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PixelSnap vs Free Ruler: catalog facts
PixelSnap	Free Ruler
Paid Paid licence with a 30-day money-back guarantee.	Free Free and open source, with optional donations.
macOS	macOS
Fast edge detection for measuring on-screen objects Snappable guides and multiple object measurement	Measures in pixels, millimeters or inches Single-key shortcuts for every main action
macOS only Paid with no free tier	macOS only Requires macOS Sonoma or later; older builds are on the releases page
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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