Compare software

dssim vs Improve ImgSLI: catalog facts
dssim	Improve ImgSLI
Free Free and open source under the AGPL-3.0-or-later license.	Free Free and open source under the MIT License.
Windows, macOS, Linux, Command line	Linux
Compares PNG and JPEG images using a perceptual metric Supports alpha channels and color profiles	Magnifiers and split views help inspect image details Includes image difference modes and quality metrics
Scores are not directly comparable with those from other tools.	Available for Linux through Flathub.
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0-or-later	License: MIT
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.