Observed arrival · 2026-10-06
Linijka Online: a ruler calibrated to your screen
A free browser-based ruler for measuring in centimeters, millimeters, inches, or pixels, with horizontal and vertical placements along the screen edges.
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$Paid
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✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People measuring small objects at a computer, phone, or tablet
- Worth noticing
- Calibration can use a payment card specified as 85.60 mm wide; the site reports about half a millimeter of error over 20 cm.
Field notes
The calibration guide explains that CSS’s standard 96 pixels per inch is an assumption, not a measurement of a particular display. Users can choose a device model, enter screen diagonal, or match a payment card whose cited standard width is 85.60 mm. The page says calibration is saved in the browser and reports roughly half a millimeter of error over 20 centimeters; that accuracy figure is the site’s claim.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue