Kitchen Counter
I play pickleball most Mondays. Scoring is confusing if you're new, and pulling out your phone mid-game is annoying. I wanted to score with a twist of the Digital Crown on my Apple Watch.
The crown was the hard part. You'd twist it once and it would register two or three points. Claude and I went back and forth on it for a week. Seven different approaches. The fix ended up being a single keyword change in the code, but finding which keyword took five days.
We also built an iOS companion app, cloud sync between the watch and phone, workout tracking so it counts toward your Activity rings, and a stats dashboard. Then found out “Pickle Point” was taken on the App Store. Renamed to Kitchen Counter. In pickleball, the kitchen is the non-volley zone. Counter is what you do with the score.