A custom app is built specifically for a single Shopify store rather than for public use.

These are official apps created and supported directly by Shopify.

Most Shopify apps are created by third-party developers, not Shopify itself.

Merchants can find apps in the Shopify App Store.

Shopify apps are tools that extend the functionality of a Shopify store by adding features such as marketing, shipping, reviews, SEO, automation, and analytics.

Never share collaborator access codes or login credentials.