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
My Card Post
Welcome to My Card Post — the next-generation sports card marketplace for collectors, by collectors
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 5.0
67 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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 My Card Post: map the core Shopping workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
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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 multiple payment gateways for better flexibility.
Assumption to check: Limited payment options can frustrate users.
Validate with people who use this workflow before building.
Hypothesis 2
Implement advanced search features with filters and categories.
Assumption to check: Product discovery can be hard due to poor search functionality.
Validate with people who use this workflow before building.
Hypothesis 3
Add in-app chat for faster support.
Assumption to check: Slow customer support response times.
Validate with people who use this workflow before building.
Hypothesis 4
Use machine learning to suggest products based on user behavior.
Assumption to check: Lack of personalized recommendations.
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
Welcome to My Card Post — the next-generation sports card marketplace for collectors, by collectors. Why My Card Post? Tired of high fees and impersonal transactions? My Card Post lets you buy, sell, and trade cards without the hassle of seller fees, giving you more value in every deal. Our platform goes beyond just transactions, offering a space to build real connections with fellow collectors. Key Features: • No Seller Fees: Maximize your profits by selling or trading your cards individually or in bulk without worrying about seller fees. • Seamless Card Syncing: Our PSA and TAG auto-sync feature allows you to list your graded cards in seconds—just a few taps and your listing is ready to go. • Real-Time Notifications: Get instant updates on offers, trades, and messages. Never miss a deal again with our real-time alerts. • Flexible Buying, Selling, and Trading: Whether you want to buy a card outright, trade with other users, or mix both, My Card Post gives you the flexibility to deal on your terms. • 24/7 Card Show Experience: Enjoy a live card show experience at any time—browse, make deals, and connect with fellow collectors from the comfort of your home. • Safe and Secure: All transactions are handled securely, and our platform promotes a trusted community environment for every collector. Who is My Card Post for? • Card Collectors: Whether you’re into sports cards or trading cards, you’ll find a community of like-minded collectors and a wide variety of cards to buy, sell, or trade. • Hobby Shops: Perfect for local card shops looking to expand their reach, My Card Post provides a fee-free platform to list inventory, connect with buyers, and make bulk deals to support in-store and online inventory needs and sales. • Hobby Enthusiasts: My Card Post is a space for the passionate hobbyist who loves to stay on top of market trends and build their collection. • Deal Hunters: With no seller fees, My Card Post is where the best deals happen, allowing you to maximize value on every transaction. Join the Movement Sign up today and become part of a growing community of card collectors who are changing how the hobby is experienced! Let’s keep the deals flowing, cards moving, and the fun alive. Whether you’re looking for your PC card or ready to offload a few, My Card Post is your go-to destination. Privacy Policy : https://mycardpost.com/privacy-policy Terms & Conditions : https://mycardpost.com/terms-condition
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
@react-navigation/native
axios
react-native-gesture-handler
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.
