S.D Timer vs Crumb

S.D TIMER computes the exact feeding schedule for your sourdough starter, working backward from your target ready time to give you a precise feed time and gram-level recipe. HOW IT WORKS Enter six parameters: target ready time, quantity of starter needed (grams), desired hydration percentage, flour type, starter activity level (%), and ambient temperature (°C or °F). The app applies a fermentation kinetics model that factors temperature-dependent metabolic rates of lactic acid bacteria and wild yeast to calculate when your starter will hit peak activity. OUTPUT — YOUR FEEDING PLAN • Feed time: the exact moment to feed so your starter peaks on schedule • Starter / flour / water quantities in grams • Feed ratio (e.g., 1:9.8:9.8) • Estimated peak pH • Predicted flavor profile (mild, balanced, tangy, complex) • Recommended bread types suited to the resulting starter profile • Fermentation timeline chart with 80% activity window marked Set process alarms directly from the results screen to get notified at feed time and at peak. DESIGNED FOR PRECISION Temperature has a nonlinear effect on fermentation speed. A 5°C difference between summer and winter kitchens can shift peak time by 2–4 hours. S.D TIMER accounts for this so your timing stays consistent regardless of ambient conditions. Supports both Celsius and Fahrenheit. Works across all flour types including whole wheat, rye, spelt, and einkorn. Starter activity input lets you calibrate for your specific culture's behavior. PROFESSIONAL & HOME BAKERS Built for bakers who want repeatability and data-driven control over their sourdough process. Used by professional bakery instructors for workshop demonstrations and planning. No login required. Works offline once loaded. FREE VERSION This is the free edition of S.D TIMER, supported by banner ads. For an ad-free experience, upgrade to S.D TIMER Pro.

Tired of sourdough timing that's always off? Most apps give you fixed steps — but dough rises faster when it's warm and slower when it's cold. Crumb recalculates every step for YOUR dough temperature, so fresh bread is ready exactly when you want it. TEMPERATURE-SMART SCHEDULE Tell us when you want the loaf out of the oven. We work backwards through feed -> autolyse -> bulk -> fold -> shape -> proof -> bake, and recalculate every step for your dough temperature. Get a notification for each stage so you never miss a fold. STARTER TRACKER Log feedings, watch the rise curve, and get "time to peak" estimates plus feeding reminders. Keep multiple starters healthy and never wonder if yours is ready. CALCULATORS (FREE) - Baker's percentage calculator for any sourdough recipe - Full pizza dough calculator — Neapolitan, New York and Pan styles - Hydration calculator and handy unit converters The calculators are free, forever. CRUMB ANALYSIS Snap a photo of your loaf and get feedback on crumb, crust and proofing, so your next bake is better than your last. RECIPES & JOURNAL Start from proven recipes, then save every bake with photos and notes to build your own baking log. WHY BAKERS LOVE IT - No sign-up — open the app and start - Free calculators with no paywall - Timing that adapts to real conditions, not fixed steps - Works for sourdough bread AND pizza dough Free to start. Bake your best loaf yet. — Crumb Pro unlocks unlimited AI crumb scans, multiple starters with smart reminders, the temperature-smart schedule, an unlimited journal and premium recipes. - Weekly with a 3-day free trial - Yearly (save ~87% vs weekly) Payment is charged to your Apple ID. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the period. Manage or cancel in your App Store account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/