How To Build A Marketplace App Like OLX & OfferUp in 2021?

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Online marketplaces tend to be the most viral thing in the arena of e-commerce. The credit of their popularity goes to multi vendor marketplace giants such as OlxOfferUpeBay and Letgo. The change these online marketplaces have brought is beyond belief. 

Online marketplaces are opening opportunity doors, both for buyers and sellers. Buyers can get the products delivered at their doorsteps from the comfort of their couches. On the other side of the coin are sellers, acquiring customers from any corner of the world. Sellers are saying goodbye to dilemmas (Short term, long term. Head up, head down) and sealing sales deals within seconds. Isn’t it incredible how easy it is for sellers to do the virtual handshake with buyers?

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

The boom in the mobile market has bent entrepreneurs’ interest towards baking new online marketplace ideas. How to build a marketplace app like OfferUp, Letgo, or Olx  is one of the most asked questions in recent days. 

Local marketplace apps like MercariCarousell, and OfferUp has become the primary place for people to purchase products. With the target audience already sitting on the online marketplaces, who would want to create a product website only to invest in Search Engine Optimization (SEO) and App Store Optimization (ASO)

Read Also: Online Marketplace And Its Mighty Future: Goodbye To Godowns 

If you are among the inspiring brains that aspire to make marketplaces (& money) by launching a buy and sell app like OLX and OfferUp, this pile of words will put an end to your wonder. 

How To Build A Marketplace App

Here are 10 steps that best encapsulate a way to build a marketplace app. 

  • Step 1: Conduct in-depth market research and analysis of marketplace app giants
  • Step 2: Decide on the marketplace type. 
  • Step 3: Choose a monetization model
  • Step 4: Pick a tech stack
  • Step 5: Basic and advanced features should be added
  • Step 6: Come up with a unique name
  • Step 7: Build an attractive UI and UX of your marketplace app
  • Step 8: Scrutinize the financial model of your app (integrate payment methods)
  • Step 9: Promote, grow, and scale your product
  • Step 10: Consider fraud protection

Major E-Commerce App Development Stages In Depth

The process of building a buy and sell marketplace app goes through the following stages: 

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

  • Determine The Type Of Marketplace You Want

Decide who is your target audience. Decide upon your niche. Decide which market you want to focus on. Do you want to build a marketplace app for clothing only or do you want to build an app to sell everything? Do you want to narrow your focus or broaden your spectrum? Here are the classifications of online marketplaces to simplify your decision-making process. 

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

  • Choose A Monetization Model

There are five main monetization models: commission model, subscription model, listing fee model, featured listing model, and ads. You can also go with the hybrid model (a mix of two models). 

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

  • Prototyping And Project Documentation

Prototyping makes it easy to understand the way the user is going to utilize the marketplace app. The creation of a marketplace prototype demands a detailed description of your product’s purpose

A technical specification includes stating the app’s purpose, feedback from the end-users, and checking the business potential of your marketplace app idea

  • User Experience

Several factors including defined targeted audience and stated goals are taken into consideration during the process of design outlining. Finally, the screens are designed to comply with the concept. 

The first design is introduced with a Minimum Viable Product (MVP). At this stage, the marketplace app goes through the testing and feedback loop to improve the overall design and functionality of the product. 

How To Build A Buy And Sell App Like OLX & OfferUp in 2021? How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

It goes without saying that buy and sell marketplace apps should be performance-driven, must have a simple and intuitive UI and UX, and must carry an advanced set of features

  • Tech Stack To Build A Marketplace App

The Tech stack acts as a backbone that influences the functioning of a marketplace app. So, let’s define what tools and third-party services an on-demand app development company may use to build a marketplace app

  • Platforms: Android or iOS
  • Push notifications: Twilio,
  • Frameworks: Angular.js, Backbone.js, React.js
  • Languages: Swift/Objective-C (iOS apps), Kotlin/Java (Android apps), React Native (Cross-platform)
  • Server-side development: Node.js, Express.js.
  • Client-side development: JavaScript, HTML, CSS, Bootstrap
  • Database: MongoDB, MySQL
  • Cloud architecture: AWS, Azure, Google
  • Third-party integration: PayPal, Braintree, Stripe, e-Wallet
  • Web server: Nginx
  • Recommendations: Machine learning algorithms
  • Analytics: Google analytics
  • Other monitoring and hosting tools: AWS S3, Confluence, Swagger, MailChimp, PostgreSQL.
  • Fraud Protection

Fraud protection is the key to gain customers’ loyalty and trust. Simply put, it’s the key to steady market growth.

Even seemingly innocuous user behavior can lead to the exploitation of a newly discovered software bug. Rules-based fraud detection algorithms, backed by AI and machine learning technology, can be the answer to stopping fraud methods. 

Both buyers and sellers must go through the verification process before they can register with the app. Advanced fraud detection tools that can identify patterns consistent with frauds and unusual user behavior come in handy to detect fraudsters in real-time. 

