Each family has its own starter recipe, temperature window, and pitch behavior. Pick the closest match.
Step 02 / Choose your scenario
Where are you starting from?
A fresh sachet skips the wake-up; a stored tube needs a tiny nutrient boost to revive cleanly.
★ Flask size
Which flask are you using?
Slide to pick. Bigger flask = more starter volume = more biomass. The recipe below auto-adjusts to a sane default at 75% fill, but you can tweak it.
Do you have a magnetic stirrer?
2000 mL flask · default recipe: 1000 mL water + 100 g DME
⚠Flask size & foam warning
The 1000 mL flask can only handle Kveik strains (like Lutra or Voss) because they produce ultra-low, thin foam. For everything else — especially aggressive top-cropping strains that build a thick foam blanket your stir bar can't pop — you'll need a larger flask to avoid a kitchen blowout.
High-risk strains (always need a 2000 mL or 3000 mL flask):
German Wheat / Witbier: Lallemand Munich Classic, WB-06, Wyeast 3068
Aggressive Belgian / Abbey: SafAle BE-256, Wyeast 3787, WLP530
Heavy ale strains: SafAle K-97 (Kölsch), London Ale III / Imperial Juice (A38)
★ Customize the starter recipe
Tweak the water & DME.
Defaults are pre-filled from the recipe. Water must stay at or below 75% of the flask capacity to leave room for foam.
mL
g
Step 03 / Label your tubes
Which generation are you building?
This number gets written on the tubes you'll harvest at the end. Used for tracking how many times this strain has been re-cultured.
2
Generation drift noteYou're deep into the multi-generation loop. Yeast can pick up mutations or minor contamination this far down the chain — the batch will likely still ferment fine, but it's worth banking a fresh sachet at some point.
Playbook01
Your playbook.
Custom-built for your strain and scenario.
Your Batch · Tell me about the beer
L
Typical homebrew kit batch is 20–23 L.
≈ 12.4 °P
Light beers 1.035–1.045 · standard 1.045–1.055 · strong 1.065+