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Pngyu vs Optimage: catalog facts
Pngyu	Optimage
Free Free and distributed under the BSD license.	Freemium Free for 24 images per day; a full licence costs $15.
Windows, macOS	macOS
Gives pngquant a graphical interface Pre-built binaries for Windows and macOS	Automatic compression at consistent visual quality Supports many image formats plus MP4, WebM and PDF
Handles PNG files only No pre-built Linux binary	macOS only Free tier limited to 24 images per day
Downloadable app	Downloadable app
Open source	Closed source
License: BSD-3-Clause	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.