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A companion for your sourdough starter.

Crum is a tool to support the health of your sourdough starter. Feed logging, reminders, health readings, and a chat for troubleshooting.

iOS only. Get an email when the beta opens.

Find the right routine.

Whether you're baking regularly, starting fresh, or just keeping it alive.

Crum's program card: Active selected among four programs, next feed in 12 hours with a peak forecast

Crum's status card: Strength, Yeast and Bacteria bars, with approx labels on the inferred readings

Understand your starter (scientifically).

Crum knows the science of sourdough and learns more about your starter as you progress.

Simple as 1:2:2

Select your feed ratio and flour type to log a feed. Customize either to match its exact diet.

Crum's feed sheet: ratio and flour chips, a peak forecast, one log feed button

We're on the rise!