It’s been almost three years since I set up Sonarr and Radarr on my NAS. Both do an amazing job managing my media library, and the setup has been rock solid.
The only part I never enjoyed was managing the library on the go.
If you’re building a similar setup, these posts might help:
The Fix
Use Ruddarr.

My initial plan was to check what clients already exist, decide I don’t like any of them, and build something for myself over a weekend.
That plan lasted maybe five minutes.
Ruddarr has pretty much everything I want from a mobile companion app. Browsing feels native, adding new movies and TV shows is fast, and the whole experience is vastly better than using the stock Sonarr and Radarr web UIs on iPhone.
The fact that it’s open source is the cherry on top. The app itself is free, setup takes minutes, and if your instances are already reachable from your phone there’s really no reason not to give it a try.
That’s it. I thought I’d share. If I had known there was a Sonarr and Radarr client that matched my setup this well, I would have been using it from day one.
Alternative
If you want one app that supports more of your self-hosted stack, Helmarr is worth a look too. Ruddarr is still the better fit for me, but Helmarr goes beyond just Sonarr and Radarr.