Ultra Baker

Ultra Baker is a sourdough baker's percentage calculator built around how real baking works. Pick the loaf weight you want — it scales total flour, water, salt, and a two-stage starter in real time.

TWO MODES • Beginner — pick how many loaves and bake. 1200g loaves, 67% hydration, two-stage starter. The numbers just appear. • Pro — tune hydration (55–85%), salt, starter %, old-starter carry-over %, starter hydration with a "Link to dough" toggle, starter proof time, and a flour blend with as many flours as you want — sliders that always rebalance to 100%.

A BAKE-DAY TIMER THAT MAKES SENSE Eight phases from "build starter" to "rest before cutting", each with the right time and oven temperature. Once you press start, the timer keeps running and pings you for each step transition — even with the app closed. Lock-screen Live Activity and Dynamic Island show the active phase and countdown without unlocking your phone. Manual prev/next phase navigation if you want to skip ahead or step back.

A STARTER GUIDE BUILT IN Tap the book icon for a step-by-step starter guide — Beginner shows the recipe (1:1 by weight, 1/3 forward, 5–7 days to ready); Pro adds the science (yeast vs. lactic acid, fridge math, float test).

NO ACCOUNTS. NO ADS. Recipes save on your device. Nothing leaves your phone. No signup, no email, no tracking.

OFFLINE-READY Works without a network. Calculate on a plane, bake at the cabin.

WHY A CALCULATOR? Most sourdough recipes give you one fixed loaf at one fixed hydration. Real baking is percentages: change the loaf weight or push the hydration and everything else has to change with it. Ultra Baker does that math in one step so you can spend the time at the bench, not the spreadsheet.

DESIGNED FOR HOME BAKERS, BUILT BY ONE Made by a baker who got tired of redoing the math every weekend.

Free. Stays free.