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
Fanatics Collect
Fanatics Collect is the most trusted and dynamic marketplace for buying and selling sports cards, TCG, and sports memorabilia.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
7,951 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 included18 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 Fanatics Collect: 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
Integrate more payment gateways like PayPal, Venmo, etc.
Assumption to check: Limited payment options for transactions
Validate with people who use this workflow before building.
Hypothesis 2
Implement better filtering and sorting options for collectibles.
Assumption to check: Difficult navigation in large collections
Validate with people who use this workflow before building.
Hypothesis 3
Optimize image loading and caching strategies.
Assumption to check: Occasional app crashes during image loading
Validate with people who use this workflow before building.
Hypothesis 4
Add forums or chat features for users to discuss collectibles.
Assumption to check: Lack of community features
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
Fanatics Collect is the most trusted and dynamic marketplace for buying and selling sports cards, TCG, and sports memorabilia. EXPLORE Browse hundreds of thousands of sports cards, TCG, and memorabilia listings in our Buy Now marketplace or Weekly and Premier auctions. BUY Buy with confidence. Every card for sale on Fanatics Collect has been shipped to us, authenticated and verified before listing. SELL List your cards for sale and find a buyer quickly and easily, with the most competitive seller rates in the industry. VAULT Store and secure your collectibles in our industry-leading Vault facility. App Features More Ways to Sell Users can easily sell their cards through our curated Weekly Auctions, our high-end Premier Auctions, or as a fixed price with the ability to accept offers on our Fixed Price Marketplace. Your Vault Portfolio View your entire portfolio on your phone. All cards are listed in a fun and straightforward interface, including insured values for each card and a stated value of your entire vault portfolio. Ship to the Vault Not a Fanatics Collect Vault member yet? The app provides users with a unique vault address with instructions on how to send in your first shipment of cards.
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
Zustand
Supabase
react-native-gesture-handler
@supabase/supabase-js
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.
