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

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