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Squash vs Caesium Image Compressor: catalog facts
Squash	Caesium Image Compressor
Paid Paid app, with additional effect packs sold separately.	Free Free and open source under the GPL.
macOS	Windows, macOS, Web
Batch resize, convert and compress in one step Removes or edits private metadata	Batch processing with visible before and after sizes for the whole folder Resize at the same time as compressing, in one pass
macOS only Extra effect packs cost more	No official Linux binary; you compile it or use a third-party build Windows 10 build 1809 or later and macOS 12 or later, 64-bit only
Downloadable app	Downloadable app, Web application
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 21, 2026

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