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
Sparrow - Golf
ELEVATE YOUR GAME
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
3,555 ratings · Top 15%
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 included19 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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Sparrow - Golf: 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
Integrate with popular golf course databases for easy score tracking
Assumption to check: Limited integration with third-party golf services
Validate with people who use this workflow before building.
Hypothesis 2
Add social features to share scores and achievements
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the upgrade process and clarify benefits of Pro subscription
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 4
Create a cleaner, more organized layout for easier navigation
Assumption to check: User interface can be cluttered
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
ELEVATE YOUR GAME Sparrow has the most advanced real-time A.I. swing analysis tech in the world! AI SWING ANALYSIS Sparrow auto-detects your swing in real time (you don't even have to press record!) and then provides you personalized feedback, instantly. DROP THAT HANDICAP Sparrow's swing advice is based on years of research on the biomechanics of the golf swing. You can compare your swing to a PGA Pro and have access to our extensive library of drill videos. SWING AT YOUR OWN PACE On the range, Sparrow automatically detects when you swing and you can swing up to 5 times in a row! TRACK YOUR IMPROVEMENT You can store your past swings to track your progress. See your SparrowScore go up as your swing improves! SOMETHING TO TELL US? Want to suggest a feature? Could something be working better? Connect with us at [email protected] SHARE YOUR FEEDBACK Love Sparrow? Give us a review in the App Store! Thanks. TERMS OF SERVICE https://www.sparrowup.com/tos
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.
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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.
