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RIOT vs PicSharp: catalog facts
RIOT	PicSharp
Free Free desktop image optimizer.	Free Free and open source under the AGPL-3.0 license.
Windows, macOS, Linux	Windows, macOS, Linux
Batch processing uses multiple CPU cores Preview original and optimized images side by side	Batch compression and watched folders Local compression with lossy and lossless options
The current macOS download is for Apple Silicon.	TinyPNG compression requires an internet connection and API key.
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: AGPL-3.0
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 4, 2026

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