UI Regression Testing

UI regression testing without writing tests.

UIProof screenshots your UI before and after every deploy, diffs captures pixel-by-pixel, and uses AI to classify every change as cosmetic, intentional, or regression — automatically.

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Why UI regressions keep slipping through

Functional tests verify behavior. Visual bugs live somewhere else entirely.

Functional tests miss visual regressions

Your Playwright or Cypress tests verify behavior — buttons click, forms submit, data loads. But a component can work perfectly and look completely broken. UI regression testing closes the visual gap.

AI-generated code ships UI bugs at scale

Copilot, Cursor, and Claude Code ship code faster than any team can manually review. Every agent commit is a potential UI regression. UIProof makes visual review automatic.

Shared components break in unexpected contexts

When a design system component changes, it affects every page using it — often in ways no one tests. UIProof monitors every route so shared-component regressions surface immediately.

Mobile regressions are invisible on desktop

A responsive UI can look perfect at 1440px and be completely broken at 375px. UIProof tests every route at desktop, tablet, and mobile on every capture — automatically.

How UI regression testing works with UIProof

Five steps from zero to automated regression detection — no test framework required.

Add your URLs

Enter the routes you want to monitor. UIProof handles browser automation — no Playwright setup, no Selenium, no test code.

Capture your baseline

UIProof screenshots every route at desktop, tablet, and mobile. This becomes your visual reference for future comparisons.

Deploy your changes

Ship your feature, merge your PR, or let your AI agent generate code. Then trigger a capture via dashboard or API.

AI classifies every diff

UIProof compares before and after pixel-by-pixel. The AI layer classifies each change: cosmetic, intentional, or regression — with a severity score.

Fix only real regressions

Get email or webhook alerts on confirmed regressions. Ignore intentional UI updates. See exactly which routes and viewports were affected.

UI regression testing, fully automated

Screenshots, diffs, AI classification, and alerts — one tool, zero setup.

Pixel-level screenshot diff across 3 viewports

AI classification: cosmetic vs. intentional vs. regression

Severity scoring: minor / review / regression

No test framework required — works against any live URL

Capture history: compare any two snapshots over time

Email and webhook alerts on regressions

REST API for CI/CD pipeline integration

Persona-based UX review for conversion quality

AI writes the code. UIProof proves it didn't break anything.

AI coding agents move fast. They don't run visual tests. A Cursor session or a Codex commit can quietly introduce layout shifts, broken components, or mobile regressions that slip through every functional test. UIProof adds a visual safety net to every agent-driven deploy.

# Trigger UI regression check after Vercel deploy

curl -X POST https://uiproof.com/api/v1/capture \

-H "Authorization: Bearer YOUR_API_KEY" \

-d '{"site_id": "YOUR_SITE_ID"}'

Frequently asked questions

What is UI regression testing?

UI regression testing is the practice of verifying that recent code changes haven't broken the visual appearance of your application. Traditional regression testing checks functional behavior — UI regression testing checks what users actually see. It uses screenshots taken before and after changes, then compares them to detect unintended visual differences.

How does UIProof differ from Playwright visual comparisons?

Playwright's visual comparison tools are code-first — you write test scripts, maintain selectors, and run tests locally or in CI. UIProof is URL-first: you enter routes, UIProof captures and compares them automatically, and the AI layer classifies every diff. No test code, no infrastructure to maintain, and it works against any live site regardless of framework.

Can UIProof detect component-level regressions?

UIProof tests at the page level — it captures full-page screenshots across viewports. Component-level regressions that affect the rendered page (layout shifts, color changes, text wrapping, z-index issues) are visible in page-level diffs. For isolated component testing in design systems, tools like Chromatic/Storybook are complementary; UIProof covers the live production layer.

How does the AI know if a change is a regression or intentional?

UIProof's AI model analyzes both the before and after screenshots, the pixel diff overlay, and the change context. A full-width layout breaking on mobile is classified differently than a deliberate color update. You get a classification (cosmetic / regression / intentional), a confidence score, and a plain-English explanation of what changed and why it matters.

How do I integrate UI regression testing into CI/CD?

UIProof provides a public REST API. After your deploy completes, POST to the capture endpoint — UIProof runs the comparison and sends you results via email or webhook. Works with GitHub Actions, Vercel deploy hooks, Netlify, CircleCI, or any pipeline that supports HTTP calls.

What frameworks and tech stacks does UIProof support?

UIProof is framework-agnostic. It tests live rendered URLs in a real browser — Next.js, Nuxt, Remix, Astro, SvelteKit, Rails, Laravel, Django, or plain HTML all work the same way. If it has a URL and renders in a browser, UIProof can test it.

Ship with confidence. UIProof catches what you can't see.

Free plan. No credit card. No test code. Add your URLs and UIProof monitors every visual change across every viewport.

Start free — no credit card