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
WinSlice
The jackpot is $217 million
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 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 WinSlice: map the core Finance 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
Implement automatic transaction categorization using AI.
Assumption to check: Users often find it hard to categorize transactions accurately.
Validate with people who use this workflow before building.
Hypothesis 2
Use gamification elements to engage users more.
Assumption to check: Lack of visual engagement in tracking goals.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate with a reliable service like Plaid for easy linking.
Assumption to check: Difficulties in linking bank accounts securely.
Validate with people who use this workflow before building.
Hypothesis 4
Provide detailed analytics and reports on spending habits.
Assumption to check: Limited insight into spending patterns.
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
The jackpot is $217 million. After federal taxes, state taxes, and the lump sum reduction, you might take home less than half. WinSlice shows you exactly how much. TAX CALCULATOR Instant federal and state tax breakdown for Powerball, Mega Millions, and local games. See your real take-home in seconds. COMPARE ALL 50 STATES See how much you'd keep in every state, ranked from best to worst. Some states take nothing. Some take over 13%. LIVE RESULTS Latest winning numbers with two live countdowns, when ticket sales close and when the next drawing happens. LUCKY NUMBERS Quick Pick and Manual Pick for Powerball, Mega Millions, and local games. For entertainment only. YOU'VE WON, NOW WHAT? A 10-step winner's guide for the critical first 72 hours. Sign your ticket. Tell nobody. Hire an attorney first. No account required. No subscription. No ads. $2.99 one-time.
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
Shadcn/UI
React Navigation
Zustand
BUILD KIT DIFFICULTY
Intermediate
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.
