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sing-box vs Outline VPN: catalog facts
sing-box	Outline VPN
Free Free and open source under the GPL.	Free The open-source software is free. Cloud hosting is paid separately.
Windows, macOS, Linux, Android, Command line	Windows, macOS, Linux, Android, iOS
One binary covering WireGuard, Shadowsocks, VMess, Trojan, Hysteria and more A routing engine that picks an outbound per connection by domain, IP or process	Shadowsocks transport resists the blocking that stops ordinary VPNs Manager application makes server creation and key sharing simple
JSON configuration that is genuinely complex to write correctly Documentation assumes you already know the protocols involved	You pay for and run the server yourself Access keys are shared secrets; anyone with one has your server
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: Apache-2.0
No account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 22, 2026

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