Good choice!
I have a couple notes:
:1 a flip option?: the app only has it set to guess the capital to the state. It would be nice if there was an option to guess the state to the capital.
:2 no label on a link to developers website: it would be nice to give consent before being led to a random website that my browser labels as (not secure). I love learning about developers (and they seem nice!) but this spooked me for a second when those spooked vibes could have been avoided with an “about us” label or something:)!