Local UI Diff & Visual Bug Audit Studio

Hardware-accelerated screenshot comparison, pixel-perfect diffing & vector markup — 100% in your browser.

🔒 100% Local & Private

All images, diffs, and annotations are processed entirely in browser memory using Canvas & WebGPU. Zero bytes are ever sent to any server. Save sessions locally as JSON to continue later.

or paste / drag-drop images
Large / Fullscreen: Height = tallest image • export keeps full vertical white space • annotations stay pixel-perfect
BEFORE
BEFORE
AFTER
AFTER
UNIFIED OVERLAY CANVAS — markup & diff live here
Markup Tools:
Mouse over unified canvas for curtain slider & drawing. Click to place / select annotations.
Session JSON lets you resume editing later. Exports are fully local.
Phase 1–4 foundation • WebGPU context ready (full WGSL shaders & 60 FPS uniform buffers planned) • Vector engine (Fabric-style) active on 2D canvas fallback