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
Coffee in the Sun
Say goodbye to unexpectedly cold terraces! With Coffee in the Sun, discover live which spots are bathed in sunlight and where shadows fall exactly.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
2 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.
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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 included16 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 Coffee in the Sun: map the core Weather 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
Implement better API providers and data validation.
Assumption to check: Users often report inaccurate weather data
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to set their own weather alerts based on preferences.
Assumption to check: Limited customization options for notifications
Validate with people who use this workflow before building.
Hypothesis 3
Streamline the interface and improve visual hierarchy.
Assumption to check: Some users find the UI cluttered
Validate with people who use this workflow before building.
Hypothesis 4
Add caching for previously viewed weather data.
Assumption to check: Lack of offline capabilities
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
Say goodbye to unexpectedly cold terraces! With Coffee in the Sun, discover live which spots are bathed in sunlight and where shadows fall exactly. Why you'll love Coffee in the Sun: LIVE SUN CHECK & 3D SHADOW MAP See at a glance where the sun is shining now. 3D simulation shows you live how building shadows fall. No surprises, only pure sunshine! YOUR SUNNY SPOT, WORLDWIDE From the city to the mountains: our app points you towards sunny hospitality worldwide. TIME TRAVEL FOR SUN LOVERS Plan your coffee date or lunch like a pro! Check hour by hour, for today or next month, when your favorite terrace catches the most sun. "Sorry boss, my terrace is only sunny at 2:30 PM!" FILTER BY YOUR WISHES Craving a quick espresso, an extensive lunch, or a cozy drink? Easily filter by hospitality type and directly find your ideal sunny spot. DIRECT WEATHER CHECK Perfect sun position and dry weather? Check directly in the app the current weather forecast. How does it work? Simple! LOCATION: Use your current location or search for an address. TIME: Check the sun now, or plan ahead with the time travel function. ENJOY: Choose your sunny terrace and go for it! Download Coffee in the Sun now and never miss a sunbeam again. Your perfect terrace is waiting for you!
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
axios
react-native-maps
@react-navigation/native
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.
