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
Shop: Track, Pay, Discover
Shop stores you love
Free · In-app purchases
OVERALL US RANK
#27
Free · all categories
REVENUE (Est)
$310K/mo
$181K - $439K
RATING
★ 4.8
7,233,876 ratings · Top 5%
Evidence scope: #27 is the current overall US Free chart position. 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 included19 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 Shop: Track, Pay, Discover: 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
Shop stores you love - Buy direct from millions of independent stores, from big brands to local faves. All built on Shopify, the world’s best commerce platform. - Follow stores to get notified about new products, restocks, and price drops. - Save items for later and organize things into collections (like “winter boots” or “gift ideas”). Get search results inspired by your style - The more you shop, the more Shop learns about your unique tastes. - Just describe what you’re looking for and get bespoke recommendations. - Follow up with more details until you find the perfect thing. Score deals designed just for you - Get special offers and deals only available on Shop. - Earn Shop Cash as you shop. Check out fast - Your payment info, shipping address, and shopping preferences all live in your secure wallet. - Check out instantly. No more getting up to go find your card. - All your shopping carts from every store are saved on Shop. Start shopping online, finish checking out on Shop. Track all your orders - Track every order from every store, all in one spot. - Map exactly where each package is now. - Shop can even scan your email for new order info and gather everything together for you in the app. No more searching your inbox for updates. - - - Have a question or want to say hello? Visit help.shop.app Good to know: Shop’s servers meet strict PCI compliance standards for vaulting credit card info.
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 real-time stock updates and alerts.
Assumption to check: Inconsistent product availability information
Validate with people who use this workflow before building.
Hypothesis 2
Offer multiple payment methods, including digital wallets.
Assumption to check: Limited payment options
Validate with people who use this workflow before building.
Hypothesis 3
Enhance onboarding tutorials and guided navigation.
Assumption to check: Difficult navigation for new users
Validate with people who use this workflow before building.
Hypothesis 4
Integrate live chat support for immediate assistance.
Assumption to check: Slow customer support response times
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
Zustand
Supabase
React Navigation
React Native Paper
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.
