About Nexmetra

Nexmetra builds free, accurate, browser-based measurement tools — no signup, no ads, no downloads. Every tool runs entirely in your browser, keeping your data private and making each tool available instantly, on any device.

Our first tool, the Online Ruler, was built to solve a real problem: most on-screen rulers assume a generic pixel density and call themselves accurate without ever verifying your actual screen. We built calibration into the core of the experience instead — letting you match a credit card, select your device, enter your screen size, or manually input your PPI, so measurements reflect true, real-world scale.

We're actively expanding Nexmetra with more measurement tools across length, weight, volume, and beyond — all built with the same principles: fast, accurate, free forever, and respectful of your privacy.