Shopify provides many built-in features, but every business has different needs. Some stores may require customer reviews, while others may need advanced shipping, email marketing, loyalty programs, or inventory management.

This is where Shopify apps become useful.

A Shopify app adds new features and functionality to a store without requiring the merchant to build everything from scratch. Developers can install existing apps from the Shopify App Store or create custom apps for specific business needs.

In this lesson, you'll learn what Shopify apps are, the different types of apps, how they work, and how developers build and use them.

What is a Shopify App?

A Shopify app is software that extends the functionality of a Shopify store.

Apps help merchants perform tasks that are not available in the default Shopify features.

For example, an app can:

• Display product reviews
• Send marketing emails
• Create discount campaigns
• Manage inventory
• Connect shipping services
• Generate invoices
• Add live chat
• Create loyalty programs

Instead of building these features from scratch, merchants can install an app in just a few clicks.

Why Use Shopify Apps?

Every business is unique.

A clothing store may need a size guide, while a grocery store may require delivery scheduling.

Apps allow merchants to customize their stores based on their business requirements.

Benefits of using apps include:

• Saving development time
• Adding new features quickly
• Improving customer experience
• Automating repetitive tasks
• Connecting with third-party services

Apps make Shopify stores more powerful and flexible.

Shopify App Store

The Shopify App Store is an online marketplace where merchants can discover and install apps.

Apps are available in many categories, including:

• Marketing
• Sales
• Shipping
• Inventory
• Customer support
• Accounting
• SEO
• Product reviews
• Analytics
• Loyalty programs

Some apps are free, while others require a monthly subscription.

Types of Shopify Apps

Shopify supports different types of apps for different use cases.

Public Apps

Public apps are available to everyone through the Shopify App Store.

Any merchant can install them.

Examples include:

• Review apps
• Email marketing tools
• Shipping apps
• SEO tools

These apps are designed for general use.

Custom Apps

Custom apps are built specifically for one Shopify store.

They are not listed in the Shopify App Store.

Businesses use custom apps when they need unique functionality, such as:

• Internal inventory systems
• Company dashboards
• ERP integrations
• Custom reports

Only the intended store can use these apps.

Embedded Apps

Embedded apps run inside the Shopify Admin dashboard.

Instead of opening in a separate browser tab, they appear as part of the Shopify interface.

This provides a smoother experience for merchants.

How Apps Work

Apps communicate with Shopify using APIs.

A simple workflow looks like this:

Merchant Uses App
        |
        v
App Sends API Request
        |
        v
Shopify Processes Request
        |
        v
Store Data Returned
        |
        v
App Displays Result

This allows apps to securely access products, customers, orders, and other store information.

Installing an App

Installing a Shopify app is simple.

The general steps are:

• Open the Shopify App Store.
• Search for an app.
• Read its features and reviews.
• Click Install.
• Grant the required permissions.
• Configure the app settings.

After installation, the app becomes part of the Shopify store.

App Permissions

Apps need permission before accessing store information.

For example, an inventory management app may request access to:

• Products
• Inventory
• Orders

A marketing app may need access to:

• Customers
• Email addresses
• Discounts

Merchants should always review the requested permissions before installing an app.

How Developers Build Apps

Shopify developers build apps using web technologies such as:

• HTML
• CSS
• JavaScript
• React
• Node.js

Apps communicate with Shopify through APIs.

For example, a developer might request product data using JavaScript:

fetch("/products.json")
  .then(response => response.json())
  .then(products => {
    console.log(products);
  });

In a production app, developers typically use Shopify's official APIs and authentication methods to securely access store data.

Real-World Example

Imagine an online bookstore wants customers to leave reviews.

Without an app, the developer would need to build:

• Review forms
• Rating system
• Database
• Moderation tools
• Customer verification

Instead, the merchant installs a product review app.

Within minutes, customers can:

• Rate books
• Write reviews
• Upload photos
• Read other customers' feedback

The app saves time and adds valuable functionality to the store.

Best Practices for Using Apps

To keep your Shopify store secure and fast:

• Install only apps you actually need.
• Choose trusted and well-maintained apps.
• Review app permissions carefully.
• Remove unused apps.
• Keep apps updated.
• Test new apps before using them on a live store.
• Avoid installing multiple apps that provide the same feature.

These practices help maintain good store performance.

Why Apps Matter in Shopify Development

Apps are one of Shopify's greatest strengths. They allow developers and merchants to extend a store's functionality without modifying Shopify's core platform.

As a Shopify developer, you may build custom apps for clients, integrate third-party apps, or create public apps that thousands of merchants can use.

Learning Shopify app development opens the door to creating powerful business solutions and expanding the capabilities of any Shopify store.

Key Takeaways

• Shopify apps add new features and functionality to online stores.
• Merchants can install apps from the Shopify App Store or use custom apps built for specific businesses.
• Shopify supports Public Apps, Custom Apps, and Embedded Apps.
• Apps communicate with Shopify using secure APIs.
• Developers build apps using technologies such as HTML, CSS, JavaScript, React, and Node.js.
• Understanding Shopify apps is an important step toward becoming a professional Shopify developer because apps allow stores to grow beyond the platform's built-in features.