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