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
DoubleDown™ Casino Vegas Slots
Casino action and Vegas jackpot thrills are free—and right at your fingertips!—in the world’s biggest social casino app
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
571,726 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 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 DoubleDown™ Casino Vegas Slots: map the core Games 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 user-friendly ad placements and rewards.
Assumption to check: Frequent ads disrupt gameplay
Validate with people who use this workflow before building.
Hypothesis 2
Offer more free spins or opportunities to win without in-app purchases.
Assumption to check: Limited free gameplay options
Validate with people who use this workflow before building.
Hypothesis 3
Create an onboarding tutorial to guide new users.
Assumption to check: Confusing navigation for new users
Validate with people who use this workflow before building.
Hypothesis 4
Optimize game loading times and stability.
Assumption to check: Inconsistent game performance
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
Casino action and Vegas jackpot thrills are free—and right at your fingertips!—in the world’s biggest social casino app. Win big on over 200 authentic Vegas slot machines, from 3-reel classics to the latest Las Vegas hits, and the same name-brand Video Poker, Blackjack, and Roulette you know and love from the casino floor. ► Top Las Vegas slots you know and love! ► Tons of free chips to play! ► Enter the High Limit Room for 2x Jackpots! ► Reap the rewards of loyalty in Diamond Club! Start the fun now with 1,000,000 free chips, and win your way to high roller action in the High Limit Room, where jackpots are doubled! Customize your experience by selecting your favorite slot games to get straight to the action every time—choose among our thrilling lineup of authentic blockbuster slot machines like Double Diamond™, Golden Goddess™, DaVinci Diamonds™, Wheel of Fortune® slots, and many more! The Vegas fun never stops at DoubleDown Casino, with exciting new slot games straight from the casino added all the time. Rekindle timeless thrills with your favorite classic slot machines, and discover the latest innovations casino fans are going wild for with exclusive IGT hit slots. Want more free chips? We give out free bonuses all day, every day! You’ll get top-shelf rewards in our new-and-improved loyalty program, Diamond Club. Take your free Daily Bonus spin, log in to Facebook to share gifts with friends, and follow us on social media to collect free bonus chips and keep the fun going! Like us on Facebook & collect frequent bonuses: https://www.facebook.com/doubledowncasino/ Internet connection required to play. DoubleDown Casino is intended for players 21 yrs+ and does not offer “real money gambling” or an opportunity to win real money or prizes based on the outcome of play. Playing DoubleDown Casino does not imply future success at “real money gambling.”
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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
react-navigation
@react-native-async-storage/async-storage
react-native-reanimated
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.
