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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 doesFree on-screen measuring tools that run in your browser 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
  • 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
  • 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
  • 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
  • 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)Not checked yet no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)20
Citation Flow (Majestic)180
Referring domains (Majestic)100

4 details filled in for both companies.

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