  • Scaling And Expansion

Once you have garnered enough attention in the market with your buy and sell marketplace app, start moving towards scaling and expanding. The best you can do is target the most accessible platforms for users to access your app easily. 

Innovative features translate to an engaging user experience.

So, don’t hesitate to revamp the functionality of your app from time to time. Draw a portrait of your potential suppliers and buyers on the platform. You can turn to market professionals to get in-depth insights into your audience. 

Use creativity to clutch the curiosity of your community.

You can put the power of blogging and storytelling to your own use. Users’ curiosity to share ideas and opinions can invite more customers to your platform. 

Le.Offer: Readymade Solution To Build A Marketplace App 

Going for a pre-built marketplace app script reduces your development efforts and eventually, the overall cost. Embedded with all the essential features and topped off with extra zing (social element, product exchange features, etc), Le.offer is the best used-goods multivendor marketplace script out there. 

Key Features Of A Buy And Sell Marketplace App

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

  • Onboarding 

Build a marketplace app where onboarding is easier. You can either make two separate applications for buyers and sellers or infuse both the roles into one application. The onboarding process is easier even if you decide to go with the latter option. The first option is, however, uncommon for online marketplace apps.  

Just after the onboarding stage, our pre-built script allows the users to create their profiles. You can also embed a tutorial for users (a step-by-step process on how to use the app) to give them a tour of your online marketplace app

  • Login/ Social Network Integration

This functionality of logging into the app via social media increases users’ reliance on your app. Not only you’ll witness an exponential increase in the number of users but also this feature acts as an identity proof.

Besides, users don’t need to fill essential fields such as name, contact info, e-mail, etc. This feature will pull out users’ entire information from a social network. OfferUp, Carousell, and Olx all buy and sell marketplaces have this in-built feature. 

  • Listing Items And Recommendations

The listing feature is at the core of a multivendor marketplace app. Listings display the product pictures, a brief description of the product, ratings, and reviews. Don’t skip the process of pagination when you decide to build a marketplace app. 

Pagination is the process of separating piles of data into small chunks. Paging works magic for online marketplaces, loading more information in lesser time. 

Artificial Intelligence (AI) can arm your marketplaces with the power to predict and sense users’ behavior.

Our pre-built OfferUp clone script not only showcases the searched products but also makes suggestions based on users’ previous searches and the items added to favorites

  • Personal Profile 

Highly intuitive and UX-focused personal profile pages contain users’ information and all the items for sale. With OfferUp clone, you can build a marketplace app where buyers can update their profiles, add/delete cards, and change settings. They can also follow sellers on the app. 

Followers get a notification every time the buyer lists a new product. The follower and following count is also visible on the profiles.

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

Sellers can see the number of views the products get and the number of users who have added their items to the favorites list. They can edit the business name, contact information, and addresses. They can also view the detailed insight of their ads: click count, comment count, chat count, saved count, and shared count. 

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

Besides, a short list of settings is also embedded into the profiles for users to customize notifications.

  • Submit Offers & Negotiate Or Buy Direct 

The submit offer feature allows buyers to negotiate for products they would want to purchase. The buy direct feature allows sellers to post an ad with no option to negotiate or exchange

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

  • Exchange Products 

Conflicts and compromises? Nah, comfort and convenience! Build a marketplace app? Why not build a buy and sell (+ exchange) marketplace app? Introducing you to the “Exchange Products” feature of our pre-built marketplace script, Le.Offer! The feature allows users to exchange products without exchanging money. ⠀

Besides, other users can also make a counter-offer with one of their products. 

How To Build A Buy And Sell Marketplace App


  • View Ads

A grid view above the category field shows the promoted products. Users can request access to geolocation to view relevant ads. 

  • Highlight Ads

Highlighted posts show up in the social feed. Sellers have to subscribe to a paid subscription plan to promote their products. The multi-step process to upload ads on the marketplace script is similar to OLX. Different ad fields show upon selecting product category.   

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

  • Categories

User convenience comes attached with categories.

This feature motivates sellers to play fair and improve the ratings of their products. On the other end, it helps sellers skip the hassle and save time. 

  • Favorites

Le.Offer offers users an option to add favorites so that users don’t lose insight into the products they are considering purchasing later.

  • Search and filters 

The search has to be conducted based on users’ location. Le.offer, our pre-built marketplace app script, comes with an option to constrict or extend the search band. You can make the search predictive by showing users the no. of results for a certain query. 

The filter feature actually filters out a marketplace app’s chances of failure.

With Le.Offer, users can apply filters by price, ratings, delivery types, products, size, location, etc. 

  • QR Code

A unique QR code is generated for each order. Buyers can scan the QR code to confirm the shipment of an item. 

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

  • Ratings And Reviews

Consider ratings and reviews feature when you decide to build a marketplace app. Zero or no reviews can make users neglect sellers’ products. A five-star rating system is the most popular one, but you can also come up with something more original. Ratings do have different forms.

