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TurboVNC vs UltraVNC: catalog facts
TurboVNC	UltraVNC
Free Free and open source under the GPL. The project relies on sponsorship and funded…	Free Free and open source under the GPL.
Windows, macOS, Linux	Windows
Tight encoding variant tuned for image-heavy applications, where ordinary VNC crawls With VirtualGL it displays 3D applications remotely at interactive speed	Standard VNC protocol, works with other VNC software File transfer, chat and service mode
VNC has no built-in encryption by default; you tunnel it over SSH or configure TLS Setting up VirtualGL alongside it is genuinely involved	Windows only Encryption requires a plugin in the main product
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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