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
Cru Wine Vintage
Never choose the wrong vintage again.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included14 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 Cru Wine Vintage: map the core Reference 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
Provide detailed wine descriptions and user ratings.
Assumption to check: Limited user reviews lead to uncertainty about quality.
Validate with people who use this workflow before building.
Hypothesis 2
Use a clean tab navigation to streamline user experience.
Assumption to check: Navigation can be cluttered with too many options.
Validate with people who use this workflow before building.
Hypothesis 3
Clearly explain subscription benefits and include a free trial.
Assumption to check: In-app purchases may confuse users.
Validate with people who use this workflow before building.
Hypothesis 4
Add functionality for users to share their favorite wines with friends.
Assumption to check: Lack of social sharing features.
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
Never choose the wrong vintage again. Cru Vintage Guide is the most comprehensive wine vintage reference available on iPhone. 15,778 vintage reports across 335 appellations in 18 countries, from 1945 to 2024, with producer-level callouts for every legendary year. Whether you are choosing wine in a restaurant, buying at auction, building a cellar, or studying for a WSET or Court of Master Sommeliers exam, Cru gives you instant access to 80 years of vintage knowledge. WHAT'S COVERED France: Bordeaux (Left Bank, Right Bank, Pauillac, Saint-Julien, Margaux, Saint-Estephe, Pessac-Leognan, Pomerol, Saint-Emilion, Sauternes), Burgundy (Gevrey-Chambertin, Chambolle-Musigny, Vosne-Romanee, Meursault, Puligny-Montrachet, Chablis Grand Cru), Champagne, Rhone (Hermitage, Cote-Rotie, Chateauneuf-du-Pape), Alsace, Loire, Beaujolais Crus, Jura, Provence, Languedoc Italy: Barolo, Barbaresco, Brunello di Montalcino, Chianti Classico, Amarone, Bolgheri, Sagrantino di Montefalco, Primitivo di Manduria Germany and Austria: Mosel, Rheingau, Pfalz, Nahe, Wachau, Kamptal, Kremstal Spain and Portugal: Rioja, Ribera del Duero, Priorat, Bierzo, Douro Vintage Port, Alentejo New World: Napa Valley, Sonoma, Willamette Valley, Barossa Valley, Margaret River, Marlborough, Mendoza, Stellenbosch Plus Tokaj, Madeira, Santorini, Bekaa Valley, and more. FOUR-TIER RATING SYSTEM Every vintage is rated across four tiers: Legendary - mythic years that define an appellation. 1945 Bordeaux. 1971 Mosel. 1990 Burgundy. Excellent - standout years worth actively seeking out Good - reliable, honest vintages. No apology needed. Difficult - below-par conditions. Buy selectively. EVERY REPORT INCLUDES Vintage rating with seasonal summary Drinking window and cellaring guidance Producer callouts for the finest years, from DRC and Raveneau to Giacomo Conterno and Egon Muller Tags for quick context BUILT FOR SERIOUS WINE LOVERS Search by appellation, grape variety, or year Cellar tracker to log your bottles Works offline. No login required. No account needed. No ads. No subscription. One purchase. Cru Vintage Guide is editorially independent. No payment or consideration is accepted from any producer, negociant, or importer in exchange for ratings or mentions. For corrections and feedback: [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
Zustand
react-native-gesture-handler
react-native-reanimated
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.
