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Bitmask vs Ultrasurf: catalog facts
Bitmask	Ultrasurf
Free Free to use and open source under the GPL-3.0 licence.	Free Free to download and use.
Android	Windows
No account needed and automatic configuration Built-in tools for bypassing censorship	Traffic is disguised as ordinary TLS web traffic Small, portable download that needs little setup
Limited to a small set of compatible providers Speed and server choice depend on volunteer-run providers	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: GPL-3.0	License not stated
No account needed	Not stated if an account is 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.