Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Homebrew Timer
Homebrew Timer is a brew day app for beer brewers – it pushes notifications to your iPhone or iPad when it's time to add ingredients while your wort is boiling
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
8 ratings · Top 30%
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Homebrew Timer: map the core Food & Drink workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Add more customization for brewing methods and recipes.
Assumption to check: Limited brewing options for different coffee types
Validate with people who use this workflow before building.
Hypothesis 2
Integrate with smart devices for automated brewing.
Assumption to check: No integration with brewing equipment
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to share their brews and experiences with friends.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Provide onboarding tutorials for new users on how to brew coffee.
Assumption to check: Lack of user tutorials or guides
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Homebrew Timer is a brew day app for beer brewers – it pushes notifications to your iPhone or iPad when it's time to add ingredients while your wort is boiling. Select from an extensive list of hops, spices, fruits, herbs, and adjuncts included in the app, or easily add your own custom ingredients. Recipes are saved to your iPhone so they are ready to go next time you brew your favorite beer. Create and save recipes. Import recipes via beerXML files from your favorite homebrew recipe development software. Once started, Homebrew Timer will show the time remaining to add each ingredient and will push a notification to your device's screen Notifications work while app is in the background or closed. Notifications will appear on your Apple Watch if it is set up to mirror notifications for Homebrew Timer. Tap the “?” button on any screen for instructions. Let Homebrew Timer keep track of your brew day so you don't have to while you make great beer. Cheers!
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
React Navigation
Expo Notifications
React Native Reanimated
BUILD KIT DIFFICULTY
Starter
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
