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
Hand and Foot Calculator
A utility application for scoring your Hand and Foot card games
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.3
86 ratings · Below Average
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 Hand and Foot Calculator: map the core Utilities 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 a more detailed history section with filter options.
Assumption to check: Limited score history visibility
Validate with people who use this workflow before building.
Hypothesis 2
Clarify the benefits of the paid version and simplify the purchasing process.
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 3
Enhance the UI with better visuals and user-friendly elements.
Assumption to check: Basic UI design
Validate with people who use this workflow before building.
Hypothesis 4
Add a feedback section for users to report issues or suggest features.
Assumption to check: No user feedback options
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
A utility application for scoring your Hand and Foot card games. The scoring options are configurable. The default configuration is: - Going out is 100 points. - Red threes that are played are worth 100 points. A canasta of red threes has a bonus of 1000 points (for a total of 1700+ points) - Unplayed red threes are -500, and accounted for during card count. - A canasta of wild cards counts for 1500 points. - A canasta of sevens counts for 1000 points. - A "Natural" canasta (a canasta without wildcards) counts for 500 points. - A "Mixed" canasta (a canasta with wildcards) counts for 300 points. - Cardcount: cards are counted and the value is entered as a number in the cardcount row. There are 5 rounds: - Round 1: 50 points is needed to meld - Round 2: 90 points is needed to meld - Round 3: 120 points is needed to meld - Round 4: 150 points is needed to meld - Round 5: A canasta is needed to meld Game can be played by 2, 3, 4 (teams of 2) or 6 (teams of 2) players. - The value for going out can be configured. - If red threes are playable, what their value is, and if a bounus for a canasta of red threes is applicable. - If a canasta of wild cards is "special", what is it's value. - If a canasta of sevens is "special", what is it's value. - The value of a natural canasta. - The value of a mixed canasta. - Include the 5th (canasta meld) round, or only 4 rounds.
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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
React Navigation
Axios
React Native Paper
TypeScript
BUILD KIT DIFFICULTY
Starter
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.
