CrumbKeeper: Sourdough
Predicts peak, bulk & bake day
Free · Designed for iPad. Not verified for macOS.
It does not time your bulk, it watches it. Type two jar heights and CrumbKeeper projects the finish in clock time from your own dough.
CrumbKeeper predicts your sourdough — from YOUR jar, in YOUR kitchen.
Every sourdough app has a feeding log and a timer. CrumbKeeper has a calibration ladder. It starts with a published temperature model, switches to your jar's own median once you've logged three peaks, and once you've logged four peaks at different room temperatures it fits YOUR STARTER'S OWN TEMPERATURE-RESPONSE CURVE — a fingerprint of your jar. From then on, every prediction follows your thermostat: a warm afternoon and a cold snap get different answers, computed from your own history. Every predicted time on the Forecast board says which rung it came from. Always a window, never a promise.
THE FORECAST BOARD
Open the app to one screen that answers the only questions that matter: when does my starter peak, when does bulk finish, when does bread actually come out of the oven. Drag the kitchen-temperature slider and every window re-solves.
IT WATCHES YOUR BULK — AND ARGUES WITH YOUR PLAN
Type two aliquot-jar heights and CrumbKeeper projects your bulk's finish from your dough's own measured rate. If that projection disagrees with your bake-day plan by more than 15 minutes, Bake Day says so — "your dough disagrees with the plan" — and one tap re-solves the rest of the day around the dough. The dough is always right.
THE STARTER FINGERPRINT
Swipe a feed "Peaked now" and CrumbKeeper pairs it with the kitchen temperature you logged. Four peaks across a few degrees and your jar gets its own fitted curve, drawn point by point on its detail screen. No other sourdough tracker learns your jar.
BAKE DAY, BACKWARD THEN FORWARD
"Bread out of the oven at 6 PM Saturday" plans the whole day backward — levain, autolyse, mix, bulk, folds, shape, retard, bake — then runs it forward with notifications, and re-plans when reality drifts.
AND THE REST
• 14-day from-scratch starter program that explains the scary days
• Feeding reminders, peak alerts and a next-feed widget
• Baker's math: dough vs true hydration, multi-flour blends, stiff levains
• Fix My Loaf triage that reads your own numbers, not a FAQ
• Journal with crumb photos and bake-over-bake deltas
• CSV export, full backup, and a converter
FREE, AND PRIVATE
Everything is free — no subscription, no ads, no account. Your data stays on your device.
TERMS & PRIVACY
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://jcreates.dev/privacy.html
Ratings & Reviews
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The developer, JOSHUA JOHN, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- JOSHUA JOHN
- Size
- 2.9 MB
- Category
- Food & Drink
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Joshua John