App Overview

Mercari: Buying & Selling App icon

Mercari: Buying & Selling App

Mercari, Inc. · Shopping

MEET MERCARI: a marketplace built for you

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.8
1,950,223 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.

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 Mercari: Buying & Selling App: 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 cleaner, more organized layout for browsing items.

Assumption to check: Difficulties in item discovery due to cluttered UI

Validate with people who use this workflow before building.

Hypothesis 2

Optimize image loading using caching strategies.

Assumption to check: Slow loading times for images

Validate with people who use this workflow before building.

Hypothesis 3

Integrate more payment methods including digital wallets.

Assumption to check: Limited payment options

Validate with people who use this workflow before building.

Hypothesis 4

Provide better tools and resources for sellers to manage listings.

Assumption to check: Inadequate support for sellers

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

MEET MERCARI: a marketplace built for you. Sell quick and save big all in one, top-rated marketplace. With 1000s of new and used items dropping daily, millions are shopping and selling on the Mercari marketplace. From clothing to collectibles, vintage Valentino to new Nintendo, find deals at up to 70% off retail. DESIGNED TO HELP SELLERS SUCCEED - Earn money decluttering unused items or start a side hustle - List in seconds – sell collectibles, once-loved clothing, toys, vintage, electronics, trading cards, makeup and antiques - Get your stuff seen and sold fast with millions of shoppers and tools like Promote and Offer to Likers - Get paid quickly with Instant Pay or direct deposit. You can also use your Mercari balance to fund your next find - Sell securely with ratings, reviews and Seller Protection DISCOVER DEALS FROM TRUSTED SELLERS - Thrift clothes, collectibles, antiques, unique handmade items, one-of-a-kind treasures, pre-loved pieces and more - Find what you’re looking for at a great price - Shop new, like-new, used and sale items - Discover hidden finds you can’t shop at retail – from limited edition to one-of-a-kind treasures - Get notified of price drops and exclusive offers from sellers - Pricing is flexible so you can shop within budget. Make offers to negotiate prices on your favorite finds - Bundle items to ship in one package and save on shipping MERCARI IS THE COMMUNITY MARKETPLACE THAT WORKS FOR YOU. SHOP MERCARI TO SAVE MONEY, GET AMAZING DEALS AND DISCOVER UNIQUE & VINTAGE ITEMS! MERCARI FEATURES: A HAUL OF GREAT BRANDS Shop clothing, shoes, and more from top brands including: - Lululemon, Athleta and Vuori athletic apparel - Nike, Adidas and Jordan sneakers - Apple, Sony and Microsoft devices FAVORITES FROM NICHE BRANDS - Tamashii Nations, Funko and Sonny Angel figurines - Loungefly backpacks and Hello Kitty toys - Calico critters and Sylvanian family COLLECTIBLES FOR EVERY FAN - Pokémon and Magic the Gathering trading card games - Topps and Upper Deck sports cards - BTS and ATEEZ photo cards - DC, Marvel, Dragon Ball Z and Star Wars action figures - Collectible pins and coins USED ELECTRONICS FOR LOW PRICES - Find vintage gaming consoles and used games - Shop computers, laptops, tablets and accessories - Buy used and vintage cameras, camera lenses, and camera bags - Browse guitars, keyboards, electric drums, amps, and other instruments KIDS TOYS & CLOTHES - Little Sleepies, Posh Peanut and Kate Quinn - Lovevery, Melissa & Doug and KiwiCo - Monster High, American Girl, JellyCat AUTHENTICATED LUXURY SHOPPING - Shopping for authenticated luxury goods? Buy designer handbags, shoes and jewelry from brands like Coach, Marc Jacobs and Dior - Shop the real deal. Items with a diamond badge are authenticated by independent experts, and every purchase is protected ONLINE SHOPPING TOOLS THAT WORK FOR YOU - Pay your way with Venmo, PayPal, credit card, split your payments or use your Mercari balance - Shop confidently with trusted transactions, seller communication via DM,ratings and reviews, and Buyer Protection - Get your item as described or your money back with free return shipping. NATIONWIDE SHIPPING & DELIVERY - Use Mercari Prepaid Labels to easily price and print either seller or buyer-paid shipping labels, track your shipments and get up to $200 Shipping Protection - Get standard and economy prepaid labels with UPS, FedEx and USPS including Media Mail and first class envelopes, or ship on your own - Sellers are asked to ship sold items within 3 business days DIRECT SHOPPING FROM JAPAN’S #1 MARKETPLACE - Easily shop millions of items direct from Mercari Japan - Find top Japanese brands including Evisu, Vizvim, Comme des Garçons, BAPE, and Beams and more - Save big on brands you know and love like Stüssy, Nintendo, Coach, Ascis, DOWNLOAD TODAY AND FIND OUT WHAT MAKES MERCARI THE EASY WAY TO THRIFT! Available in the US for anyone 18+

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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
React Native
Expo
Axios
React Navigation
Zustand
Firebase Auth
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.