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I downloaded it and tried it. It seems great so far.

One thing that I am curious of, is using this in conjunction with a separate VPN with 'Always-on-VPN', as it seems it is not compatible (asks me to disable 'Always-on-VPN').

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Can't use another VPN app along with it (an Android limitation). CalyxOS (an AOSP ROM) plans to add support for multiple active VPNs [0] and may be other ROMs will too.

The app can forward TCP over SOCKS5 to other installed apps that support SOCKS5 proxies (like Orbot).

That said, since half our code-base is in Golang, we plan to embed wireguard-go once we figure how to do so [1].

[0] https://gitlab.com/CalyxOS/calyxos/-/issues/349

[1] https://github.com/celzero/rethink-app/issues/52

It would be great in general if Android had more flexible APIs for implementing network filtering/VPNs. Perhaps this could be solved by some kind of app that registers a VPN service and exposes an API over some IPC mechanism so that other apps can handle filtering/routing? Although I don't know enough about Android to judge if that's feasible.

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