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
PLEASE NOTE: THIS APP REQUIRES A SUBSCRIPTION
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 5.0
2 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 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 Windsock: 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 set specific weather alerts based on preferences.
Assumption to check: Limited customization options for notifications
Validate with people who use this workflow before building.
Hypothesis 2
Enhance location accuracy features with better GPS integration.
Assumption to check: Inaccurate location-based data in some areas
Validate with people who use this workflow before building.
Hypothesis 3
Introduce caching for the last known weather data.
Assumption to check: No offline access to weather data
Validate with people who use this workflow before building.
Hypothesis 4
Provide in-depth analysis and historical data for users.
Assumption to check: Lack of detailed weather insights
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
PLEASE NOTE: THIS APP REQUIRES A SUBSCRIPTION. ENJOY A FREE TRIAL BEFORE YOU COMMIT! -- WHY WINDSOCK? Windsock is an advanced weather app for professional fliers of drones and other UAVs. As a pro perhaps you've already found that packing the flight gear and driving down to the flying location only to find it's too windy to fly can be frustrating. Instead, use these tools get comprehensive reports on the latest flight conditions for a nearby location so you can feel confident that it's great weather at sunset for flying or even if it's great right now - find those perfect flying weather windows and fly smarter! PREMIUM DATA Get access to premium data that uses the power of satellites, radar and local weather stations all over the world to deliver advanced wind and condition forecasts for your favourite drone flying sites. Let's be clear, this isn't one of those basic freebie weather apps! Windsock tracks over 17 forecast metrics from multiple aggregated data sources. Forecasts are up to 10 days in advance with high-resolution forecasts every hour on demand for almost anywhere in the world. ===== POWERFUL YET EASY TO USE 17 forecast metrics - displayed in 5 easy to understand data panels - summary, visibility, air, precipitation and satellite. LOCAL SITES Grab forecasts for your current location without even having to add it as a site. ADVANCED AUDIBLE REPORTS Generate a full audible report of the current conditions and have it read out to you hands-free, just shake your device if you have location enabled. DAYLIGHT REMAINING Quickly find out when sunset is so you know exactly how much daylight you have remaining. FLIGHT REQUIREMENT RULES Create flight condition rules and get tick marks next to flight conditions that match. Great for visual scanning! RANGE AND DISTANCE MAPPING TOOLS Quickly work out ranges and distances BATTERY CALCULATOR Get estimates of theoretical charging times and limits PRINTABLE GRAPHS Wind graphs are just a touch away and can even be printed using AirPrint. 1 WEEK FREE TRIAL Not sure Windsock covers your area? Try it for a week for free. See inside the app for details. Terms of use: https://windsock-app.com/terms
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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.
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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.
