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
Lacrosse Scorekeeper
Lacrosse Scorekeeper is the ultimate sideline companion for coaches, parents, and fans who want to track every detail of a lacrosse game in real time.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 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 included17 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 Lacrosse Scorekeeper: 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
Include detailed player stats and game analysis features.
Assumption to check: Limited functionalities for advanced statistics tracking
Validate with people who use this workflow before building.
Hypothesis 2
Implement a cleaner, more organized UI design.
Assumption to check: User interface may feel cluttered
Validate with people who use this workflow before building.
Hypothesis 3
Add cloud storage for user data and game history.
Assumption to check: No cloud synchronization for game data
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate sharing options for game results and player stats.
Assumption to check: Lack of social sharing 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
Lacrosse Scorekeeper is the ultimate sideline companion for coaches, parents, and fans who want to track every detail of a lacrosse game in real time. **Live Scoring Made Simple** Use the jersey number keypad to instantly record goals, assists, saves, ground balls, turnovers, and more - all with a single tap. The split-screen layout keeps the action moving without fumbling through menus. **Real-Time Game Clock & Penalties** A full game clock counts down each period with automatic overtime support. Active penalties display live countdowns right in the scoreboard header, so you always know when your team is man-up or man-down - with EMO notifications to keep you in the game. **Comprehensive Player & Team Stats** Track individual player performance across every game: goals, assists, shots, shot percentage, ground balls, face-off wins, saves, and more. View season-wide team statistics including win/loss record, clear success rate, and possession stats. **Detailed Game Summaries** Review completed games with full event timelines broken down by quarter, penalty summaries, and scoring breakdowns for both teams. **Built for the Sideline** - Large, touch-friendly buttons designed for outdoor use - Auto-save every 10 seconds so you never lose data - Haptic feedback confirms every action - Dark-themed interface reduces glare in bright sunlight - Works entirely offline - no internet required Whether you're a coach breaking down film, a parent keeping the book, or a fan who wants more than just the final score - Lacrosse Scorekeeper has you covered.
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
react-navigation
react-native-paper
expo-notifications
BUILD KIT DIFFICULTY
Starter
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.
