Observed arrival · 2026-09-30
A ruler that calibrates to your screen
A Spanish-language on-screen ruler offers centimetres, millimetres, inches, measuring guides, and size references.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People measuring objects from a phone or computer
- Worth noticing
- Calibration can use device detection, screen diagonal, or a known-size reference such as an ISO-format card or euro coin.
Field notes
The calibration interface presents three routes: detect a device, enter its diagonal in inches, or match a displayed figure to an object of known size. Verification references include euro coins and an ISO/IEC 7810 ID-1 card; device detection is described as a comparison against known screen resolution and density data. The page cautions that similar device models can be hard to distinguish and suggests confirming uncertain results with a reference object.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
◎NicheUnusually specific use
One card from the complete issue