Rulerly
An online ruler that's actually calibrated to your screen
Rulerly launched on August 18, 2026 with 1 votes, #11,494 of 23,274 launches that month.
What it does
Most "online ruler" tools you'll find just guess at your screen's pixel density and hope for the best, and they're often extremely inaccurate. Rulerly fixes that with a 15-second calibration using any card in your wallet (they're all the same size), so what you see on screen is actually true to scale. In addition it features tracing tools, moving/resizing features, diagonal mode, and it works on any device.
Does a similar job
all alternatives →
Online Ruler – Measuring in inches/centimeters2025 · anruler.com · ▲88Free online ruler for accurate measuring in inches, centimeters, and millimeters. Use our real size digital ruler on any phone, tablet, or computer.
Screen Ruler - for Google Chrome2024 · chromewebstore.google.com · ▲143Made to measure. Built for everything else.
Ruler Online FreeJun 2026 · ruleronline.pro · ▲2Measure anything on your screen — actual size, no app needed
Accurate RulerSep 2026 · accurateruler.com · ▲1Free onlineRuler that shows actual real-world size on screen
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