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FlClash vs sing-box: catalog facts
FlClash	sing-box
Free Free, open source and ad-free.	Free Free and open source under the GPL.
Windows, macOS, Linux, Android	Windows, macOS, Linux, Android, Command line
One client across Android and desktop systems Based on the Clash Meta core	One binary covering WireGuard, Shadowsocks, VMess, Trojan, Hysteria and more A routing engine that picks an outbound per connection by domain, IP or process
Needs a proxy subscription or server to be useful Documentation leans towards users already familiar with Clash	JSON configuration that is genuinely complex to write correctly Documentation assumes you already know the protocols involved
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 21, 2026

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