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
Caesars Racebook
Horse racing fans rejoice! Caesar has arrived, and he comes bearing gifts
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
632 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'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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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 Caesars Racebook: 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
Expand functionality to include live betting and more betting options.
Assumption to check: Limited features compared to desktop betting platforms.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the onboarding process and add tutorials.
Assumption to check: User interface can be overwhelming for newcomers.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize app performance to handle high traffic.
Assumption to check: Inconsistent performance during peak betting times.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate more payment methods for user convenience.
Assumption to check: Limited payment options for in-app purchases.
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
Horse racing fans rejoice! Caesar has arrived, and he comes bearing gifts. Get started with Caesars Racebook, and you’ll get a 100% Deposit Match (terms apply). Download the app and bet on your favorite races taking place all over the world, any time of day, right from the palm of your hand! Making deposits is quick, safe, and easy. ACH Bank Transfer • Credit/Debit Cards (Visa/Mastercard/Discover) • Green Dot MoneyPak • PayNearMe • Apple Pay • Withdrawal by Check Start betting and you’ll reap the best rewards in racing. With every wager you place, you’ll earn Caesars Rewards® Reward Credits® and Tier Credits. Reward Credits are your comps to use for bonus play, hotel stays, dining, show tickets, and more at all Caesars Rewards destinations and our network of Caesars Rewards partners! Caesars Racebook is the place to WATCH the action. Stream races LIVE in HD, view races and replays on-demand, and stay up to date with live shows. Download today and access over 300 tracks, including Del Mar, Saratoga, Gulfstream, Monmouth Park, Finger Lakes, Horseshoe Indianapolis, Eldorado Scioto Downs, Harrah’s Hoosier Park, Harrah’s Philadelphia, Yonkers Raceway and more! You can also wager and watch all the high stakes international races from Hong Kong, France, UK, Ireland, Australia, and many others – all on mobile or desktop. The Caesars Racebook App is ready. Download it! New user deposit match offer available. Min. wagering within 30 days required. Full terms at http://caesarsracebook.com. Must be 21 or older to open a wagering account and reside in a state where such activity is legal. Caesars Racebook app is now available on iOS in California, Colorado, Connecticut, Florida, Illinois, Indiana, Kentucky, Louisiana, Maryland, Massachusetts, Minnesota, Montana, New York, North Dakota, Ohio, Oregon, Pennsylvania, Virginia, Washington, West Virginia, and Wyoming.
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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
Supabase
React Navigation
React Native Reanimated
BUILD KIT DIFFICULTY
Expert
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.
