HIITTimer

I had an old interval timer app I built years ago as a Xamarin learning experiment. When I decided to take AI-assisted development seriously, my first instinct was to port the old code. Instead, I used the old app as source material, generated a new product spec, and built the app again from a blank slate.

The app went from spec to internal testing in about two weeks, and was ready for wider public testing in just over a month.

The turning point came during testing. I was preparing to manually click through every option in the app, which is the kind of slow, necessary work that usually becomes a bottleneck. Then I watched Codex build the app, deploy it to an emulator, and start interacting with it on its own.

That changed what I thought was possible. Not because the human disappeared from the process, but because a whole category of execution work could be moved into the system.

Currently looking for testers. Reach out if you're interested.