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Mobile appsEasy1 weekendUnder $100Mobile appWeekend build

Brew Ratio

A pour over coffee timer with saved recipes and ratios for every bean you buy.

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The idea

Home coffee fans want repeatable cups. Brew Ratio calculates water from coffee weight and ratio, runs a step timer for bloom and pours, and saves notes for each bag of beans so the best recipe is easy to repeat.

Who it is for
Home coffee brewers
How it makes money
One time purchase
Suggested stack
Expo (React Native), Supabase for login and data
Launch cost
Under $100

Your first AI prompts

Paste these into Claude, Cursor or Lovable, in order. Check that each one works before moving on.

PROMPT 1 OF 3

Build an Expo app called Brew Ratio. Start with a calculator screen: coffee grams, ratio (like 1 to 16), and computed water grams, with a brew method picker (pour over, French press, AeroPress).

PROMPT 2 OF 3

Add a Recipe builder with timed steps (bloom 45 seconds with 50 g water, pour to 250 g, and so on) and a big timer screen that walks through steps with sound and vibration. Save recipes and a Beans list with roaster name, origin, roast date and tasting notes per brew.

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PROMPT 3 OF 3

Add a rating per brew and a best recipe badge per bean, a share recipe link, and a one time purchase to unlock unlimited recipes.

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The 10 step playbook

  1. 01Claim your ideaPut your name on it and unlock every prompt and the full playbook. Always free.
  2. 02Domain and nameBrainstorm a short name, check the .com, and register it.
  3. 03Trademark basicsSearch for conflicts before you fall in love with the name.
  4. 04AI build kickoffPaste the prompts below into Claude, Cursor or Lovable, one at a time.
  5. 05Server and hostingPick a host and have your AI walk you through setup.
  6. 06Backend and dataLogins, database and payments, one prompt at a time.
  7. 07Frontend and designScreens, colors and a simple logo that look professional.
  8. 08Go livePut it online, then submit to the App Store and Google Play if it is a mobile app.
  9. 09Marketing planLaunch posts, local outreach and your first 100 users.
  10. 10Launch and growShip it and add your live link to earn the Shipped badge.
Your full playbook for Brew RatioEvery step spelled out for this idea, with the exact prompts to paste into your AI.
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