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Pngyu vs Curtail: catalog facts
Pngyu	Curtail
Free Free and distributed under the BSD license.	Free Free and open source under the GPL-3.0-or-later.
Windows, macOS	Linux
Gives pngquant a graphical interface Pre-built binaries for Windows and macOS	Handles PNG, JPEG, WebP and SVG Uses proven tools like oxipng and pngquant
Handles PNG files only No pre-built Linux binary	Linux only Compression only, no other editing
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License: GPL-3.0-or-later
No account needed	No account needed
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.