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
Windguru Spots: Wind Forecasts
Check Windguru forecasts for all your sailing and surfing spots — instantly, without the noise.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
11 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 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 Windguru Spots: Wind Forecasts: map the core Productivity 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 better sourcing of weather data.
Assumption to check: Lack of accurate forecasts for specific locations
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to set preferred measurement units and notifications.
Assumption to check: Limited user customization options
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing options for wind forecasts.
Assumption to check: No social features to share forecasts
Validate with people who use this workflow before building.
Hypothesis 4
Ensure a consistent design language throughout the app.
Assumption to check: Inconsistent UI/UX across screens
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
Check Windguru forecasts for all your sailing and surfing spots — instantly, without the noise. Add your spots once, then open the app to see live wind, gust, and swell forecasts without manually navigating to Windguru. Built for kitesurfers, windsurfers, surfers, and sailors who check conditions daily. FEATURES • Save up to 20 spots with custom names • Organize spots into groups (by region, session type, or season) • Reorder spots and groups with drag-and-drop • Choose your forecast model (WG, GFS, ECMWF, and more) • Customize forecast parameters: wind speed, gusts, direction, waves • Full dark mode support • Available in English, Spanish, French, German, and Portuguese • Back up and restore your spots via JSON export/import HOW IT WORKS 1. Tap "+ Add" and enter a spot name and Windguru spot ID (find it in the Windguru URL, e.g. windguru.cz/48743). 2. Or use in-app search to find spots by name. 3. Open the app anytime to see your forecast widgets — all in one scroll. Note: Windguru Spots is an independent app that uses Windguru widgets and links to Windguru content.
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
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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.
