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
Rummy 500 - ScoreTracker
Rummy 500 Score Tracker makes game night effortless
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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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Combine features and design from your favorite apps.
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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 included14 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 Rummy 500 - ScoreTracker: 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 auto-fill and error checking for scores.
Assumption to check: Difficulty in score input, especially for multiple rounds.
Validate with people who use this workflow before building.
Hypothesis 2
Add graphical representations of scores over time.
Assumption to check: Lack of visual history representation.
Validate with people who use this workflow before building.
Hypothesis 3
Allow custom avatars or colors for players.
Assumption to check: Limited customization options for players' names.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate push notifications for game sessions.
Assumption to check: No notifications for game updates or reminders.
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
Rummy 500 Score Tracker makes game night effortless. No more scribbling on paper, losing track of points, or arguing over math. This simple, fast, and reliable scorekeeper is built specifically for Rummy 500 so you can focus on playing — not calculating. Features Quick scoring: Add points in seconds with a clean, intuitive interface Automatic totals: Let the app handle all the math for you Multiple players: Track scores for any size group History tracking: See previous rounds at a glance Error‑proof editing: Fix mistakes instantly Lightweight & fast: No accounts, no ads, no distractions Whether you’re playing casually or keeping a competitive tally, Rummy 500 Score Tracker keeps every game organized and fair. Perfect for game nights, family gatherings, or anyone who loves Rummy. Play more. Track less. Enjoy the game.
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
@react-navigation/native
Formik
React Native Share
React Native Async Storage
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.
