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Curtail vs Squoosh: catalog facts
Curtail	Squoosh
Free Free and open source under the GPL-3.0-or-later.	Free Free to use.
Linux	Web
Handles PNG, JPEG, WebP and SVG Uses proven tools like oxipng and pngquant	Side-by-side comparison makes it easy to judge quality versus file size trade-offs Runs entirely in the browser with no upload needed
Linux only Compression only, no other editing	Focused narrowly on compression and format conversion, not general image editing Best suited to single images rather than batch processing
Downloadable app	Web application
Open source	Closed source
License: GPL-3.0-or-later	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

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