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
UV Index – Sun Safety Forecast
This application provides current UV Index for your location with hourly and daily forecast of the intensity of ultraviolet radiation from Sun.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
2 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 included15 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 UV Index – Sun Safety Forecast: 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
Integrate a broader location database or user input for custom locations.
Assumption to check: Limited location options for UV index data
Validate with people who use this workflow before building.
Hypothesis 2
Provide tailored advice based on the user's UV index level.
Assumption to check: No detailed safety advice according to UV levels
Validate with people who use this workflow before building.
Hypothesis 3
Introduce notifications to inform users when UV levels reach dangerous thresholds.
Assumption to check: Lack of push notifications for high UV alerts
Validate with people who use this workflow before building.
Hypothesis 4
Add charts/graphs to visualize UV index trends over time.
Assumption to check: No visual representation of UV index trends
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
This application provides current UV Index for your location with hourly and daily forecast of the intensity of ultraviolet radiation from Sun. Real-time UV Index tracker with 24-hour forecast, weekly predictions and safety tips for accurate UV protection! Key Features: - Real-time UV Index monitoring - Detailed hourly UV forecasts with visual graphs - 9-day UV prediction - Multiple location tracking - Instant worldwide city search - Color-coded UV level indicators - Specific protection recommendations - Location-based automatic updates Get accurate UV Index data for your current location or search any city worldwide. Receive timely alerts and specific protection advice based on current UV levels. Make informed decisions about your outdoor activities with precise UV Index data. This app provides clear, easy-to-understand UV level information with practical safety recommendations for each UV intensity level. Stay informed and protected from harmful UV exposure throughout the day.
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
React Navigation
Axios
Chart.js
Expo Location
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.
