Remote Tidal from iPhone, how to connect?

I would be happy if any kind soul could help me explaining how to remote Tidal/Spotify etc from my iPhone.

I'm currently is about to close a deal on a Rega brio-r/dac combo, they will be connected to my MacBook running Tidal/Spotify.
Can I use my iPhone to control volume, change songs etc..? If so what is the easiest way to do that?

Thanks!