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
4NJBets - Horse Racing Betting
From the #1 Horse Racing Network comes America’s very first legal horse racing betting app for New Jersey horse betting fans
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
8,938 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
Make this idea yours
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 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 4NJBets - Horse Racing Betting: 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 betting options to include more races and types of bets.
Assumption to check: Limited betting options and race selection
Validate with people who use this workflow before building.
Hypothesis 2
Enhance onboarding experience with guided tutorials.
Assumption to check: User onboarding can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Optimize app performance for better speed and responsiveness.
Assumption to check: Performance issues during peak times
Validate with people who use this workflow before building.
Hypothesis 4
Introduce social sharing options for users to discuss bets.
Assumption to check: Lack of social 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
From the #1 Horse Racing Network comes America’s very first legal horse racing betting app for New Jersey horse betting fans. Get horse betting picks and bet on horse races at over 150 tracks, including Del Mar Thoroughbred Club, Santa Anita Park, Gulfstream Park, Churchill Downs, Saratoga Racecourse, Keeneland Race Course, Monmouth Park, Belmont Park, Arlington Park, and more! Bet effortlessly and live stream horse races from the most popular horse racing tracks around the globe - gain exclusive insider access to 4NJBets handicapping info – watch races broadcasted in stunning HD live from the track – and most importantly, PLAY TO WIN! Live streaming for ALL 150+ tracks Exciting promotions Free race replays and past performances Free Race Alerts Improved handicapping store Seamless funding and withdrawals Free HD Streaming of FanDuel TV Networks TVG talent picks With the 4NJBets app, you’re never far from the action and securing that next big payday. Pick your favorite horse, watch them blow away the competition, and cash out securely. Our free app has you covered. Set race alerts for the Kentucky Derby, Preakness, Belmont Stakes, and the Breeders Cup Festival, or browse our presenters’ top picks. 4NJBets covers the most exciting events in horse racing! Don’t miss out on the fun including unforgettable events from Saratoga like the Travers Stakes, not to mention all the action at Del Mar like the Pacific Classic! Download the app now! Bet online in NJ today! Supports 150+ tracks including: Del Mar Thoroughbred Club, Santa Anita Park, Gulfstream Park, Saratoga Racecourse, Keeneland Race Course, Monmouth Park, Belmont Park, Arlington Park, and more! ------ Questions? You’ll find all the answers in our FAQ’s page: https://support.tvg.com/s/ 4NJBets: https://4njbets.us.betfair.com/ Full Terms and Conditions: https://4njbets.us.betfair.com/info/termsandconditions Privacy Policy: https://4njbets.us.betfair.com/info/privacypolicy Contact Us: [email protected] FanDuel TV is America’s #1 Horse Racing Network and TVG is the Largest Legal Horse Racing Wagering Site in America and proud sponsor of Del Mar’s TVG Pacific Classic. TVG is owned by Betfair, a global leader in online gaming. To access the app you’ll need a 4NJBets wagering account; you must be at least 21 years of age; a United States citizen or resident alien; a resident of a state where wagering services are available* and certify that the application information you provide is accurate. False statements made in regard to an application may subject the applicant to prosecution. TVG and 4NJBets will use the information provided by you and other data passively collected from you in our app for a variety of purposes as more particularly described in the 4NJBets Privacy Policy (available at https://4njbets.us.betfair.com/info/privacypolicy). For example, we use your information and data to complete your wager transactions and provide you with information such as to send you special offers or promotional and marketing materials. If you have questions about our information practices, please review the 4NJBets Privacy Policy or contact us at [email protected] AWARE – Always Wager Responsibly – National Gambling Helpline: 1-800-522-4700. *States where 4NJBets Mobile App wagering services are available: New Jersey Ideas/Concerns? We love to hear from our customers! Reach out at: [email protected]
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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
Axios
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.
