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Optimage vs Curtail: catalog facts
Optimage	Curtail
Freemium Free for 24 images per day; a full licence costs $15.	Free Free and open source under the GPL-3.0-or-later.
macOS	Linux
Automatic compression at consistent visual quality Supports many image formats plus MP4, WebM and PDF	Handles PNG, JPEG, WebP and SVG Uses proven tools like oxipng and pngquant
macOS only Free tier limited to 24 images per day	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
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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