Compare software

Length vs PixelSnap: catalog facts
Length	PixelSnap
Free Free and open source under the GPL-3.0-or-later licence.	Paid Paid licence with a 30-day money-back guarantee.
Linux	macOS
Measures anything visible on screen Supports several units, including pixels and centimetres	Fast edge detection for measuring on-screen objects Snappable guides and multiple object measurement
Linux only Small project with few contributors	macOS only Paid with no free tier
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	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 1, 2026

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