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
Rare Candy: TCG Card Scanner
Scan cards, track your collection, and open Instapacks to reveal real trading cards with Rare Candy.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
11,132 ratings · Top 5%
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.
Build your own version
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 Rare Candy: TCG Card Scanner: map the core Reference workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Scan cards, track your collection, and open Instapacks to reveal real trading cards with Rare Candy. SCAN YOUR CARDS Identify raw and graded cards with your camera. Scan supported English and Japanese cards, check card details, and add your finds to your collection. OPEN INSTAPACKS Open curated digital packs and reveal real trading cards instantly. Keep your cards in your Vault, have them shipped to you, or exchange eligible cards for Candy credit. Explore available packs and find your next addition. TRACK YOUR COLLECTION Organize your cards in digital binders, follow master set progress, and manage your wishlist. Keep your collection updated as you scan. SEE MARKET VALUES Follow collection value and card-level price movement over time. Compare cards and use recent market data to inform your collecting decisions. Market values are estimates and vary with condition and available sales data. COMPARE RAW AND GRADED VALUES Grade Worthy compares raw and graded prices to help you prioritize cards for potential grading. It is a price comparison tool, not a guarantee of a card's grade or future value. SHOP VERIFIED LISTINGS Browse verified sellers, singles, sealed products, auctions, pre-orders, and new drops. JOIN THE COMMUNITY Share binders, show off your pulls, follow creators, and see what other collectors are building. Create an account to get started. Instapacks and marketplace purchases are paid. Terms and Conditions: https://rarecandy.com/terms Privacy Policy: https://rarecandy.com/privacy Support: [email protected] Instagram: https://www.instagram.com/rarecandy/
Written user reviews are not shown here. Check current App Store reviews >
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 advanced image recognition algorithms for better accuracy.
Assumption to check: Limited card scanning accuracy.
Validate with people who use this workflow before building.
Hypothesis 2
Adopt a minimalist design to improve usability.
Assumption to check: User interface can be cluttered.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize backend queries and caching for faster access.
Assumption to check: Slow loading times for card data.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate real-time market data for card valuations.
Assumption to check: Limited card valuation tools.
Validate with people who use this workflow before building.
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
Zustand
react-navigation
expo-camera
BUILD KIT DIFFICULTY
Advanced
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.
