Boulie, a smiling sourdough starter character, risen to the top of his glass jar in a warm morning kitchen

Your sourdough starter is alive.

Boulie is the sourdough starter tracker that gives your jar a face, a mood and a voice — scan it, and AI tells you the moment it's ready to bake.

Join the waitlist See how it works ↓
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Tamagotchi, but it makes bread

He has feelings.
They're driven by real data.

Feedings, rise, temperature, time — everything you log becomes his mood. Hungry means feed me. Peaked means bake now. You'll just know.

Restingfed & dozing
Hungryfeed me, please
Risingthe magic is happening
Peakedbake at the peak
Fridge modecold & cozy
The readiness scan

Point your camera at the jar.
That's it.

1

Scan the jar

Snap a photo. Boulie's AI reads the rise percentage straight from the glass — no rubber bands, no marker lines.

2

AI reads the rise

Rise %, time-to-peak and doubling speed, tracked over every feed. Your starter's rhythm, learned.

3

Bake at the peak

The moment it peaks, you'll know — with a notification and one very excited jar.

SKIP THE FLOAT TEST

When is a starter ready? Stop guessing.

The float test lies — high-hydration starters sink while perfectly active, tired ones float anyway. The truth is in the rise. Boulie watches your jar peak, learns how your starter behaves at your kitchen's temperature, and tells you the moment to bake. Peak fermentation, every time.

Serious tools under the cute

Hydration calculator, recipe scaler,
feed reminders — built in.

🧮

Hydration calculator

Any ratio, any flour, any batch. Baker's math without the math.

⏰

Smart feed reminders

Tuned to your starter's actual rhythm and your kitchen's temperature — fridge mode included.

📖

Bake journal

Photos, crumb shots, notes and ratings. Every loaf remembered, every bake better.

Sourdough discard included

More than bread.

Pancakes, pizza, focaccia, starter birthdays — Boulie celebrates every bake, not just the boules.

Discard pancakes
Pizza night
Focaccia
Starter birthdays
Questions bakers ask

Sourdough starter FAQ

When is my sourdough starter ready to bake with?

At its peak: roughly doubled, domed and full of bubbles — before it starts to fall. Boulie reads the rise from a photo of your jar and pings you at the peak, so you bake at maximum power instead of guessing.

Do I really need the float test?

No — it's famously unreliable. High-hydration starters can fail it while perfectly ready, and over-ripe starters can pass. Rise-tracking in the jar is more accurate, which is exactly what the scan does.

How often should I feed my starter?

Room temperature: usually every 12–24 hours. Fridge: about weekly. Boulie learns your starter's actual pace and reminds you at the right time — and never guilts you when life happens.

What hydration should my starter be?

100% hydration (equal flour and water by weight) is the happy default. The built-in hydration calculator handles any ratio and scales any recipe to your batch.

What if I forget to feed him?

Starters are tough — weeks-of-neglect tough. Boulie might get dramatic about it, but one good feeding and he's back to his bubbly self. Guilt-free, always recoverable.

Boulie the sourdough starter mascot celebrating a fresh loaf of bread

Name yours.
Keep him alive.
Bake at the peak.

Coming soon to iPhone. Join the waitlist and be first in when the jar opens.