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
Injury Finder
What is injury prone? The Injury Finder leverages PlayerProfiler’s expansive database and predictive analytics firepower to determine injury probabilities
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
4 ratings · Top 30%
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 Injury Finder: 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 advanced filtering and sorting options for better user experience.
Assumption to check: Limited player search options and filters
Validate with people who use this workflow before building.
Hypothesis 2
Implement real-time alerts and notifications for users.
Assumption to check: Infrequent updates on injuries
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the UI design for improved readability and navigation.
Assumption to check: User interface can be cluttered
Validate with people who use this workflow before building.
Hypothesis 4
Provide comprehensive player profiles with stats and history.
Assumption to check: Limited information on players
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
What is injury prone? The Injury Finder leverages PlayerProfiler’s expansive database and predictive analytics firepower to determine injury probabilities. The app determines the likelihood that a skill position player is injured on any give touch as well as the likelihood that the player misses multiple games due to injury during the regular season. Injury Predictions (In-app Purchase): Why is Christian McCaffrey more likely to miss games than other NFL skill position players? Using a player’s physical attributes, projected usage and injury history, Injury Finder determines the chances that a player misses multiple games or is injured on any given dropback, carry or reception. — Fragility Comparison Center: Challenge injury prone narratives with Injury Finder’s interactive player comparison tool, which compares injury histories, fragility ratings, and injury probabilities back through time. — Mobile Database: Access a detailed injury history on hundreds of players stretching back 10+ NFL seasons. Mine data to better understand league-wide injury trends by position, by body part, by type and severity.
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
Axios
React Navigation
TypeScript
Zustand
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.
