built by a brewer tired of forgetting things on brew day —
Everything you need to brew, on one desk.
Describe the beer you want. Brew chat drafts it on a real recipe sheet, does the math, and walks brew day with you.
FREE · NO ACCOUNT · 200,000 REAL BREWS BEHIND IT
HOW IT WORKS
Describe it. Edit it. Brew it.
The whole brew, from an idea to brew day, on one desk.
Tell Brew chat the beer you want, and it drafts a real recipe on a real sheet, from 200,000 real brews.
Tweak it in a state-of-the-art recipe builder, or tell the chat what to change. Every number is live, every change one undo away.
Brew day mode walks you through one step at a time, keeps the timers, and works out the fix when a reading misses.
nothing here is a mockup. every window is the real app —
Open the deskWHERE THE RECIPE COMES FROM
Drafted from 200,000 real brews.
Brew chat starts from what real brewers actually made. The sheet's own calculators do the math.
Every brew becomes a fingerprint.
Nine malt axes, nine hop axes, OG, IBU, SRM, BU:GU and body: 23 numbers, plus the yeast family.
Find the 40 nearest.
Their targets are averaged, grain share by role, hop timing and a vote on yeast, never a copy of any one recipe.
Solve it with real calculators.
One clean recipe, one real ingredient per role, and the sheet's own calculators set mash temperature, ABV and IBU.
The builder
Everything you expect. And more.
The familiar tools are all here, and the science underneath them is newer.
Citra Porch Pale18B. American Pale Ale
- OG
- —
- FG
- —
- ABV
- —
- IBU
- —
- SRM
- —
- Est. mash pH
- —
- Strike temp
- —
Seven of the 15 numbers the sheet keeps live. Drag anything.
That's the real engine. FG moves because the mash model is kinetic — validated on 59 measured beers.
Open it on the deskWhat you expect
- Live OG, FG, ABV, IBU and SRM
- BJCP style ranges
- Water chemistry
- Mash pH
- Equipment profiles
- Strike and sparge
- Yeast starters
- Carbonation, priming
- BeerXML import
- Fermentation schedule
- Brew day mode
- And the rest of the sheet→
And more
- Final gravity
A kinetic mash model
FG comes from simulating three enzymes through your mash steps rather than a fixed attenuation number, checked against 59 measured beers.
- Bitterness
IBU past the boil
Tinseth for the kettle, then whirlpool utilization, first-wort hops and a humulinone model for dry-hop bitterness.
- Mash pH
pH before you mash
A proton-deficit model sets your grain bill against the water's alkalinity and suggests lactic acid or baking soda.
- Water
Salts solved, not guessed
A least-squares optimizer works out the salt additions that take your tap water to a style's target profile.
- Brew day
One step at a time
Big type, timers that survive a closed tab, and when a gravity misses it offers DME, a longer boil or dilution.
- Flavor
Hop and malt radars
Nine axes each, redrawn on every edit, so you can see where a swap moves the beer.
All of it is free, no account needed.
Brew day
Miss a number on brew day? Get the fix.
Brew day checks your readings while a miss can still be fixed, so the beer comes out as planned.
- Pre-boil gravity 5 points low on this IPA: boil 35 minutes longer, or add 373 g of DME at flameout.
- Log what you actually put in and make it the recipe: next time starts from the brew you made.
- Notes on the desk remind you when the dry hop or a gravity reading is due.
- One step on screen at a time, and the timers keep running if you leave the page.
Try brew dayFree for everyone, signed in or not.
THE BREWING OS
Never open a new tab.
Look up hops, yeast and styles, run a calculator, even learn more about brewing, right beside the recipe you're working on.
Also on the desk:7 calculators →
PRICING
The builder is free.
Paid plans add unlimited recipes, export and more brew chat.
Free
The full builder.
$0/mo
What you get:
- The full builder, every calculation
- Brew day mode
- 5 saved recipes
- Import BeerXML
- A taste of Brew chat
Starter
For the odd question.
