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Curtail vs Optimage: catalog facts
Curtail	Optimage
Free Free and open source under the GPL-3.0-or-later.	Freemium Free for 24 images per day; a full licence costs $15.
Linux	macOS
Handles PNG, JPEG, WebP and SVG Uses proven tools like oxipng and pngquant	Automatic compression at consistent visual quality Supports many image formats plus MP4, WebM and PDF
Linux only Compression only, no other editing	macOS only Free tier limited to 24 images per day
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	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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