When I originally installed this I had a lot of issues with crashing when adding URLs and playback, but recent updates have fixed most of that. I enter a radio URL, and it appears on the accompanying Apple TV app (appears in the Purchased tab when you buy the iOS app, or vice versa). Though when the app asks to check for the link, instead fill out the data yourself or it will crash the iOS app. And if you decide you want to rename an app, it will call it a duplicate unless you toggle the favorite/public switch to favorite.
UI isn’t the best but it once t’s set up it does what I need it to. You can now run it in the background on your Apple TV 4th gen as well.