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