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Online Ruler vs White Screens

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Online Ruler compared with White Screens
DetailOnline Ruler logo Online RulerWhite Screens logo White Screens
What it doesMeasure anything on your screen with pixel-perfect accuracy Full-screen white light in your browser
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFree Free
PricingNot given Not given
Key features
  • Smart Auto-Detect identifies your device from a database of 100+ profiles
  • Three calibration methods: auto-detect, screen diagonal, and credit card
  • Place rulers on any edge of the screen in any combination
  • Click-to-measure distances in any direction
  • Live cursor position tracking
  • Dark mode with automatic system preference detection
  • Support for four measurement units: cm, mm, inches, and pixels
  • Full-screen white light display
  • Adjustable color temperature from 2,000 K to 9,000 K
  • Brightness control
  • Timer functionality
  • Keep screen on to prevent dimming
  • Dead pixel test with five colors
  • Refresh rate testing
  • Keyboard shortcuts for quick access
  • Multiple color options
  • Download images in multiple resolutions
What makes it different
  • No installation required—runs entirely in your web browser
  • Achieves near pixel-perfect accuracy typically within 0.5mm for well-calibrated screens
  • Completely free with no ads, account, or limitations
  • Calibration saved locally so no need to recalibrate on each visit
  • Works on tablets and mobile devices with touchscreen support
  • Runs entirely in browser with no app or sign-up required
  • Works on iPhone and Android when added to home screen
  • Completely free with no paid plans or subscriptions
  • Customizable warmth and brightness for different uses
  • Multiple screen test and diagnostic tools included
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)4 +3 (up) since last check1 no change since last check
Trust Flow (Majestic)00
Citation Flow (Majestic)170
Referring domains (Majestic)40

4 details filled in for both companies.

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