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
Acme Weather
Acme Weather, from the creators of Dark Sky
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
2,901 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 included18 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 Acme Weather: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Acme Weather, from the creators of Dark Sky. Our homegrown forecasts help you make better decisions about your day. * Alternate Predictions Weather is unpredictable, and forecasts are often wrong. Instead of a single guess, Acme displays alternate predictions that show you how reliable the forecast is and the range of possible outcomes. * Notifications Never miss important weather again. Acme has notifications for precipitation, severe weather, lighting, daily summaries, and more. Want to know if it'll be windy or if the UV index will be high? Create custom notifications for the conditions you care about. * Community Reports There’s nothing more reliable than when someone nearby tells you what’s happening. Acme lets anyone report what they’re seeing, maps it instantly, and alerts you when something’s happening close by. * Beautiful Maps Our maps include real-time radar, snow accumulation, air quality, hurricanes and more. The most relevant map will appear directly in your forecast page for instant context. * Subscription Acme is free to use for two weeks, then requires a $25 USD/year subscription. A Family Sharing subscription is also available for $50 USD/year. * Privacy First - We collect only what’s necessary to provide the service - We don’t store your location history - We don’t sell your data - We don’t use third-party tracking or analytics tools Terms of Use: https://acmeweather.com/terms Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Written user reviews are not shown here. Check current App Store reviews >
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 multiple data sources for increased accuracy
Assumption to check: Inaccurate weather data can frustrate users
Validate with people who use this workflow before building.
Hypothesis 2
Create an ad-free subscription model
Assumption to check: Ad-heavy interfaces detract from user experience
Validate with people who use this workflow before building.
Hypothesis 3
Add customizable severe weather alerts
Assumption to check: Lack of personalized notifications for severe weather
Validate with people who use this workflow before building.
Hypothesis 4
Enhance features like radar and air quality index
Assumption to check: Limited features compared to competitors
Validate with people who use this workflow before building.
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
Axios
React Navigation
Supabase
React Native Maps
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.
