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TightVNC vs UltraVNC: catalog facts
TightVNC	UltraVNC
Free Free and open source under the GPL. A commercial licence is sold for redistribution.	Free Free and open source under the GPL.
Windows, Linux	Windows
Very light on resources, with a Java viewer that runs from any browser host Simple, dependable remote control on a local network	Standard VNC protocol, works with other VNC software File transfer, chat and service mode
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	Windows only Encryption requires a plugin in the main product
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	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 22, 2026	Official website Full listing and sources Checked September 23, 2026

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