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
Card Ladder
The Most Accurate Sports and Pokemon Card Price Guide and Collection Tracker on the Market
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
11,750 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/
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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 Card Ladder: 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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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
The Most Accurate Sports and Pokemon Card Price Guide and Collection Tracker on the Market Track and grow your collection with comprehensive analytics and value estimations for millions of cards, including sales data from all the top platforms. Browse for free, or take your game to the next level with Card Ladder Pro. Free Features • Search card values and statistics of our verified cards • Read daily hobby news, content, and headlines • Browse daily sales recaps • Follow the Card Ladder Index daily • Buy cards from several marketplaces Card Ladder Pro Features • All the FREE Features • View all-time sales history from every marketplace • Advanced value estimation for millions of cards backed by our industry leading indexes • Add any card to your collection with accurate value estimates • Track the value of your whole collection • Track player market performances • Configure price alerts • Customize your own dashboard • Advanced searching, filtering and sorting • In-depth comparisons of multiple cards • View collection showcases of other members ...and so much more! Love Card Ladder? Follow us on Instagram: https://www.instagram.com/cardladder/ Follow us on Twitter: https://twitter.com/CardLadder Terms of Use: https://www.cardladder.com/terms Privacy Policy: https://www.cardladder.com/privacy
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 a more robust valuation algorithm or integrate with real-time market data.
Assumption to check: Users find it hard to accurately value their collections.
Validate with people who use this workflow before building.
Hypothesis 2
Add features for users to connect, share collections, and trade cards.
Assumption to check: Limited social features to connect with other collectors.
Validate with people who use this workflow before building.
Hypothesis 3
Create a clearer paywall and feature explanation for premium subscriptions.
Assumption to check: In-app purchases can be confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify navigation and reduce screen clutter for better usability.
Assumption to check: Navigation can feel cluttered with many options.
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
Axios
Zustand
@react-navigation/native
Supabase
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.
