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Ultrasurf vs GreenTunnel: catalog facts
Ultrasurf	GreenTunnel
Free Free to download and use.	Free Free and open source under the MIT licence.
Windows	Windows, macOS, Linux, Command line
Traffic is disguised as ordinary TLS web traffic Small, portable download that needs little setup	Works around DPI-based website blocking Desktop app and command-line tool
Closed source, so its security claims cannot be independently audited Focused on getting past censorship rather than full VPN features	Does not hide your IP address like a VPN or Tor Effectiveness depends on how a given ISP filters traffic
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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