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Length vs Free Ruler: catalog facts
Length	Free Ruler
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source, with optional donations.
Linux	macOS
Measures anything visible on screen Supports several units, including pixels and centimetres	Measures in pixels, millimeters or inches Single-key shortcuts for every main action
Linux only Small project with few contributors	macOS only Requires macOS Sonoma or later; older builds are on the releases page
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License not stated
No account 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.