$2.99/mo
Everything in Free, plus:
- Unlimited recipes
- Export BeerXML & Markdown
- About 80 messages of Brew chat a month
- Not included: Remembers your brewery and journal
- Not included: Thinks as hard as you like
Brewer
For help on every brew.
$6.99/mo
Everything in Free, plus:
- Unlimited recipes
- Export BeerXML & Markdown
- About 215 messages of Brew chat a month
- Remembers your brewery and journal
- Thinks as hard as you like
Brewhouse
For brewing a lot.
$21.99/mo
Everything in Free, plus:
- Unlimited recipes
- Export BeerXML & Markdown
- About 730 messages of Brew chat a month
- Remembers your brewery and journal
- Thinks as hard as you like
Compare plans
| Plan | Free | Starter | Brewer | Brewhouse |
|---|---|---|---|---|
| The full builder, every calculation | Included | Included | Included | Included |
| Brew day mode | Included | Included | Included | Included |
| Import BeerXML | Included | Included | Included | Included |
| Saved recipes | 5 | Unlimited | Unlimited | Unlimited |
| Export BeerXML & Markdown | Not included | Included | Included | Included |
| Brew chat messages a month | a taste | ~80 | ~215 | ~730 |
| Remembers your brewery and journal | Not included | Not included | Included | Included |
| Thinks as hard as you like | Not included | Not included | Included | Included |
No card to start · Cancel anytime · Prices in USD
the sheet is free. brew chat costs me per message, so that's the part with a price.
LEARN
The math, written for brewers.
Each article takes one number in the builder and shows where it comes from.
- How To Use Brewing.ItA quick start guide — what the builder calculates, what to set up first, and how to use the numbers on brew day.
- IBU & BitternessTinseth utilization, whirlpool hops, dry-hop bitterness, and the science of iso-alpha acids.
- Gravity & ABVHow original gravity is built from your grain bill, and the path from OG to FG to alcohol.
- Water ChemistryWhat the ions do, the chloride-to-sulfate ratio, alkalinity, brewing salts, and how to calculate water additions.
- Mash pHThe proton deficit model — predicting and adjusting mash pH from grain and water chemistry.
- Mash TemperatureEnzyme kinetics, beta- vs alpha-amylase, and why mash temperature controls fermentability.
- Yeast StartersViability decay, pitching rates, and the White vs Braukaiser growth models explained.
- Hop Flavor RadarA 9-axis flavor model that maps hop character beyond IBU — citrus, tropical, resin, and more.
- Ingredient FreshnessHow hops, yeast, and grain age on the shelf, and how the app estimates what's still good from storage and time.
QUESTIONS
Things brewers ask.
ABV is roughly (OG - FG) × 131.25, where OG is original gravity and FG is final gravity. The recipe builder runs this for you on every edit. See the ABV calculator for the full breakdown.
IBU is International Bittering Units. The recipe builder uses the Tinseth model: alpha acid × utilization × hop weight, divided by batch volume. Utilization depends on boil gravity and boil time.
Mash pH is the pH of your wort during the mash. The sweet spot is 5.2 to 5.6. Outside that, enzyme efficiency drops and tannin extraction can spike. The builder calculates expected mash pH from your grain bill and water profile, and suggests acid additions when needed.
The Beer Judge Certification Program publishes a style guide with target ranges for every beer category. The builder loads BJCP ranges per style and shows in-range gauges for OG, FG, ABV, IBU, and SRM.
It depends on batch volume, beer temperature when bottling, and target carbonation level. The builder works all three out for you when you set up packaging. Most beers land around 4g per liter of corn sugar.
It depends on temperature and target CO2 volumes. The carbonation calculator covers it. For most pale ales served at fridge temp, around 12 PSI hits 2.4 volumes.
Pitch rate scales with original gravity and batch volume. The builder runs the math for liquid yeast packs and sizes a starter when one pack isn't enough.
The brew sheet handles it. Record your pre-boil reading and it suggests recovery options side by side: add DME at flameout, or boil longer. If late hops are in the kettle, it warns you before you boil them further.
TELL ME
Tell me what you think.
Found a bug, want a feature, or just want to say hi?
it goes straight to me.