Observed arrival · 2026-09-23
Easy Online Ruler: measure against your screen
A browser-based ruler measures spans in inches, centimeters, and millimeters, with three ways to calibrate it to actual size.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People measuring objects against a screen
- Worth noticing
- It refuses to guess external-monitor size: identical 1920×1080 resolutions can belong to 22- or 32-inch panels.
Field notes
The ruler can be placed along any of four screen edges, or users can drag across the stage to measure a span; the interface offers dual units and a copied readout. Calibration has three routes: device matching, a screen-diagonal calculation, and alignment to an ID-1 card. The page cautions that browser zoom affects the pixel-to-screen relationship and excludes external monitors from automatic size guesses.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
◎NicheUnusually specific use
One card from the complete issue