Happo vs SnapDiff
Happo
happo.ioSnapDiff
snapdiff.aiSide by side
| Figure | Happo | SnapDiff |
|---|---|---|
| Price from | $149/mo | $19/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 9 | 5 |
| Spec score · Visual Regression Testing Software | 9.2 (#1) | 7.8 (#16) |
| Headquarters | Stockholm, Sweden; Minneapolis, Minnesota, United States | Sacramento, California, United States |
| Security | Happo says data is encrypted in transit and at rest, conducts regular penetration testing, and treats customer screenshots and related data as confidential with account-level access controls. | The privacy policy states traffic uses TLS 1.2+, API keys are stored as hashes, and sensitive integration credentials are encrypted at rest. |
| Support | Support is founder-led by Henric Persson and Joe Lencioni through documentation, email and repository issues. | The contact form says SnapDiff will respond to questions, feedback, or enterprise pricing inquiries within one business day. |
Plans
Happo
- FreeFree
- FreeFree
- Starter$149 a month
- Starter$149 a month
- Growth$399 a month
- Growth$399 a month
- Pro$749 a month
- Pro$749 a month
- EnterprisePriced on request
In their own words
Happo
Happo checks interface changes with visual and accessibility regression testing. It captures screenshots of component variants in browsers; a snapshot is one variant in one browser, and a run usually occurs once per CI build. Accessibility testing is included on every plan. Framework options include Storybook, Playwright, Cypress, and a generic API. Repository integrations include GitHub, GitHub Enterprise, Bitbucket, Azure DevOps, and GitLab, though GitLab support is experimental. Its CLI detects CI providers such as GitHub Actions, CircleCI, Travis CI, and Azure DevOps. Available browsers vary by plan: the listed options are Chrome, Firefox, Safari, Microsoft Edge, and iOS Safari. The free plan includes 5,000 snapshots per month; once the quota is reached, the account pauses until the next cycle or an upgrade. Paid plans start at $149/mo, with additional snapshots charged on paid tiers. Happo began as a project in 2014, and its commercial product launched in 2017.
SnapDiff
SnapDiff captures web pages and compares screenshots pixel by pixel to identify visual regressions. Its HTTP API can compare two URLs without a test suite or CI/CD pipeline, and each diff returns a percentage, a highlighted image, and bounding boxes around changed regions. A GitHub Action runs visual checks on pull requests and can discover Vercel preview URLs. For scheduled monitoring, the watch API checks URLs on a cron schedule and sends webhooks when changes exceed a threshold. Comparisons use pixelmatch with antialiasing detection, configurable thresholds, ignore regions, and CSS selector masking. SnapDiff accepts HTTPS preview, staging, Storybook, and deployment URLs, including those on Vercel, Netlify, and Cloudflare Pages. Its MCP server supports Claude Code, Cursor, Windsurf, and other MCP clients for verifying UI changes. The service says it hides more than 40 cookie banners and 20 chat widgets and blocks more than 30 ad and tracker domains during capture. Free includes 200 diffs and 2,000 screenshots per month; paid plans start with Dev at $19 a month. Screenshots and diff images are retained during a subscription and for 30 days afterward.