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
NOAA Radar US
Fast
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
1,532 ratings · Top 5%
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 NOAA Radar US: 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
Allow users to add and customize locations with nicknames.
Assumption to check: Limited location customization options
Validate with people who use this workflow before building.
Hypothesis 2
Implement faster data fetching with caching.
Assumption to check: Occasional lag in radar updates
Validate with people who use this workflow before building.
Hypothesis 3
Provide push notifications for severe weather alerts.
Assumption to check: No push notifications for severe weather
Validate with people who use this workflow before building.
Hypothesis 4
Offer hourly and daily forecasts in addition to radar.
Assumption to check: Lack of detailed weather data
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
Fast. Simple. Reliable. Hi-resolution. Predictive radar. Severe weather warnings. Snow/mixed precipitation display. Forecasts. As millions of our customers have discovered, NOAA RadarUS delivers everything you need in a app for viewing animated weather radar images. Want more? Check out these unique features in our app: • Choice of radar images with or without snow/freezing rain display • Hourly predicted radar from NOAA weather models • Choice of radar color schemes. • Clutter control to suppress false radar echoes. • Optional image smoothing that lets you either remove image pixellation or display the radar image as accurately as possible. • Composite images of echo tops, composite reflectivity, and storm total precipitation. Want the whole story? Here are all of the features: • 7 day forecasts and current conditions -- just press and hold for a second on the radar map. • Severe weather (flash flood, tornado, and severe thunderstorm) warnings. Tap on a warning box to display the full warning message from the National Weather Service. Note: these are *not* push alerts. The app must be open to view the warnings. • Cloud cover and satellite imagery for the continental United States. • Advanced radar layers (echo tops, composite reflectivity, and storm total precipitation). • Play, pause, and step animations. • Fast zoom in and zoom out. • Choice of radar palettes. • Multiple map styles (terrain, map, satellite, and hybrid). • Displays time of radar image either as absolute time or relative to the current time. • GPS locator that finds and displays your current location. • Adjust the transparency (opacity) of the radar or cloud cover overlays. • Automatic refresh when new radar or cloud cover data is available. • Set your location by zip code, city name, or address. • Legend for radar and cloud cover overlays. • Saves and restores your last location and zoom level. Note: Radar coverage only includes the continental United States. Alaska, Hawaii, and other US controlled territories are not included. Support: Please follow our Twitter stream at twitter.com/shuksansoft for breaking news and status updates.
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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-native-maps
Supabase
zustand
@react-navigation/native
BUILD KIT DIFFICULTY
Advanced
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.
