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PixelSnap vs Dippi: catalog facts
PixelSnap	Dippi
Paid Paid licence with a 30-day money-back guarantee.	Free Free and open source under GPL-3.0-or-later.
macOS	Linux
Fast edge detection for measuring on-screen objects Snappable guides and multiple object measurement	Calculates display DPI and aspect ratio from size and resolution Classifies density from very low DPI to ideal for HiDPI
macOS only Paid with no free tier	Designed primarily for GNOME and Linux
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
Not stated if an account is 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 8, 2026

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