Crumb is the sourdough tracker built for home bakers — log starter feedings, predict your starter's peak, time every bake phase, and document every homemade loaf in one place.

Whether you're maintaining your first sourdough starter or baking weekly, Crumb keeps a clear history of your bread baking workflow. Log starter feedings and discards, record dough preparation steps, store sourdough recipes, run live phase timers from autolyse through final bake, and capture notes from every loaf.

By tracking your bread baking process, you'll understand fermentation timing, hydration ratios, proofing windows, and how small adjustments shape the final crumb of your loaf.

Over time, Crumb becomes your personal sourdough journal — a complete record of every bake, every recipe, every starter feeding, and every peak window.

Free features

→ Sourdough starter log
Track starter feedings, discards, and activity with a simple feeding timeline.

→ Bread baking log
Record up to 2 bakes with notes, observations, and dough preparation details.

→ Sourdough recipe box
Store and organize your sourdough and bread recipes in one library.

→ Bulk fermentation calculator
Estimate bulk fermentation timing based on dough temperature.

→ Bake timers
Set timers for feeding schedules, autolyse, bulk fermentation, and proofing steps.

→ Share cards
Create beautiful share cards for your sourdough bakes.

crumb+ — unlock the full experience

→ Unlimited starters, bakes, and recipes

→ Kitchen Mode
A large-type, hands-free companion for floury fingers. Walks you through any saved sourdough recipe step-by-step, runs a starter-feeding helper, and keeps the screen on while you bake.

→ Peak-time predictions
Crumb learns when your sourdough starter peaks from temperature and feeding history, then notifies you at the perfect bake window — shown in plain English on a Peak Window card on every starter.

→ Hydration calculator
Calculate water, levain, flour, and salt weights from any dough formula.

→ Bake photos
Capture every stage of your loaf — from levain to scoring to final crumb.

→ Starter photos
Add a real photo of your jar to the starter profile, with an animated activity ring around it.

→ Bake rating & scoring
Score each loaf across crust, crumb, ear, flavor, and rise.

→ Bake statistics
Review hydration trends, scoring history, flour usage, and baking frequency.

→ Feeding streaks & milestones
Track starter feeding consistency, earn badges, and celebrate your progress.

Crumb is designed for home bakers, sourdough enthusiasts, and anyone who wants to improve their bread, keep a personal sourdough recipe book, and track every step of their baking journey.

Bake, learn, improve — one loaf at a time.

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