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pngquant vs Rimage: catalog facts
pngquant	Rimage
Free Free and open source; the CLI is under GPL-3.0-or-later with some parts under HPND and…	Free Free and open source, dual-licensed under Apache 2.0 and MIT.
Windows, macOS, Linux, Command line	Windows, Command line
Large file size reductions with preserved transparency Adaptive dithering with less noise	Modern codecs for small output files Scriptable from the command line
Command line only; graphical use needs a separate front end Lossy, so not suited to images that must stay pixel-exact	No graphical interface No tagged releases on GitHub
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: Apache-2.0 OR MIT
No account 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 2, 2026

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