Day 5: UI design, a foreground service, and a hard sync problem

Today had three acts: sketching the full UI concept, building a foreground service, and solving an audio/visual sync problem that turned out to require a C++ fix.

April 11, 2026 · 6 min · Karl-Ernst Kiel

Day 4: First audio prototype running on a real device

The metronome clicks on a real Android device. Here’s how Claude handled the architecture, Gemini wrote the code, and I directed traffic between them.

April 10, 2026 · 6 min · Karl-Ernst Kiel