Pixel Perfect UI
Without the Struggle
Eliminate design QA hours. Instantly verify your implementation against Figma designs with AI-powered visual diff, accessibility auditing, performance monitoring, and one-click fixes.
Works with the tools you already use
How it looks
Pixel Perfect Verification
See exactly where your implementation deviates from the design. We catch the subtle details you might miss.
20+ tools in your browser toolbar
The most comprehensive free design QA extension. Inspect, edit, measure, annotate, and export — all without leaving your browser.
Inspect & Measure
Edit & Export
Analyze & Audit
Preview & Compare
Free & open source. Works on Chrome, Edge, Brave, Arc.
Features
Everything you need for
Flawless Implementation
From visual diffs to accessibility, performance, SEO, and responsive testing — one platform to ship pixel-perfect, production-ready UI.
Visual Diff Engine
Compare design mockups against your live implementation with sub-pixel precision. Detect color mismatches, spacing errors, and dimensional discrepancies — then auto-generate the CSS or Tailwind fixes.
- Pixel-level image alignment with scale normalization
- Regional color & spacing difference mapping
- Automatic CSS and Tailwind fix generation
Performance Scoring
Lighthouse-equivalent Core Web Vitals. FCP, LCP, CLS, TBT, TTI — weighted 0-100 scoring.
Accessibility Auditing
WCAG 2.1 compliance powered by axe-core. Color contrast validation with AA/AAA scoring.
One-Click Fixes
Generate CSS or Tailwind patches with confidence scores. Push fixes from browser to your codebase through Cursor or VS Code via MCP — one click from diff to shipped code.
- CSS-to-Tailwind class conversion
- Confidence scoring per fix suggestion
- Direct editor push via MCP protocol
SEO Analysis
11-point audit: metadata, headings, structured data, Open Graph, and link quality.
Responsive Testing
7 viewports from mobile to ultrawide. Overflow, touch targets, and tiny text detection.
Baseline Management
Percy-style snapshot approval workflow. Approve, reject, or batch-review baselines across all your components.
Build Tracking & GitHub PR Checks
Group comparisons by git commit. Post visual diff status checks on PRs to block merges until regressions are reviewed.
CSS Validation
Validate 118+ CSS properties with unit checking, color format validation, and warnings.
Team Collaboration
Workspaces with role-based access. Review workflows, comments, Slack/Discord webhooks, and shareable comparison links.
Capabilities
More than a visual diff tool
A complete UI quality platform — inspect, approve, report, and collaborate across your team.
DOM Inspection & Typography
Full box model visualization with alignment guides, internal spacing measurement, and typography analysis. Detect font size, weight, and line-height differences between design and code.
- Box model: margin, border, padding, content layers
- Alignment guides with crosshair measurement
- Internal child spacing visualization
- Font size, weight & line-height estimation
- Color and background extraction
Baseline Management
Percy-style approval workflows for visual changes. Approve or reject baselines per component, track changes over time, and catch unexpected regressions before they ship.
- Per-component baseline tracking
- Approve / reject visual changes
- Hash-based change detection
- Component-level status history
- Integration with comparison records
Reporting & Analytics
Track fix rates, weekly comparison trends, and project health across your entire workspace. Export full reports for compliance and stakeholder reviews.
- Weekly comparison trends with daily breakdown
- Per-project fix rate tracking
- Component-level diff metrics
- Full workspace export for audit
- Status breakdown: pending, resolved, archived
Integrate with everything
From browser to editor to CI pipeline — UI Inspect connects every part of your workflow.
How it works
Workflow optimized for
Maximum Velocity
No more screenshots. No more “move 1px left” tickets. Just straightforward verification.
Connect Your Design
Link your Figma designs directly to your codebase. UI Inspect creates a live bridge between design and implementation.
Analyze Components
Our engine scans your components in real-time, comparing pixel-by-pixel with your design and auditing accessibility, performance, and SEO.
Auto-Fix & Ship
Get CSS or Tailwind fixes with confidence scores. Apply them through your editor with one click and ship with confidence.
Start free. Scale when you're ready.
5,000 screenshots/month free. No credit card required.
- 5,000 screenshots / month
- 5 projects
- CI/CD CLI + GitHub PR comments
- Visual diff analysis
- Browser extension
- Unlimited screenshots & projects
- AI CSS / Tailwind auto-fix
- Figma design comparison
- MCP server + root cause analysis
- Component catalog & changelog
Stop debugging layout.
Start perfecting design.
Join developers who have swapped manual QA for instant, pixel-perfect verification with built-in accessibility, performance, and SEO auditing.