Other VPN providers on MacOS implement split tunnel already. There is also an API for it already that just needs to be utilized.

I would imagine that implementing this feature would be incredibly difficult given how.Apple designed MacOS to be incredibly sandboxed. To the developers at Proton, check out Vopono¹ for a possible approach as how this could be done.

Update: PIA uses proxies? Mullvad, though multi-step, offers guidance on setting up split tunneling on Mac's using Tunnelblick and SOCKS. See https://mullvad.net/en/help/split-tunneling-mullvad-vpn and https://mullvad.net/en/help/socks5-proxy

In any event, this is the only missing feature preventing me from using ProtonVPN full time.

¹ https://github.com/jamesmcm/vopono

This seems conceptually very straightforward. Anecdotally, it's the principle change I make in my connection - far more often than the country or protocol.

+1
When ProtonVPN is activated, streaming serviced keep skipping when played over the Sonos (Mac) app.
Supremely disturbing.

Split tunneling needs to happen for Mac

Surprisingly, ProtonVPN has been probably my favorite Proton Technologies product since joining the service, initially for email. Split tunneling is great because some websites don't like it when you try to access them with a VPN. I wish it was available on other platforms besides PC, though. Mac and iOS at the very least would be very helpful for me.

We need split tunnelling on Mac, please. All the other kids have it.

Allow only selected apps to use vpn, all others should be ecluded from the vpn connection

You have split tunnel (by application) on Windows. I would like the feature to be available on macOS.

This would be great for Android.

Some applications do not like running under a VPN. It would be nice to specify applications that should not use the VPN service.