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
The Great Coffee App
Popular espresso-based drinks and alternative brewing methods by an expert barista with many years of experience.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
190 ratings · Top 15%
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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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/
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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 The Great Coffee App: 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
Expand partnerships with more local coffee shops.
Assumption to check: Limited coffee shop options in certain areas
Validate with people who use this workflow before building.
Hypothesis 2
Optimize backend and frontend performance.
Assumption to check: Inconsistent performance during peak hours
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the purchase process and clarify benefits.
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Implement user review and rating system for shops.
Assumption to check: Lack of user reviews for shops
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
Popular espresso-based drinks and alternative brewing methods by an expert barista with many years of experience. - “App Store Best of 2013” in Chinese App Store; - #1 top paid app in "Food & Drinks" category in 30 countries; - #1 top paid app in 8 countries; - "Editor's choice" in South Korea; - Featured on crateandbarrel.com; - Featured by Apple in a TV ad. Demonstration of drinks in cross-section, videos of every step of the process, interesting facts about coffee, specially created music and impressive graphic design – all this will help expand your horizons and teach you about the world of Coffee. By covering the stages from beginner to expert, you will open up a whole new world of drinks, and may be one of them will become your favorite! Espresso-based drinks: - Espresso - Espresso Ristretto - Espresso Lungo - Espresso Macchiato - Espresso Con Panna - Espresso Romano - Espresso Doppio - Latte - Americano - Cappuccino - Flat white - Marocchino - Latte Macchiato - Caffe Mocha - Irish coffee - Flamingo - Cafecino - Vienna coffee - Crappa Brewing methods: - AeroPress - Turkish coffee - Pour-over - Cup brew - French press - Cold brew - Siphon - Vietnamese hot - Chemex - Moka pot Welcome for the world of Coffee! "This app is the sleek and sophisticated digital cookbook for coffee" Mashable.com "This is a superbly, yet simply designed app which gives short instructions and descriptions on how to make the various types of espresso and espresso based drinks" Sandboxgeneral.com "Overall, great app for coffee drinkers who want to extend their knowledge of coffee casually, rather than going all Wikipedia on it. Images are gorgeous, music is beautiful – a great experience!" Applecture.com Please send your ideas, critique, and other feedback at [email protected]
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
Supabase
Axios
React Navigation
React Native Maps
BUILD KIT DIFFICULTY
Intermediate
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.
