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Free Ruler vs xScope: catalog facts
Free Ruler	xScope
Free Free and open source, with optional donations.	Paid Paid app with a free trial.
macOS	macOS
Measures in pixels, millimeters or inches Single-key shortcuts for every main action	Many measurement tools in one app Loupe with color copying and vision impairment simulation
macOS only Requires macOS Sonoma or later; older builds are on the releases page	macOS only, requires 12.3 or later Paid after the trial
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.