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
Mustard Golf: Swing Analysis
Mustard Golf: Your Swing
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
931 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's included16 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 Mustard Golf: Swing Analysis: 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 comprehensive analytics and training drills.
Assumption to check: Limited swing analysis features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation and enhance onboarding.
Assumption to check: User interface can be overwhelming
Validate with people who use this workflow before building.
Hypothesis 3
Optimize video handling and buffering.
Assumption to check: Inconsistent video playback performance
Validate with people who use this workflow before building.
Hypothesis 4
Integrate more interactive community tools and discussions.
Assumption to check: Lack of community engagement features
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
Mustard Golf: Your Swing. Just Better. Mustard Golf will help you understand your swing and learn your most important areas of improvement. Mustard Golf's AI technology will elevate your game with real-time analytics and personalized instruction from the world's best coaches and athletes, including top PGA mental skills and short game coach Jason Goldsmith, PGA Tour pro Justin Rose, Golf Digest #1 Coach in the US Mark Blackburn, Golf Digest #8 Coach in the US Michael Jacobs, and others. Golf Swing Analysis & Coaching Simply upload a swing - either from your camera roll or within the app - and Mustard Golf will identify what you do well and what you need to improve. You'll get personalized coaching to improve your skills while tracking your progress over time, all for a yearly price that is less than the cost of just one in-person lesson. And because we know you don't have time to get to the range every day, many of Mustard's drills to reinforce better movement patterns can be done effectively at home! Privacy policy: https://teammstrd.com/privacy/https://teammstrd.com/privacy/ Terms of Use: https://teammstrd.com/terms/https://teammstrd.com/terms/
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
Zustand
Firebase
react-navigation
expo-sharing
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.
