python code quality
- + Real-time IDE integration catches issues as you code
- + Free tier available for open-source and individual use
- + Suggestions are genuinely useful, not just style nits
Cons
- − Python-focused — limited support for other languages
- − Some suggestions may not match team conventions
- − Advanced features require paid plan
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 Sourcery if: you want ai-powered python code review and refactoring assistant.. It's completely free to use. Keep in mind: python-focused — limited support for other languages.
Choose Percy if: you prefer automated visual testing to catch ui regressions in every pr.. It's completely free to use. It holds a higher user rating (4.2 vs 4.1). Keep in mind: free tier limited to a small number of screenshots.
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