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Radmin vs UltraVNC: catalog facts
Radmin	UltraVNC
Paid Licences are bought through the Radmin online store.	Free Free and open source under the GPL.
Windows	Windows
Fast and usable over low-bandwidth connections AES-256 encryption of all session data	Standard VNC protocol, works with other VNC software File transfer, chat and service mode
Windows only Aimed at organisations rather than home users	Windows only Encryption requires a plugin in the main product
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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