How I Built and Shipped a Swift App With Claude Code

My wife is a dancer, and for years I watched her fight with her tools instead of practicing. Learning a routine from a video usually means mirroring it, slowing it down, and drilling one section over and over. A normal video player isn't really built for that. There's no A/B loop, so you drag the playhead back by hand every rep. The speed steps jump from 0.5x straight to 1x. Comparing your run with the original means opening a video editor and spending a lot of time getting things lined up. And if you want to record yourself while the reference is playing, you need two devices.

So I built the app she wished existed.

Dashi Dance went live on the App Store on August 25, for iPhone and iPad, in 15 languages. The first commit, a requirements document, landed on June 16, so it took about ten weeks.

The...

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