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
Windsock: Wind and Weather
The first Windsock with real effects.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.1
13 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 included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Windsock: Wind and 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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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
Enhance wind data accuracy and add more detailed wind metrics.
Assumption to check: Limited data on wind conditions compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate push notifications for severe weather alerts.
Assumption to check: No severe weather alerts feature
Validate with people who use this workflow before building.
Hypothesis 3
Provide options for users to customize the UI and themes.
Assumption to check: Basic user interface without customization options
Validate with people who use this workflow before building.
Hypothesis 4
Allow integration with smart devices for real-time weather updates.
Assumption to check: Lack of integration with smart devices
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
The first Windsock with real effects. With an innovative design, inspired by the real one, this App blends the concept of the Windsock with that of the compass, resulting in the direction and speed of the wind integrated in the compass. Wherever you are, Windsock gives you the direction and speed of the wind. Search for new locations and they will automatically be added to your favorites. Make sure you have activated the location services on your device, at this point the App will detect your geographical position. The data is provided by weatherstack.com [Features] - Wind direction - Wind speed - Compass - Wind effect - Choice of 5 units of measurement: knots, mph, km/h, m/s or beaufort - Search City (without limits) - Save favorite places (without limits) - Reliability in its use (data from weatherstack.com) - Intuitive graphics - Ease of use [Support] If you need help, do not hesitate to contact us at [email protected], or visit our official website www.lionsapp.com If you like the App, don't forget to give us a comment on the App Store.
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
Axios
Zustand
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react-native-maps
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.
