S.D Timer vs Boule

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.

Boule is a calm log for your sourdough starters that runs entirely on your device. Add a starter, set how often you feed it, and Boule counts down to the next feeding and reminds you when it is due. No account to create. Nothing leaves your device. - Track several starters, each with its own cadence and flour blend - Follow the in-app countdown to the next feeding and get a reminder when it is due - Scan the jar to read how much it has risen since the last feeding, on device - Work out flour, water, levain and salt in grams with baker percentages - Keep simple bake notes for each loaf you pull from the oven - A missed feeding softens into a rest state, never a guilt prompt Boule is built for the home baker tending one to three jars on the counter. Every feature works in airplane mode, so a flour-covered kitchen with no signal is no problem. Privacy Policy: https://docs.google.com/document/d/e/2PACX-1vTDX9pxPOlUJl_skVUHPi99mAw0y2B2BYd_v1mJkoF3xW3rlOcW5KlYd4t93MMbbGhctSTnBTy7d_l6/pub Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/