App Overview

OfferUp Buy & Sell Marketplace icon

OfferUp Buy & Sell Marketplace

OfferUp Inc. · Shopping

Buy, sell and shop with OfferUp

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.8
4,443,836 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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Combine features and design from your favorite apps.

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What's included18 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.

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.

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

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for OfferUp 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.
            

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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 a more intuitive search and filter experience.

Assumption to check: Users find it difficult to navigate through listings easily.

Validate with people who use this workflow before building.

Hypothesis 2

Add user verification and rating system for sellers.

Assumption to check: Inconsistent item listing quality and seller reliability.

Validate with people who use this workflow before building.

Hypothesis 3

Integrate secure payment methods like Apple Pay or PayPal.

Assumption to check: Limited support for payment processing and transaction security.

Validate with people who use this workflow before building.

Hypothesis 4

Customize notification settings for a personalized experience.

Assumption to check: Notifications can be overwhelming or irrelevant.

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

Buy, sell and shop with OfferUp. The largest mobile marketplace for local and nationwide buying and selling. OfferUp and Letgo have come together as one online marketplace to help you shop deals near you, discover new and secondhand finds, and make money from things you no longer need. Find great local deals on used furniture, couches, tables, cell phones, electronics, used cars, auto parts, clothes, shoes, vintage fashion, home goods, baby & kids items, sports equipment, and more. Whether you want to buy a secondhand phone, shop for a TV or computer, or sell old furniture, pre-owned clothes, or a used car, OfferUp helps you buy and sell locally with confidence. Find amazing furniture, vintage or secondhand clothes. Find auto parts, used car parts, everyday items, and household items nearby. Shop nearby for more great deals. Discover gently used clothes, quality furniture, and secondhand items on sale every day. Buy, sell, and trade everyday goods with people close by. Reselling has never been easier — list what you no longer use and resell it to neighbors nearby. Sell stuff fast, find great deals, and shop local in one place. OfferUp is a unique local marketplace built for your neighborhood, with easy pickup and finds waiting nearby. How to use OfferUp - Buy or sell almost anything in as little as 30 seconds - Find local items for sale nearby - Message buyers and sellers securely in the app - Build trust with ratings, profiles, and reputation features - Browse the marketplace by category, image, price, and location - Shop used, pre-owned, secondhand, and new items - Join millions using OfferUp across the U.S. - One of the easiest selling apps to list with — post an item in seconds - Sell stuff you no longer need and earn extra cash - Buy, sell, and trade items locally with people you can meet in person - Score free stuff and freebies posted by neighbors near you Buy, Sell Locally. You can finally skip classified ads, garage sale listings, yard sales, and the thrift store down the street. OfferUp is the simple way to buy and sell in your neighborhood. It's easy to buy and sell everyday goods from people nearby. From used couches and furniture to secondhand shoes, electronics, and used cars, our local marketplace makes it easy to find deals nearby or earn extra money from items you want to sell. Shop local favorites, shop home essentials, and shop nearby in a trusted marketplace built for convenient local shopping. Buy what you love, sell what you don't, and start buying or selling in seconds. Download OfferUp today to sell your used items and discover heaps of hidden treasures. If you subscribe to Promote Plus (1 month) via iTunes: Payment will be charged to iTunes Account at confirmation of purchase. Subscription automatically renews for $19.99 unless auto-renew is turned off 24 hours before the end of the current period. Account will be charged for renewal within 24 hours prior to the end of the current period at the rate of Promote Plus. Subscription and auto-renewal may be managed by going to Account Settings after purchase. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription, where applicable. Terms: https://offerup.com/terms/ Privacy Policy: https://offerup.com/privacy/

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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
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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.