Free, open-source visual regression testing with AI-generated tests.

Record it. Test it. Ship it.

Lastest is a self-hosted visual regression testing platform that records your tests, writes them with AI, runs them anywhere, and fixes them when they break -- all in one tool.

1. Point it at your app
2. Record your user flows (point-and-click, no code)
3. AI generates resilient test code with multi-selector fallback
4. Every test runs inside an Embedded Browser container (EB stack required)
5. Screenshots compared with 3 diff engines (pixelmatch, SSIM, Butteraugli)
6. Review and approve visual changes -- or let AI auto-classify them

When self-hosted, your data stays on your server and your screenshots never leave your infra.

Create Tests        Run Tests           Review
  Record manually     Embedded            Approve/
  AI-assisted         Browser             Reject
  Play Agent auto     (system or BYO)     changes

  One-time cost       Zero AI per run     New baseline saved
  (AI optional)       (pure Playwright)

1. Create: Build tests your way -- record manually, let AI generate from a URL or spec, or let the Play Agent autonomously scan your entire app.
2. Run: Every test executes inside an Embedded Browser pod (system-managed or BYO) -- triggered from the UI, a webhook, a schedule, or CI/CD via the @lastest/runner trigger CLI. No AI needed -- pure Playwright execution. There is no local-Playwright fallback and no remote-runner daemon; the EB stack is required.
3. Compare: New screenshots are diffed against baselines using your chosen engine. Optional DOM-diff fallback catches structural changes when pixel comparison is inconclusive.
4. Review: Visual diffs are classified. Approve intentional changes -- they become the new baseline.
5. Fix: When tests break, AI can propose fixes to the test, or -- for real regressions -- the Fix-the-App Advisor can suggest a fix to your application code (never auto-applied). The Play Agent can fix and re-run autonomously.

• First run: screenshot becomes the baseline
• Every run after: new screenshot is SHA256-hashed -- if it matches the baseline, instant pass. If it differs, the diff engine runs and you review the change.
• AI costs are one-time: AI is only used during test creation and fixing. Running tests uses zero AI.
• No per-screenshot pricing on self-hosted: every run is unlimited regardless of volume.

• Getting Started -- Installation and first steps
• Creating Tests -- Three ways to create tests
• Running Tests -- Embedded Browser execution (system + BYO)
• API Tests -- Headless HTTP API testing with assertions
• Visual Diffing -- Diff engines and sensitivity settings
• AI Configuration -- AI providers and settings
• Fix-the-App Advisor -- AI application-code fix suggestions
• CI/CD Integration -- GitHub Actions, CI trigger CLI, Smart Run
• CI Trigger CLI -- @lastest/runner + Embedded Browser execution
• Docker Deployment -- Production deployment
• Settings Reference -- All configuration options
• Environment Variables -- Environment variable reference
• GitHub Integration -- OAuth, webhooks, PR comments
• GitLab Integration -- OAuth, MR comments, webhooks
• Google Sheets Integration -- Test data from spreadsheets
• Public Shares -- Watermarked /r/ share links + social cards
• Custom Webhooks -- Build result notifications
• VSCode Extension API -- VS Code extension and IDE API
• MCP Server -- AI agent integration (24 tools)
• Agent Monitoring -- Real-time Play Agent tracking
• Scheduled Runs -- Cron-based automated builds
• Bug Reports -- In-app bug reporting with auto-context
• Gamification -- Beat the Bot scoring, leaderboard, achievements
• API Tokens -- Long-lived Bearer tokens for MCP, CI, and integrations
• Test Migration -- Move tests between Lastest instances