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Online Ruler vs ToolDolfen

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 ToolDolfen
DetailOnline Ruler logo Online RulerToolDolfen logo ToolDolfen
What it doesMeasure anything on your screen with pixel-perfect accuracy Simple Tools. Powerful Results.
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFree Free
PricingNot given All 48 tools free forever with no subscriptions or hidden fees
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
  • Image compression and resizing
  • PDF merging and splitting
  • Text processing and analysis
  • Image to text OCR conversion
  • Format converters for images and documents
  • Metadata and EXIF data removal
  • Password and QR code generation
  • JSON and CSV conversion
  • Base64 encoding and decoding
  • WebAssembly and HTML5 Canvas processing
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
  • Browser-side processing with zero server uploads and complete privacy
  • No account creation or email required
  • Completely free with no subscriptions or hidden costs
  • Instant browser-based processing without software installation
  • Fully responsive and touch-optimized for mobile devices
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 checkNot checked yet 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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