Mesurer - Inspect, annotate, and give feedback on any live interface

Mesurer runs directly where you build. Share feedback with your agents and your team.

Inspect, annotate, and give feedback on any live interface. Mesurer runs directly where you build. Share feedback with your agents and your team. ## Measure - Measure element dimensions - Add horizontal and vertical guides - Show pixel rulers - Hold Option / Alt to inspect spacing, padding, margins, and distances - Keep measurements and guides across reloads ## Inspect - Pick and copy colors - Inspect typography and text styles - Reveal page structure with X-ray mode - Understand layout and visual relationships ## Annotate - Draw arrows with snapping and click-to-place support - Draw freehand pen strokes - Add, edit, resize, rotate, and style text annotations - Select and transform multiple annotations together - Undo and redo annotation changes ## Capture - Capture any part of the interface - Include Mesurer overlays in screenshots - Copy or download the result instantly - Share precise visual context with your agents and team ## Built for visual feedback Mesurer adds a visual layer directly to the browser, making it easier to inspect interfaces, communicate changes, and explain exactly what you see. Useful for design engineering, frontend development, UI inspection, visual QA, and agent-assisted development. ## Open source and private by default - Free and open source - No account required - Your page content stays in your browser - Screenshots are processed locally - No remote code - No personal data collection