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Pngyu vs OptiImage: catalog facts
Pngyu	OptiImage
Free Free and distributed under the BSD license.	Free Free and open source under the LGPL-2.1-only licence.
Windows, macOS	Linux
Gives pngquant a graphical interface Pre-built binaries for Windows and macOS	Lossless and lossy compression modes Option to keep or remove metadata
Handles PNG files only No pre-built Linux binary	Linux only Young project, first released in late 2024
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License: LGPL-2.1-only
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.