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