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PixelSnap vs Length: catalog facts
PixelSnap	Length
Paid Paid licence with a 30-day money-back guarantee.	Free Free and open source under the GPL-3.0-or-later licence.
macOS	Linux
Fast edge detection for measuring on-screen objects Snappable guides and multiple object measurement	Measures anything visible on screen Supports several units, including pixels and centimetres
macOS only Paid with no free tier	Linux only Small project with few contributors
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
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.