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3x-ui vs Outline VPN: catalog facts
3x-ui	Outline VPN
Free Free to use; the source code is published on GitHub.	Free The open-source software is free. Cloud hosting is paid separately.
Web, Self-hosted	Windows, macOS, Linux, Android, iOS
Supports a long list of proxy and tunnel protocols in one panel Multi-user management from a browser	Shadowsocks transport resists the blocking that stops ordinary VPNs Manager application makes server creation and key sharing simple
Requires your own server and some networking knowledge Tied to Xray-core rather than other proxy engines	You pay for and run the server yourself Access keys are shared secrets; anyone with one has your server
Self-hosted	Downloadable app
Open source	Open source
License not stated	License: Apache-2.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 22, 2026

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