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
Shpock: Buy & Sell Marketplace
Sell it
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.2
618 ratings · Top 30%
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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included14 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.
JavaScript is required to complete mailbox verification.
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 Shpock: Buy & Sell 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.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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 robust filtering and sorting system to enhance search capabilities.
Assumption to check: Users report difficulty in finding specific items due to lack of advanced filters.
Validate with people who use this workflow before building.
Hypothesis 2
Create a built-in chat feature to facilitate seamless communication.
Assumption to check: Inconsistent messaging experience with sellers.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance algorithms for item prioritization in listings based on user preferences and activity.
Assumption to check: Users encounter issues with item visibility in listings.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate multiple payment gateways including Apple Pay for better user retention.
Assumption to check: Limited payment options leading to user drop-off.
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
Sell it. Find it. Love it. Shpock is the joyful marketplace for second-hand. Give your unused items a new life and bag brilliant bargains from people nearby or nationwide. From vintage fashion to the latest tech, Shpock puts millions of buyers and sellers in your pocket, making sustainable shopping fast, safe and fun. If you no longer love it, someone else will! Trusted by millions • 80 million+ downloads worldwide • Apple “Best of 2017” – Sustainability • 400k+ 5-star ratings Why sell & shop with Shpock? • List an item in under 30 seconds – snap, price, post. • No buying fees, and unlimited listings from just 0.99 per month. • Secure in-app chat and user ratings for peace of mind. • Hassle-free local collection or self-organised shipping. • Instant offers and easy bargaining to seal the deal. All the categories you need Fashion & vintage • Electronics & tech • Home & garden • Kids & baby • Sports & hobby gear • Cars & motors • Property – and almost anything else you can think of. Whatever it is… Shpock it! Power-up your selling • Share your ad on social to reach more buyers. • Boost listings on the homepage and in search for extra visibility. • Open your own Shpock account and build a loyal following. Ready to join the circular economy? Download Shpock now, turn clutter into cash and discover your next favourite thing. Happy Shpocking! Need help? Drop us a line at [email protected]. Should you choose to subscribe for a membership, payment will be charged to your App Store account at confirmation of purchase. We offer two levels of monthly subscriptions (price may vary by location): Premium at £4.99 and Standard at £0.99. Accounts will be charged for renewal within 24-hours prior to the end of the current period, and the cost of renewal depends on the period of subscription chosen. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Auto-renewal may be turned off in your Account Settings in App Store after purchase. You can also manage your subscriptions in Account Settings after purchase. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Terms of service: https://www.shpock.com/en-gb/terms-conditions Privacy policy: https://www.shpock.com/en-gb/privacy-policy
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
React Navigation
Zustand
React Query
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.