The rating and review system isn’t only reserved for the buyers. Bother buyers and sellers that rate and review each other’s service after the completion of a transaction. 

  • Payment Gateway/ In-App Payment

The next step is checking out. Our buy and sell marketplace script makes it fast and easy for users to pay while offering users multiple payment options. Our pre-built buy and sell marketplace app doesn’t sacrifice security in an attempt to avoid cart abandonment. Every time our app asks for an email or mobile number, a unique verification code is sent to the users to confirm all their data. 

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

Besides, users can withdraw money from their wallets directly to their bank accounts by requesting the administrator. The payment is processed after the admin approves the request.

  • Payment Escrowed

For those who want to build a marketplace app to stand should to shoulder with the competitors, don’t miss including the Payment Escrowed feature. During the transaction where the buyer pays the seller, the payment is escrowed and reflected in the pending balance. The buyer has to scan the seller’s QR code to release the payment.

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

  • Shopping Cart

A shopping cart allows users to add products from different sellers. The feature showcases the price of all the products combined and allows users to apply coupons, offers, and other loyalty program attributes

  • Delivery Tracking 

Delivery is, of course, the responsibility of sellers. However, you can always go with the option of embedding a delivery tracking system within your app. Why not build a marketplace app that can vanish half of the worries of buyers and sellers into thin air?

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

  • Push Notifications

Rich push notifications allow you to inform your users of recent updates by attaching media to notifications. This feature taps into the curiosity of the users and makes notifications more enticing to click on.

  • Built-In Chat And Call

Communication is the key to closing deals.

Le.Offer’s support chat and call feature allow sellers to communicate with users regarding products, services, and deals. To avoid security and privacy breaching of users, you can go with the phone number masking feature. This feature allows buyers to connect with delivery boys without exposing the mobile number. 

  • Built-In Camera

Built-in camera feature allows sellers to click a picture, edit it, cut it down, adjust its brightness, and upload it without exiting the app.

  • Product And Price Comparison

Did you know that nearly 70% of online shoppers visit Amazon to do product and price comparisons? While this advanced feature offers you an advantage over competitors, it also offers users an opportunity to choose the best items – easier and quicker. 

  • Multi-Currency And Language Support

For those who aspire to go global with the product, the buy and sell marketplace script offers multi-currency and multi-language support

  • Auto-Tax Calculation

This feature makes tax management easier for sellers. Build a marketplace app that helps businesses run their operations smoothly and plummet the probability of misshapen tax policies down to zero.  

  • Dashboards

This feature helps sellers zoom into areas such as accounting, operations, and sales without jumping to another page. Dashboards carry good potential for businesses. 

Also Read: Top 10 Online Marketplaces: Sites To Buy And Sell Stuff

  • Marketing Tools

 An in-built marketing toolkit helps businesses to tap into consumers’ interest and motivate their buying action. 

  • Inventory Management

This feature is a big must-have. It helps sellers avoid stockouts, manage multiple locations, and ensure recordkeeping.

An inventory system acts as a grease that sellers need to run their business smoothly.

Admin Panel

Irrespective of the marketplace type and the monetization model, the buy and sell marketplace app requires the development of three panels: admin panel, buyer panel, and seller panel

Visible only on the backend side, the admin panel allows the admin to manage stock, tax, users, and customers. This panel enables the admin’s control over approving a new list of products, managing reviews, setting up commissions for sellers, etc.

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

  • Real-Time Analytics

Is your marketplace business healthy? Is your strategy working? What isn’t going the way you expected? The answer to these questions is embedded into the integrated analytics system. The analytics system acts on data as soon as it enters the system. 

  • Customer Relationship Management (CRM) Integration

Integrated CRM tool helps you build better customer relationships and develop better services and products. CRM tool carries the ability to provide your customers the service they are looking for. 

  • Cloud Environment

Change is the only constant, no matter the market.

Cloud environment helps your marketplace cater to this change. Cloud provides a scalable architecture which means you can upscale or downscale your services as per the changing demand and scenarios of the market. 

The Bottom Line

Avoid recreating your website on mobile. Find ways to bring value to your mobile users. Decide on the details. Decide on the methods to monetize your mobile app. Decide on the products you want your app to feature. Define distinctive features. Correctly design the Minimum Viable Product (MVP) model. 

Creating a buy-and-sell marketplace app is no doubt a good idea. But, before your start translating your marketplace idea into a technical specification, turn to an experienced app development team. Why? Because the devil is in the details. With an experienced app development team’s support, you can build a marketplace app and arm it with Augmented Reality and gamification to get ahead of your competitors. 

How To Build A Buy And Sell App Like OLX & OfferUp in 2021?

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Disclaimer: The Blog has been created with consideration and care. We strive to ensure that all information is as complete, correct, comprehensible, accurate and up-to-date as possible. Despite our continuing efforts, we cannot guarantee that the information made available is complete, correct, accurate or up-to-date.

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