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
GHIN: Handicap Index® & GPS
GHIN is the app built for golfers by the USGA — post scores, track your Handicap Index®, play with GPS, and see the stats that show how your game is trending
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
20,702 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.
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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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 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 GHIN: Handicap Index® & GPS: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
GHIN is the app built for golfers by the USGA — post scores, track your Handicap Index®, play with GPS, and see the stats that show how your game is trending. WHAT YOU CAN DO • Post scores and track stats — Update your Handicap Index by posting total or hole-by-hole scores, with the option to track fairways, greens in regulation, and putts. • Play a round with GPS: simplified setup, richer course graphics, one-handed scoring, or switch to a simple digital Scorecard if you'd rather skip GPS • See your game in the new Stats section: recent trends, score history, hole-by-hole, advanced stats, and course-specific performance • Set up and play fair matches against other golfers with a Handicap Index — including front nine / back nine / overall results • Compete on virtual leaderboards through Challenges, at select courses through your Allied Golf Association • Play hands-free — track your whole round right from your Apple Watch GETTING STARTED & UPGRADES • Start with a Free Trial: post 3 scores to get an Estimated Handicap Range, and continue posting for 30 days after that • Enhanced GPS is available as a premium upgrade — Green Maps and front/back yardages on your phone, plus hazard and layup yardages on Apple Watch. • Membership through an Allied Golf Association is required for full app functionality Terms of Service - https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy - https://www.usga.org/content/usga/home-page/Handicap-ghin/ghin-privacy-policy.html
Written user reviews are not shown here. Check current App Store reviews >
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 a user-generated course feature allowing users to add and share local courses.
Assumption to check: Limited course selection compared to local options
Validate with people who use this workflow before building.
Hypothesis 2
Create a clearer, more intuitive subscription management interface.
Assumption to check: Subscription management can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the UI by reducing the number of elements on each screen and improving layout.
Assumption to check: User interface can feel cluttered
Validate with people who use this workflow before building.
Hypothesis 4
Add an easy-to-navigate history section for viewing past rounds and scores.
Assumption to check: Difficulty in accessing past scores
Validate with people who use this workflow before building.
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.
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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.
