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