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Curtail vs Klia Kompress: catalog facts
Curtail	Klia Kompress
Free Free and open source under the GPL-3.0-or-later.	Free No price is mentioned; the app is published on Flathub under a proprietary EULA.
Linux	Linux
Handles PNG, JPEG, WebP and SVG Uses proven tools like oxipng and pngquant	Processes files locally without uploading Batch conversion with quality control
Linux only Compression only, no other editing	Proprietary, source not published Very new project with little history
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License: Proprietary EULA
No account 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.