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
CardGenie - Sports Cards
With CardGenie you can easily keep track of your entire sports card collection including Baseball, Basketball, Football, Soccer, Golf, Pokemon, UFC, Nascar, and Hockey cards
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
485 ratings · Top 30%
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 CardGenie - Sports Cards: 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
Focus on building a robust user community and support forum.
Assumption to check: Limited community support for niche apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement advanced filtering and sorting options for better usability.
Assumption to check: Difficulties in managing large collections
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription model and clearly communicate benefits.
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 4
Introduce social sharing and trading features to enhance user interaction.
Assumption to check: Lack of social features for trading
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
With CardGenie you can easily keep track of your entire sports card collection including Baseball, Basketball, Football, Soccer, Golf, Pokemon, UFC, Nascar, and Hockey cards. Keep digital copies of all your cards so you can access them anytime and check player stats, eBay completed sales, PSA population reports, and much more! With this latest version we added a Basketball, Baseball, Soccer, Pokemon, and Football Card Price index tracker that helps see if the market is moving up or down and tracks weekly movement. For more information on how the index works check out our tutorial on youtube! We also recently added the ability to export your collection to excel and built a full profit tracker to keep track of your sales and percent return. Why are you waiting? Start making money investing in Sports Cards today!! I'm an avid collector and developed this to be a tool to get the most out of your collection. If you have any feature requests please send them in and we will do our best to implement them!
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
TypeScript
Zustand
React Navigation
BUILD KIT DIFFICULTY
Intermediate
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.
