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
WorldStock
“WorldStock” provides a summary of global markets performance.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 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'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 WorldStock: map the core Finance 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
Introduce customizable views and sorting/filtering options.
Assumption to check: Limited customization of watchlist and portfolio details.
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate tutorials and stock market guides.
Assumption to check: Lack of educational resources for beginners.
Validate with people who use this workflow before building.
Hypothesis 3
Provide news from various financial outlets for a comprehensive view.
Assumption to check: No news aggregation from multiple sources.
Validate with people who use this workflow before building.
Hypothesis 4
Offer a free tier with basic features to attract users.
Assumption to check: In-app purchases for advanced features may deter users.
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
“WorldStock” provides a summary of global markets performance. At a glance you can see what's happening in markets across the world. Supported iOS Features : • Home Screen Widget (iOS 14+) • Dark Mode (iOS 13+) Features : ---------------------------- Global Equity Performance Map ---------------------------- This map displays the performance of all the major global equity markets for today. The map interface helps you visualize the performance of global stock markets. ---------------------------- Performance Table ---------------------------- This table is useful to compare global markets performance easily. You can choose a period for which performance has been calculated. Available periods are : 15y, 10y, 5y, 3y, 1y, 6m, 3m, 1m, 1w, YTD ---------------------------- More than 100 markets data ---------------------------- More than 100 markets data are currently followed. Available markets: • Global Markets : Global, Developed, Emerging, Frontier, BRIC, Europe, Asia Pacific, Latin America, Africa, EAFE, Fear(VIX), European VIX • Developed Markets : US, Japan, UK, Germany, France, Canada, South Korea, Hong Kong, Singapore, Australia, New Zealand, Austria, Belgium, Ireland, Spain, Italy, Switzerland, Netherlands, Portugal, Denmark, Norway, Finland, Sweden, Israel • Emerging Markets : China, Brazil, India, Russia, UAE, Taiwan, Thailand, Philippines, Indonesia, Malaysia, Mexico, Chile, Argentina, Peru, Colombia, Greece, Czech Rep., Hungary, Turkey, Egypt, South Africa, Vietnam, Morocco, Pakistan, Poland, Qatar • Commodities / REIT : Commodity, Gold, Silver, Platinum, Oil, Brent Crude, Natural Gas, Wheat, Corn, Global REIT, US REIT, Japanese REIT, Australian REIT, European REIT, Asian REIT • Currencies : EUR/USD, USD/JPY, GBP/USD, USD/CHF, USD/CAD, EUR/JPY, AUD/USD, NZD/USD, EUR/GBP, EUR/CHF, AUD/JPY, GBP/JPY, CHF/JPY, EUR/CAD, AUD/CAD, CAD/JPY, NZD/JPY, AUD/NZD, GBP/AUD, EUR/AUD, GBP/CHF, EUR/NZD, AUD/CHF, GBP/NZD, USD/SGD, USD/HKD, USD/DKK, GBP/CAD, USD/CNY, USD/INR, USD/IDR, USD/MYR, USD/KRW, USD/TWD, USD/ARS, USD/BRL, USD/MXN, USD/CZK, USD/NOK, USD/PLN, USD/RUB, USD/SEK, USD/EGP, USD/ILS, USD/ZAR, NZD/CHF, CNY/USD, AUD/GBP, GBP/EUR, EUR/SEK, EUR/NOK, CAD/CHF, NZD/CAD, US Dollar Index • Cryptocurrencies : Bitcoin, Ethereum, XRP, Litecoin, Bitcoin Cash, BNB, Solana, TRON, Dogecoin, Cardano, Avalanche, Chainlink, Stellar Lumen • Bond Yields : 10-Year Government Bond Yields US, Japan, UK, Australia, Germany, France, Italy, Canada, Netherlands, Spain, Switzerland, Mexico, Portugal, Greece, Hong Kong, India, Brazil, Singapore, South Africa, New Zealand, Russia, South Korea • Stock Futures : E-mini S&P500, E-mini NASDAQ, E-mini Dow ---------------------------- Easy to Customize ---------------------------- You can customize the map interface and background color. Note : * The market data is not in real time. * You can not add your favorite stocks. ---------------- Report a Problem --------------- If you have any problems, please sent me an email. [[email protected]]
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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
@react-navigation/native
axios
zustand
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.
