Levain Log vs S.D Timer Pro

Track every bake. Master your sourdough. Levain Log is the bulk fermentation timer and bake journal built for home bakers who want to understand their dough — not just time it. Most sourdough failures come down to two things: inconsistent bulk fermentation and no record of what worked before. Levain Log solves both. INTELLIGENT Q10 FERMENTATION TIMING Levain Log uses Q10 — the biological principle that fermentation rate changes predictably with dough temperature — to give you accurate, real-time bulk fermentation estimates at every stage of the process. From your initial mix to your final stretch and fold, simply enter your dough temperature and Levain Log tells you exactly where you are in bulk fermentation. No more guessing. No more overfermented dough. STRETCH & FOLD LOGGING Log every stretch and fold with timestamps and dough temperature readings. Build a complete picture of your bulk fermentation from start to finish — and review it bake after bake to understand exactly how your dough behaves in your kitchen at any temperature. PROOFING TIMERS Set and track multiple proofing timers with notifications that alert you when your dough is ready — even hours later when your phone is locked and the app is closed. No more overproofed loaves because you lost track of time. HYDRATION CALCULATOR Calculate your dough hydration instantly. Dial in your formula and track it alongside your fermentation data for a complete picture of every bake. BAKE JOURNAL - PREMIUM Your complete bake journal lives in Levain Log. Review every bake with photos, ratings, and full fermentation data including temperature readings at every stage. See exactly how temperature affected your results and build the knowledge that turns good bakers into great ones. Unlimited bake storage means your journal grows with you. UNLIMITED RECIPES - PREMIUM Store unlimited recipes with full fermentation profiles. Compare bakes across different recipes and track your improvement over time. EXPORT YOUR DATA - PREMIUM Export your complete bake history and fermentation data as CSV, JSON, or PDF. Analyze your results, share your journey, or simply keep a backup. Your data is always yours. FREE TIER INCLUDES: - Full bulk fermentation timer with Q10 temperature-aware estimates - Stretch & fold logging with temperature tracking - Proofing timers with notifications - Hydration calculator - Single bake storage LEVAIN LOG PREMIUM INCLUDES EVERYTHING, PLUS: - Unlimited bake storage - Bake photos and ratings - Complete bake journal - Data export (CSV, JSON, PDF) - Unlimited recipe storage YOUR DATA STAYS ON YOUR DEVICE Levain Log stores everything locally on your device. No account required. No data collected. No subscription required for core features. Your recipes, bakes, and photos never leave your phone. Built by a sourdough baker, for sourdough bakers.

S.D TIMER Pro 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 Pro 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.