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
StockX: Live Marketplace
Access the latest styles and take your wardrobe or collection to the next level
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
1,313,858 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 StockX: Live Marketplace: 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
Access the latest styles and take your wardrobe or collection to the next level. Stay in the know with alerts for new arrivals, exclusive deals, and everything you need to make your shopping experience simple. • 60M+ Lifetime Trades • 20M+ Lifetime Buyers • 2M+ Lifetime Sellers • 30M+ Visitors Per Month "Award-Winning Marketplace since 2016" Shop New and Used: Explore new releases from the brands you love, or discover used and unique items sold directly by other sellers. Buy now, place a bid, follow market prices, and find the right item for your collection. Plus all purchases are backed by the StockX Buyer Promise. Shop Live: Join hosts and collectors for real-time shopping, live drops, and community moments. Discover sneakers, apparel, vintage, trading cards, collectibles, and more. Discover Mystery Boxes: The thrill of the reveal, backed by real market data, transparent odds, and StockX verification. Items revealed will always be worth at least the price of the box, before processing fees. And you can sell back for up to 90% in StockX Credit, valid on any purchase across the marketplace. Sell Simply: Turn what you own into your next sale. Add new or used items, manage everything you’re selling, track inventory, follow orders, and view your selling activity in one place. Confidence Built In: Purchases of new, used, and Live items are backed by our Buyer Promise, which protects you if your order arrives materially different from what was described. Never Miss What’s Next: On the StockX app, you can follow the products you want, get alerts for new drops and Live events, discover limited-time promotions, and receive real-time order and delivery updates. "I really like the fact that sneakers are a big part of what StockX is doing. When I found out that they happen to be doing it from downtown Detroit, it made even more sense to get involved." - Eminem
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 by size, brand, and price range.
Assumption to check: Limited product filtering options
Validate with people who use this workflow before building.
Hypothesis 2
Optimize image loading and caching for faster performance.
Assumption to check: Inconsistent loading times
Validate with people who use this workflow before building.
Hypothesis 3
Include more detailed descriptions and user reviews on product pages.
Assumption to check: Lack of detailed product information
Validate with people who use this workflow before building.
Hypothesis 4
Streamline the return process with clear instructions and quick access.
Assumption to check: Difficult return process
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
Supabase
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Zustand
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.
