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TinyPNG vs Curtail: catalog facts
TinyPNG	Curtail
Freemium The online compressor is free; the developer API and image CDN have paid plans.	Free Free and open source under the GPL-3.0-or-later.
Web	Linux
Nothing to install, works in the browser Handles AVIF, JXL, WebP, PNG and JPEG	Handles PNG, JPEG, WebP and SVG Uses proven tools like oxipng and pngquant
Lossy compression changes image data Requires an internet connection and uploading images	Linux only Compression only, no other editing
Web application	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
Needs internet	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.