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ImageOptim vs oxipng: catalog facts
ImageOptim	oxipng
Free Free and open source under the GPL.	Free The open-source software is available without a license fee. Hosting, hardware and…
macOS	Windows, macOS, Linux, Command line
Runs several optimisers and keeps whichever result is smallest Removes GPS and EXIF data as part of optimising	Uses parallel processing and supports animated PNG files.
macOS only Optimisation is in place, so originals should be kept separately	It targets PNG formats rather than general image conversion.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	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 September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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