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Zipic vs Curtail: catalog facts
Zipic	Curtail
Freemium 25 free images per day with basic features; Pro is a one-time purchase.	Free Free and open source under the GPL-3.0-or-later.
Windows, macOS, Command line	Linux
Processes images locally Wide format support including AVIF and JPEG XL	Handles PNG, JPEG, WebP and SVG Uses proven tools like oxipng and pngquant
Free tier limited to 25 images per day Windows version still in beta	Linux only Compression only, no other editing
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
Not stated if an account is 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 1, 2026

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