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
CrownCards - Trading Cards
Pull genuine trading cards from your phone
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 4.7
4,756 ratings · Top 15%
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/
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 CrownCards - Trading Cards: map the core Games 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
Broaden the card selection and introduce more trading mechanics.
Assumption to check: Limited trading options and card variety
Validate with people who use this workflow before building.
Hypothesis 2
Implement a social feed for users to share trades and collections.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 3
Add a system to reward users for completing sets or trading.
Assumption to check: No rewards or achievements system
Validate with people who use this workflow before building.
Hypothesis 4
Establish clearer guidelines for card quality and a rarity classification system.
Assumption to check: Inconsistent card quality and rarity
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
Pull genuine trading cards from your phone. Build your collection or ship the real card home. Crown Cards is a digital pack-opening experience built around real collectibles. Every card in every pack is a genuine trading card, from popular TCG singles to graded slabs and rare chase cards every card's market value is listed before you open. No mystery on what a pull is worth. Just the thrill of the reveal, and your choice of what to do next. How it works 1. Pick a pack. Browse packs with clearly labeled card pools, rarity tiers, value ranges, and pull rates. Pick the one matching the chase you're after. 2. Open and reveal. Watch each card turn one by one. You might pull everyday collectibles, sought-after singles, professionally graded slabs, or a rare hit. 3. Decide per card. Two options for every card you pull: - Collect and keep it in your in-app collection - Ship it, request physical delivery of the real card Real cards, real values Every card available in Crown Cards is a genuine, physical collectible. Listed values are tied to market data so you understand exactly what you pulled and what it's worth in the wider collecting market. Physical shipping Want to hold the real thing? Request delivery and we'll ship your selected cards to your address with secure, tracked handling.
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
Firebase
Redux
React Navigation
Axios
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.
