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

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