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
Wind Wheel
Navigate the vast oceans with precision and confidence using Wind Wheel, an indispensable tool for sailors and maritime enthusiasts alike
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
7 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.
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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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 Wind Wheel: 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 real-time updates and notifications for changing wind conditions.
Assumption to check: Inconsistent data updates for wind information
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize their map views and wind metrics.
Assumption to check: Limited customization options for users
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription model and provide clear value distinctions.
Assumption to check: Subscription fatigue with multiple pricing tiers
Validate with people who use this workflow before building.
Hypothesis 4
Offer downloadable maps for offline use.
Assumption to check: Lack of offline access to maps
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
Navigate the vast oceans with precision and confidence using Wind Wheel, an indispensable tool for sailors and maritime enthusiasts alike. Delve into the complexities of wind dynamics with ease, allowing you to fine-tune your course and speed with unparalleled accuracy. - Desired Wind: Generate optimal course and speed solutions for your preferred relative winds - True Wind: Determine the true wind conditions based on your vessel's course, speed, and observed relative wind - Relative Wind: Forecast shifts in relative wind before making adjustments to your course or speed - Condition Determination: Gauge wind intensity and anticipate conditions using the Beaufort Wind Force Scale Whether a seasoned mariner or a budding sea explorer, Wind Wheel is the perfect companion to help you harness the power of the wind. Set sail with confidence, chart your course, and let Wind Wheel handle the complexities of wind dynamics for you.
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
react-navigation
axios
react-native-maps
zustand
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.
