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Candid Tools vs Online Ruler

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

Candid Tools compared with Online Ruler
DetailCandid Tools logo Candid ToolsOnline Ruler logo Online Ruler
What it doesFree browser tools for images, PDFs, audio and more that run entirely in your browser Measure anything on your screen with pixel-perfect accuracy
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFree Free
PricingAll tools are free with no usage limits, no watermarks, and no features reserved for a paid plan. Not given
Key features
  • All processing runs in browser with no file uploads required
  • No account or login required to use any tool
  • 125 different tools covering images, PDFs, audio, video, text and data processing
  • 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
What makes it different
  • Files stay on your device instead of being uploaded to a server
  • Completely free forever with no paid tier or usage limits
  • No account creation or login required
  • Built by one developer focused on utility rather than growth metrics
  • Most tools run entirely client-side with no per-use server costs
  • 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
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 no change since last check1 no change since last check
Trust Flow (Majestic)70
Citation Flow (Majestic)2817
Referring domains (Majestic)284

4 details filled in for both companies.

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