I am so looking forward to the official Forem iOS/Android app going live along with the browser extension. I am using it daily to switch between all the Forem communities that I have joined. I love it!
In the meantime I have also used the Dev-iOS repo to deliver stand alone Forem apps into the AppStore for further discoverability as Forem are also doing some super interesting stuff around the integration of communities into mobile apps.
Feel free to send me a message if you want to know more about how to do this, the most complicated part is getting setup as an Apple Dev.