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

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