OG Online Ruler Turns Your Screen Edge into a Measuring Tool

Why it surfaced

This is a small tool with unusually concrete interaction design: rulers can sit on any screen edge, guides can be pinned and nudged with arrow keys, and a two-point measure box can capture an area. Its calibration workflow uses automatic detection, device profiles, display diagonals, or a standard bank card, while storing calibration locally rather than uploading it.

A browser-based ruler that measures in centimeters, millimeters, inches, or pixels, with calibration controls for matching the scale to a physical display.