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Free Ruler vs StaticDesktopRuler: catalog facts
Free Ruler	StaticDesktopRuler
Free Free and open source, with optional donations.	Free Freeware distributed by the developer.
macOS	Windows
Measures in pixels, millimeters or inches Single-key shortcuts for every main action	Supports up to 20 customizable rulers Works across multiple monitors
macOS only Requires macOS Sonoma or later; older builds are on the releases page	Windows only
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	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 8, 2026

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