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

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