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Online Ruler vs QRThis

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 QRThis
DetailOnline Ruler logo Online RulerQRThis logo QRThis
What it doesFree on-screen measuring tools that run in your browser Free QR code generator with editable dynamic QR codes you can update after printing
StageNot given Not given
FoundedNot given Not given
Based inNot given US
Pricing modelFree Freemium
PricingNot given Free: unlimited static QR codes, custom colors and sizes, PNG and SVG downloads, free API (100 requests per IP per day), 1 dynamic QR code. Pro Lifetime: $29 one-time for unlimited dynamic QR codes, edit destinations anytime, scan tracking, priority support.
Key features
  • Actual-size ruler in cm, mm and inches
  • Bank-card and screen-diagonal calibration
  • Top, left and right rulers with drag-to-measure readout
  • Full-screen mode and browser-zoom warning
  • Image measurement tool
  • Length unit converter
  • Touch dragging support for phones and tablets
  • Local storage of calibration without server uploads
  • Customizable colors, sizes (256, 512, 1024px), and logo upload
  • Download QR codes as PNG or SVG
  • Scan tracking with date, time, and country data
  • Public API with 100 requests per IP per day
  • Instant updates without reprinting
  • Commercial usage with no license or attribution required
What makes it different
  • Calibration step compensates for browsers' inability to detect physical display size
  • ISO/IEC 7810 ID-1 standard bank card calibration ensures reproducible accuracy
  • All calculations run locally in your browser with no data sent to servers
  • Works on any device with a browser and JavaScript enabled
  • Content follows standards-based principles with no invented precision or fake reviews
  • Change where a QR code points after printing without creating a new code
  • No signup required for static QR code generation
  • One-time $29 lifetime purchase instead of a subscription
  • Privacy-focused scan tracking without IP storage or device tracking
  • Free public API with no authentication required
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)Not checked yet no change since last check9 no change since last check
Trust Flow (Majestic)20
Citation Flow (Majestic)1814
Referring domains (Majestic)105

4 details filled in for both companies.

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