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RIOT vs Image Optimizer: catalog facts
RIOT	Image Optimizer
Free Free desktop image optimizer.	Free Free and open source under the MIT licence.
Windows, macOS, Linux	Linux
Batch processing uses multiple CPU cores Preview original and optimized images side by side	Lossless compression with identical pixels Processes a whole folder at once
The current macOS download is for Apple Silicon.	Only PNG and JPEG Overwrites the original files in place
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 1, 2026

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