Design tools · Free
Mesurer
Open-source browser inspector to measure, annotate, and feedback any live UI.
An open-source React UI inspector and visual feedback tool. Drop it into any app to measure elements, add guides, rulers, arrows, pen strokes, text annotations, sample colors, capture screenshots, and share precise feedback with teammates or coding agents. MIT licensed.
On the site
- Live element measurement, guides, and rulers
- Arrows, pen, text annotations, and color picker
- X-ray mode, typography inspect, screenshots
- React component + browser extension friendly