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Online Ruler vs ping123

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 ping123
DetailOnline Ruler logo Online Rulerping123 logo ping123
What it doesMeasure anything on your screen with pixel-perfect accuracy IP information lookup and network risk detection tool
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
  • Public IP lookup and display
  • Location, ISP, and ASN information
  • Native vs datacenter IP detection
  • Proxy, VPN, and Tor detection
  • AI app access risk checking
  • WebRTC leak detection
  • DNS leak testing
  • System and browser fingerprinting
  • Command line API access
  • Multi-language support
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 on Cloudflare Workers with no dedicated servers or databases
  • Browser-side detection computed only on user's device
  • Multiple data sources including Cloudflare edge network
  • API endpoint for programmatic access
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)1 no change since last check2 no change since last check
Trust Flow (Majestic)01
Citation Flow (Majestic)1718
Referring domains (Majestic)45

4 details filled in for both companies.

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