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 & Tides: Marine Forecasts
Marine weather for 14 regions on the US West and East Coasts: California, Washington, Long Island Sound, and Maine
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
408 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.
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 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 Wind & Tides: Marine Forecasts: 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 custom alerts for specific weather conditions.
Assumption to check: Limited customization options for notifications
Validate with people who use this workflow before building.
Hypothesis 2
Implement loading indicators and caching strategies for a smoother experience.
Assumption to check: Inconsistent data loading times
Validate with people who use this workflow before building.
Hypothesis 3
Add offline functionality to view previously fetched data.
Assumption to check: No offline mode
Validate with people who use this workflow before building.
Hypothesis 4
Enhance UI with more modern design patterns and animations.
Assumption to check: Basic UI design
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
Marine weather for 14 regions on the US West and East Coasts: California, Washington, Long Island Sound, and Maine. If your region isn't listed below, hold off — more are in development. NOAA nautical charts, forecasts, currents, tides, and local conditions for boating, sailing, fishing, kayaking, paddleboarding, windsurfing, wing foiling, kiteboarding, and open water swimming. SUPPORTED REGIONS • San Francisco Bay • San Francisco Offshore • Monterey Bay • Santa Barbara • Catalina and Channel Islands • Los Angeles • San Diego • Puget Sound • San Juan Islands • Port Angeles • Port Townsend • Long Island Sound West • Long Island Sound East • Portland Maine and Casco Bay DATA SOURCES • NOAA ENC nautical charts — depths, hazards, buoys, channel markers • NOAA / NWS marine zone forecasts • NOAA tide predictions • NOAA current predictions • NDBC live buoy observations • NWS gridded weather forecasts No account required. No ads. Wind and Tides surfaces public NOAA, NWS, and NDBC data and is not affiliated with these agencies. Don't see your region? Request it at windandtides.com.
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
victory-native
react-query
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.
