Companion App incorrect filtering & slow
Companion app has completely incorrect results when searching for cards where CMC == 0.
The app (Android) is also very slow to load assets at the beginning of the experience -- especially when compared to Gatherer. If anything, please just stop forcing a banner to switch to the companion app whenever I open Gatherer. If it continues, I'm just switching over to scryfall and not looking back.
Good catch! We'll file that bug and take a look at 0 mana search.