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
TwinSpires: Triple Crown 2026
Live Horse racing with the TwinSpires Horse Racing Betting, is the premier destination for legal US horse racing bets on race day
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
88,715 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
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A product spec, screen plans, and build steps for your coding agent.
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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 TwinSpires: Triple Crown 2026: 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
Include more diverse betting types and events.
Assumption to check: Limited betting options compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation and improve onboarding experience.
Assumption to check: User interface can be confusing for new users.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize app performance and load times.
Assumption to check: Performance issues during high traffic events.
Validate with people who use this workflow before building.
Hypothesis 4
Implement in-app chat support or FAQ section.
Assumption to check: Lack of customer support 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
Live Horse racing with the TwinSpires Horse Racing Betting, is the premier destination for legal US horse racing bets on race day. Bet online on racetracks such as (Saratoga) Traver Stakes, (Del Mar) Pacific Classic Stakes & more all year! You can legally wager and bet online on the finest daily horse racing on the planet – including Pacific Classic Stakes – every racetrack worldwide, Saratoga, Del Mar, Keeneland and more to choose from on the best horse racing betting app you can find! • FAST Wager Pad – construct multi-leg wagers on a single screen • Live programs with up to the minute racing info, results, and race day news • LIVE STREAMING of today’s race day action & video replays • Safe & secure funding and withdrawals • FREE HANDICAPPING information • Weekly bonuses, promotions & giveaways • Race day free picks and expert analysis Start betting online now by downloading TwinSpires for FREE and enjoy racetracks like (Saratoga) Traver Stakes, (Del Mar) Pacific Classic Stakes & more all year! If you love horse racing betting & want to bring the experience of the racetrack, (Del Mar, Keeneland) wherever you go, then download now! What are people saying about TwinSpires? "TwinSpires is the best horse racing betting app out there. I use it for the Belmont Oaks, Santa Anita Gold Cup & Kentucky Derby mainly. The interface is so user-friendly and easy to navigate. I've tried other apps like TVG and TrackWiz but I always come back to TwinSpires.” – Darren F "I've been using TwinSpires for horse betting for a while now and I'm really impressed. The app is well designed and offers a great selection of races to bet on in Louisiana Derby & the Belmont Oaks. I've tried TVG and DRF, but TwinSpires is by far the best." – Clive L "TwinSpires has changed the game for horse racing betting. The app is packed with features and offers a wide variety of races to bet on. The odds and payouts are always competitive, I’ve won at Belmont Park and Santa Anita Park. I've tried other apps like TrackWiz, DRF & TVG, but TwinSpires is the clear winner." – Jane V "TwinSpires is the ultimate horse racing betting app. It has everything you need to place your bets and keep track of your winnings. They have the best parlays, so much that I won on the Arkansas Derby and on the Belmont Stakes. TwinSpires is the best." – Deborah A Help and Support: If you require any assistance, please contact us: - Email: [email protected] - Call: 1-877-SPIRES-1 (1-877-774-7371) - Or Live Chat and access FAQs here: http://www.twinspires.com/support - For more information, visit: https://www.twinspires.com/twinspirescom-launches-new-smartphone-app - Privacy Policy: https://www.churchilldownsincorporated.com/privacy-policy/ To use this app you’ll need a TwinSpires account. You must meet state requirements for age; you must be a United States citizen or resident alien; and you must be a resident of a state where wagering services are available* and certify that the application information you provide is accurate. False statements made regarding an application may subject the applicant to prosecution. This is a real-money gambling app. Please gamble responsibly and only bet what you can afford. For gambling addiction help and support, please call 1-800-GAMBLER / 1-800-522-4700, or visit https://www.ncpgambling.org. Must be at least 18+ years or older (21+ where applicable).
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.
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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.
