Online Ruler vs MJJ Tools

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 MJJ Tools
Detail	Online Ruler	MJJ Tools
What it does	Measure anything on your screen with pixel-perfect accuracy	160+ free online tools and utilities for calculations, conversions, and productivity
Stage	Not given	Startup
Founded	Not given	2024
Based in	Not given	Not given
Pricing model	Free	Not given
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	160+ free online tools
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	Instant access without downloads, installations, or registration required
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	9 no change since last check
Trust Flow (Majestic)	0	0
Citation Flow (Majestic)	17	21
Referring domains (Majestic)	4	11

3 details filled in for both companies.