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dssim vs Image Compare: catalog facts
dssim	Image Compare
Free Free and open source under the AGPL-3.0-or-later license.	Free Free and open source under GPL-3.0-or-later.
Windows, macOS, Linux, Command line	Windows, Linux
Compares PNG and JPEG images using a perceptual metric Supports alpha channels and color profiles	Compare up to 12 images in side-by-side, stacked, or grid views Synchronized zoom and pan across images
Scores are not directly comparable with those from other tools.	Available for Linux and Windows
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0-or-later	License: GPL-3.0-or-later
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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