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Ultrasurf vs Bitmask: catalog facts
Ultrasurf	Bitmask
Free Free to download and use.	Free Free to use and open source under the GPL-3.0 licence.
Windows	Android
Traffic is disguised as ordinary TLS web traffic Small, portable download that needs little setup	No account needed and automatic configuration Built-in tools for bypassing censorship
Closed source, so its security claims cannot be independently audited Focused on getting past censorship rather than full VPN features	Limited to a small set of compatible providers Speed and server choice depend on volunteer-run providers
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	No account needed
Needs internet	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.