PixelTwin – Pixel Perfect Overlay

Pixel-perfect overlay for developers: put your mockup on the live page, split, measure, check colors and score the match.

PixelTwin puts your design mockup right on top of the live page, so you can see – pixel by pixel – where the build drifts from the design. Then go further: split, measure, check colors and get a match score. Made for front-end developers, designers and QA who want pixel-perfect results without jumping between Figma and the browser. ★ OVERLAY YOUR DESIGN • Drop, paste or link any PNG, JPG, WebP or SVG export as a layer • Adjust opacity, scale and rotation, and nudge with the arrow keys (Shift = 10px) • Blend modes – Normal, Invert, Difference, Multiply, Overlay – make every misaligned edge pop out • Lock a layer to click straight through it and keep using the page • @2x / @3x exports are scaled automatically to line up 1:1 with CSS pixels ★ COMPARE LIKE A PRO • Split view – drag a divider across the page to wipe between design and build • Match score – compares the page with your mockup, shows a similarity percentage and paints every mismatching pixel red, with adjustable tolerance • Measure – hover any element to see its size, pin one and hover another to see the gap between them, or drag to measure a box • Colors – a magnifier shows the page color and the design color under the cursor side by side; one click copies the hex value ★ STAY ORGANIZED • Unlimited layers and folders, saved separately for each website • Export and import your whole setup as a single file to share with teammates • The panel remembers where you left it and reopens after a reload ★ FAST AND FRIENDLY • Keyboard shortcuts: Alt+S show/hide, Alt+C lock, Alt+I invert, Alt+X split, Alt+H hide panel, = / − opacity • A clean glass-style panel with light and dark themes and your choice of accent color • Works on localhost, staging and production sites – and on local files once file access is allowed • Available in 55 languages ★ PRIVATE BY DESIGN Your mockups and settings are stored only in your browser's extension storage. PixelTwin has no account, no tracking and no analytics, and never sends your data to us or to anyone else. The screenshots used by Match and Colors are processed on your device and never leave it. HOW TO USE 1. Open the page you are building and click the PixelTwin icon in the toolbar. 2. Drop your design export onto the panel, or use Upload, Link or Paste. 3. Line it up, then try Split, Match, Measure or Colors. Tip: export your design at the same width as the browser viewport – or at 2x with "Match the display pixel ratio" turned on – for a perfect 1:1 comparison.