Levain Log: Sourdough Journal

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.