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
WindRouter: Sailing Weather
WindRouter is the sailing weather router you buy once - no subscription, ever.
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 WindRouter: Sailing Weather: map the core Navigation 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
Implement offline map downloads and caching.
Assumption to check: Navigation apps often have poor offline support.
Validate with people who use this workflow before building.
Hypothesis 2
Use multiple data sources for weather accuracy.
Assumption to check: Weather accuracy can vary widely.
Validate with people who use this workflow before building.
Hypothesis 3
Provide clear subscription options with a trial period.
Assumption to check: In-app purchases can be confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Offer advanced routing options with traffic updates.
Assumption to check: Routing can be limited in feature set.
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
WindRouter is the sailing weather router you buy once - no subscription, ever. Most apps charge every year: PredictWind $249/yr, Savvy Navvy $99/yr, Navionics ~$50/yr. WindRouter is a single purchase you own for life - all features included, no add-ons. EVERYTHING INCLUDED - Unlimited isochrone weather routing across multi-day forecasts (GRIB / Open-Meteo / NOAA) - 15+ built-in boat polars plus custom polar import & editing - Departure-time comparison - find the best window to leave - NMEA 0183 instruments + B&G / Raymarine chart-plotter link - Live wind, wave & pressure forecasts on charts with OpenSeaMap & NOAA overlays THE CRUISER'S PLAYBOOK, BUILT IN - 20 ready-made ocean passages: the ARC, Biscay, Azores, the Coconut Milk Run, Caribbean & Mediterranean routes - 200+ curated anchorages and country guides - Draw a route with distance, bearing & waypoints - Import GPX and Navionics USR files - Digital logbook BUILT FOR THE CRUISER PLANNING THEIR NEXT PASSAGE Whether it's your first Biscay crossing, an Atlantic ARC, the Azores, or a season in the Med, WindRouter gives you pro-grade routing (isochrones, VMG, ECMWF-class weather) with a clean, modern interface - without the steep learning curve or the yearly bill. One payment. Yours forever. For passage planning only. Always carry official charts and approved navigation equipment.
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
react-navigation
react-native-maps
Victory 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.
