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 - Sneakers and Apparel
Get your hands on exclusive drops, snag the latest releases, shop used & vintage items, and stay in the loop with the hottest trends from the world's top brands
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
1,293,974 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 - Sneakers and Apparel: 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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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.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Get your hands on exclusive drops, snag the latest releases, shop used & vintage items, and stay in the loop with the hottest trends from the world's top brands. 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 with ease: Explore an extensive selection of top-tier products and find the latest trends from the brands you love. Browse used and unique items in the Listings and Live Marketplace, available exclusively on the StockX iOS app for sellers in the United States. Buy and sell with confidence: Every item purchased from the StockX Verified Marketplace is either verified by StockX or shipped directly from a StockX Verified Seller. In the Listings Marketplace, buyers can shop used and unique items directly from sellers, with optional StockX verification available on select items. All purchases on the Verified, Listings, and Live Marketplace are backed by our Buyer Promise. Stay in the loop: Get notified instantly when new items drop and when promotions go live. Track the items you're following so you never miss a beat. Exclusive deals & promotions: Be the first to know about flash sales, limited-time offers, and special promotions, so you can shop smarter and score the best deals. Real-time updates: Receive instant updates on your orders, including shipping details and delivery notifications, so you're always in the know. Effortless selling: Selling has never been easier. Manage all your products, track your inventory, and stay updated on order statuses - all in one place. Select sellers can now list used and unique items directly through StockX Listings, all with no seller fees. "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 "2024 was a year of milestones for StockX, which eclipsed 60 million trades and 20 million buyers during the year." - Footwear News
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
TypeScript
React Navigation
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.
