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.