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UltraVNC vs TightVNC: catalog facts
UltraVNC	TightVNC
Free Free and open source under the GPL.	Free Free and open source under the GPL. A commercial licence is sold for redistribution.
Windows	Windows, Linux
Standard VNC protocol, works with other VNC software File transfer, chat and service mode	Very light on resources, with a Java viewer that runs from any browser host Simple, dependable remote control on a local network
Windows only Encryption requires a plugin in the main product	No relay service; you must reach the machine yourself over the network VNC authentication is weak and needs to be tunnelled over SSH or a VPN
Downloadable app	Downloadable app
Open source	Open source
License: GPL	License: GPL-2.0
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 22, 2026

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