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sing-box vs FlClash: catalog facts
sing-box	FlClash
Free Free and open source under the GPL.	Free Free, open source and ad-free.
Windows, macOS, Linux, Android, Command line	Windows, macOS, Linux, Android
One binary covering WireGuard, Shadowsocks, VMess, Trojan, Hysteria and more A routing engine that picks an outbound per connection by domain, IP or process	One client across Android and desktop systems Based on the Clash Meta core
JSON configuration that is genuinely complex to write correctly Documentation assumes you already know the protocols involved	Needs a proxy subscription or server to be useful Documentation leans towards users already familiar with Clash
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License not stated
No account needed	No account 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 24, 2026

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