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
1/ST BET: Horse Race Betting
Bet live races with speed and precision
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
1,188 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.
Build your own version
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 included15 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 1/ST BET: Horse Race 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
Implement guided onboarding to familiarize users with navigation.
Assumption to check: In-app navigation is confusing for new users
Validate with people who use this workflow before building.
Hypothesis 2
Provide more detailed race analytics and a wider variety of betting types.
Assumption to check: Limited betting options and race information
Validate with people who use this workflow before building.
Hypothesis 3
Optimize data fetching and display updates more efficiently.
Assumption to check: Slow loading times for live updates
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate social sharing options to enhance user engagement.
Assumption to check: Lack of social features for sharing bets
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
Bet live races with speed and precision. Watch, analyze, and wager in real time with a platform built for serious horseplayers. 1/ST BET gives you everything you need to handicap, track odds, and place bets—fast. Stream live horse racing, access powerful data, and execute wagers instantly from anywhere. Watch Live & Bet in Real Time • Stream live horse racing from top tracks worldwide • Bet instantly with real-time odds and updates • Access replays, results, and past performances • Built for speed when every second counts Advanced Handicapping Tools • FREE personalized handicapping tools • Top Stats Tool: projected Win, Place, and Show probabilities for every horse • Data-driven insights powered by advanced algorithms Evaluate every race using the factors that matter: • Speed figures and performance trends • Trainer and jockey stats • Running style and pace • Strength of competition • Pedigree and overall fitness Focus on the data that moves the odds. Built for Performance • Streamlined betting experience for faster execution • Real-time updates to stay ahead of late movement • Designed for reliability on major race days Fast Funding & Payouts • Deposit with PayPal, bank transfer, credit card, and more • Secure transactions with fast payouts when you win Bet the Biggest Races • Kentucky Derby • Preakness Stakes • Belmont Stakes • Breeders’ Cup • Pegasus World Cup Top Tracks. Full Coverage. • Gulfstream Park • Santa Anita Park • Churchill Downs • Saratoga • Belmont Park • Del Mar • Keeneland • Oaklawn Park • And more Watch and bet on live horse races from anywhere. States where 1/ST BET horse wagering services are available: Alabama, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Montana, Nebraska, New Hampshire, New Mexico, New York, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Dakota, Tennessee, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming. Offer valid for new and eligible returning users. Earn $20 in bonus bets for every $100 wagered, up to $200, within the first 60 days. Bonus bets are non-withdrawable and expire after 14 days. Terms apply. Must be 18+ (21+ in AZ, IA, KS, TX, WA; 19+ in NE) and located in a state where wagering is legal. Void where prohibited. If you or someone you know has a gambling problem, call 1-800-522-4700
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
Supabase
Zustand
React Navigation
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.
