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
DuffMate: Golf Shot Tracker
"Was that a 6 or a 7!?" - DuffMate has you covered.
$5.99 · In-app purchases
PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
4 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 included18 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 DuffMate: Golf Shot Tracker: 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
Add more detailed analytics and customizable tracking options.
Assumption to check: Limited features compared to other sports tracking apps.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a cleaner, more organized layout.
Assumption to check: User interface may feel cluttered.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce social features to connect with friends.
Assumption to check: Lacks community features for sharing scores.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to save scores offline and sync when back online.
Assumption to check: No offline functionality.
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
"Was that a 6 or a 7!?" - DuffMate has you covered. "My cart doesn't have a GPS screen!" - DuffMate has that one covered, too. DuffMate counts your golf shots. Full swings are detected automatically — so you can keep your focus on your golf round. Wear your Apple Watch. Swing. DuffMate feels the motion and logs the shot. Tap in your putts and the score is recorded. Your iPhone stores your stats, replays your round, and now shows a live satellite GPS view of the hole you're playing — or lets you preview any course before you tee off. WHAT DUFFMATE DOES • Automatic shot detection — Developed by a fighter aircraft flight control designer with a wife learning the game, the Watch's motion sensors recognize the golf swing and does the counting. Adjustments are made with a quick tap. • Live GPS on your iPhone — a satellite view of the hole you're playing, front/center/back yardages, and tap-to-measure distance to anywhere on the map. Works for the round in progress or to scout a course ahead of time. • GPS distance to the green — yardage to the front, middle, and back on every hole. Distance from your last shot is provided, a big help for learning club distances. • Live wind — speed and direction to the hole on your wrist before you pick a club. • Putts, your way — tap to log putts separately from your shots. Turn them off if you'd rather not track them. • Real-time sync — your scorecard and shot history update to your iPhone as you play, hole by hole. • Scorecard & shot map — after the round, see your full scorecard with saved driving distances on par 4/5's. A satellite map shows where each full shot was taken. • Stats & personal bests — round history, scoring trends, best rounds, and personal records, all on your phone. WHAT YOU NEED An Apple Watch and an iPhone. No extra sensors, no extra gadgets, no subscriptions. YOUR PRIVACY Your rounds live on your iPhone and Watch. There are no accounts to create, no data sold, and no tracking. DuffMate reaches out for two things only: weather data for your round, and looking up your course. That's it. --- DuffMate is made for golfers who want to devote more focus to their round and less focus on counting strokes. And oh by the way - the app has features that the low handicappers depend on.
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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-native-chart-kit
react-navigation
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.
