S.D TIMER Pro is the professional, ad-free version of S.D TIMER — the sourdough starter scheduling tool used by home bakers and professionals worldwide.

Tell it when you need your starter to be ready. It calculates exactly when to feed it, how much starter, flour, and water to use — based on your ambient temperature, hydration level, flour type, and starter activity.

NO ADS. NO TRACKING. NO THIRD-PARTY SDKS.
Everything runs on your device. Your baking data stays yours.

KEY FEATURES:
• Reverse-calculation engine — set your target time, get precise feeding instructions
• Temperature compensation — accounts for ambient temperature effects on fermentation
• Fermentation timeline chart — visualize the usable window (80–100%)
• Supports 4 flour types: white, whole wheat, spelt, rye
• Hydration flexibility — works from stiff (50%) to liquid (150%) starters
• Starter activity calibration — tune to your culture's exact vigor
• Smart notifications — get reminded when to feed and when starter peaks
• 8 languages: English, Hebrew, French, Spanish, Arabic, Hindi, German, Dutch
• Celsius and Fahrenheit support
• 12h and 24h time formats
• Works offline — full PWA with service worker caching

WHY PRO?
The free version is supported by ads. Pro removes them entirely, giving you a clean, distraction-free experience while supporting continued development.

WHO IT'S FOR:
• Home bakers who want predictable, repeatable scheduling
• Professional bakers managing production timing
• Anyone tired of watching their starter all day

Developed by Water & Flour Workshops — professional sourdough education.
waterandflour.co.il