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Curtail vs White Rabbit: catalog facts
Curtail	White Rabbit
Free Free and open source under the GPL-3.0-or-later.	Free Downloaded directly from the developer's site; no price is shown on the product page.
Linux	macOS
Handles PNG, JPEG, WebP and SVG Uses proven tools like oxipng and pngquant	Bulk SVG optimization Wraps SVGs in HTML
Linux only Compression only, no other editing	macOS only Narrow feature set focused on SVG
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.