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
The Racing Rules by Elvstrøm
The Racing Rules app is your trusted companion for understanding sailing rules, whether you're just learning the basics or need to resolve a specific situation from a race.
$2.99 · In-app purchases
PRICE
$2.99
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
Make this idea yours
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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Make it yours Optional
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/
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 The Racing Rules by Elvstrøm: map the core Sports 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
Incorporate quizzes or interactive scenarios for users to test their knowledge of racing rules.
Assumption to check: Limited interactivity and engagement features
Validate with people who use this workflow before building.
Hypothesis 2
Add forums or discussion boards for users to share experiences and strategies.
Assumption to check: Lack of community features
Validate with people who use this workflow before building.
Hypothesis 3
Implement a better search and categorization system for rules and resources.
Assumption to check: Poor discoverability of content
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize their feed based on interests and experience level.
Assumption to check: No personalized content delivery
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
The Racing Rules app is your trusted companion for understanding sailing rules, whether you're just learning the basics or need to resolve a specific situation from a race. In celebration of the 60th anniversary of the Paul Elvstrøm Explains the Racing Rules series, we've brought the latest 2025–2028 edition to life in digital form. All the updated rules are presented with Elvstrøm’s iconic illustrations, offering clear, easy-to-understand guidance for sailors of all levels. The app is designed for clarity and speed, featuring a clean layout, powerful search, quick access to racing signals, and Part 2 diagrams. You can even save your most-used rules for fast reference, no more flipping through books or PDFs. Just open the app and sail smarter. Whether you're new to racing or a seasoned tactician, this app puts the rules, right in your pocket.
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
Supabase
Zustand
@react-navigation/native
react-native-gesture-handler
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.
