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
Double Holo: Card Scanner
Scan any Pokémon card and see its live market price in seconds
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
1,724 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.
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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 included17 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 Double Holo: Card Scanner: map the core Shopping 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 any Pokémon card and see its live market price in seconds. Then do what no other card scanner can: sell it, track it, and get alerts, all in one app, with a 4.9% seller fee. THE SCANNER • Point your camera at any raw card or graded slab and get an instant match • Live market price, sales history, and PSA 10 comps on every scan • Built for volume: scan binders, lots, and entire collections fast • The FASTEST Pokemon Card Scanner in the world. Raw cards have a 50ms average scan time. THE PRICE TRACKER • Prices from real sales, refreshed daily • Full price history charts for raw and graded copies • Watchlist any card and get alerts when its price moves THE MARKETPLACE • List a card for sale the moment you scan it • 4.9% seller fee (minimum $1), the lowest of any major card marketplace • Secure Stripe checkout with buyer and seller protection PREMIUM TOOLS • AI Picks: cards the data says to watch, with the reasoning shown • Sentiment: what collectors are saying across Reddit, tracked daily • Pack Value: expected value for every set before you rip • Grading ROI: what a card is worth graded vs raw, minus the fees • Market Research: deep charts, comps, and sales data for any card • Card Alerts: your targets, watched around the clock VENDOR HUB Built for card shops and show vendors: • Point-of-sale for card shows, with split payments • Inventory management with printable price labels • Deal tracking with profit built in • Shopify and eBay sync YOUR COLLECTION, FREE Track your collection with Shiny, included free: every card, graded or raw, with its live value. Join the collectors and vendors who buy, sell, and track on Double Holo every day. Download free and scan your first card in under a minute. Terms and conditions: https://doubleholo.com/terms
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 filtering and search features.
Assumption to check: Limited product discovery options
Validate with people who use this workflow before building.
Hypothesis 2
Add social features like following users and sharing products.
Assumption to check: Poor user engagement
Validate with people who use this workflow before building.
Hypothesis 3
Implement push notifications for messages and order updates.
Assumption to check: Weak notification system
Validate with people who use this workflow before building.
Hypothesis 4
Add product reviews and seller ratings to build trust.
Assumption to check: Lack of trust and reviews
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
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BUILD KIT DIFFICULTY
Expert
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.
