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.
If you are throwing a Derby Party*, or any horse racing based fundraiser or event where you want to accept bets and calculate winners, this is the App to use
$9.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Derby Party Phone: map the core Lifestyle workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Limited event customization options
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inadequate user engagement features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Difficult to send invitations
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of social sharing capabilities
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
If you are throwing a Derby Party*, or any horse racing based fundraiser or event where you want to accept bets and calculate winners, this is the App to use. Download common race data with horses and odds from the Internet, or enter your own race. Specify an optional house cut for a fundraiser or to cover your party. Add or modify horses and their odds, or mark a horse as scratched. Add or import bettors with an optional email address for distributing a payout summary. Bet types supported are: Win, Place, Show, Across the Board, Exacta, Trifecta, Exacta Boxed and Trifecta Boxed. Once the race has completed, enter the race results and calculate your payouts. The payout summary will specify all winning bettors with their payouts, as well as any fundraising house cut. Keep the calculations and data entry as simple as possible, and enjoy your Derby Party! Whether the horse race is in New York, California, Kentucky, England, France or Australia this App can help manage the data and calculations associated with the hypothetical betting pool so you can enjoy the party more. For a larger user interface, check out Derby Party for iPad. *NOTE - Derby Party is not an online gambling service. Derby Party performs the complex calculations for Win, Place, Show, Across the Board, Exacta and Trifecta style bets. Derby Party is owned and developed solely by Larson Development LLC, and not associated with any other organization. Larson Development affirms that Derby Party is solely a bet calculator designed for the calculation of hypothetical party pools, and is not associated with any horse race venue's app currently available for download or sale in the App Store. See also game Apps PipeBall and PipeBallPlus.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.