Online Ruler vs BlankScreen

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 BlankScreen
Detail	Online Ruler	BlankScreen
What it does	Measure anything on your screen with pixel-perfect accuracy	Free fullscreen color screens and display tools in your browser
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Free	Free
Pricing	Not given	Not given
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	Fullscreen mode with one click Download backgrounds as PNG in multiple resolutions Works on any device without installation
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	No download or signup required, loads in under a second Works as a soft light source for webcam fill light Serves as a professional light table for tracing artwork Detects monitor issues including dead pixels and backlight dimming All tools run in browser with nothing uploaded or stored
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	4 +3 (up) since last check	Not checked yet
Trust Flow (Majestic)	0	7
Citation Flow (Majestic)	17	24
Referring domains (Majestic)	4	22

4 details filled in for both companies.

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