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Curtail vs Zipic: catalog facts
Curtail	Zipic
Free Free and open source under the GPL-3.0-or-later.	Freemium 25 free images per day with basic features; Pro is a one-time purchase.
Linux	Windows, macOS, Command line
Handles PNG, JPEG, WebP and SVG Uses proven tools like oxipng and pngquant	Processes images locally Wide format support including AVIF and JPEG XL
Linux only Compression only, no other editing	Free tier limited to 25 images per day Windows version still in beta
Downloadable app	Downloadable app
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	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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