Yeast

The sourdough engine.

Yeast predicts your starter's peak from temperature and feed ratio, learns your culture over time, and back-solves whole bake schedules — bread, croissants, and a completely free pizza calculator. Research-grounded, 100% on-device. No account. No ads. No data leaves your phone.

Download on the App Store

Android: in closed testing — ask for an invite.

Starter

Peak prediction from temperature and feed ratio — and it learns your culture with every feed you log.

Pizza

Direct, biga, or poolish — a full pizza dough calculator with schedules. Free forever.

Journal

Log every bake with photos and ratings; outcomes sharpen the predictions.