Observed arrival · 2026-09-07

LiveOnlineRuler Turns a Screen Into a Calibrated Ruler

liveonlineruler.com Observed source

Editorial interest 78/100 Selection signal · not a rating of the site

A free browser-based ruler for measuring in inches, centimeters, millimeters, and pixels at claimed physical scale.

Landing page captured for the 2026-09-07 issue.

Field notes

The interface starts with a displayed 96.0 PPI estimate and offers three calibration paths: automatic device detection, screen-diagonal entry, or alignment against an 85.6 mm credit card. Measurements can switch among inches, centimeters, millimeters, and pixels, while crosshair coordinates and movable guides support alignment work. The page states that the tool continues offline after loading and keeps measurements on the device, though those operational claims are not independently verified here.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

ƒJavaScriptBrowser-side code central

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A Record Press With a 0.4 mm Nozzle

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