Shopify App

A Shopify app is a web service that integrates with a Shopify store through OAuth, the GraphQL Admin API, the Storefront API, and webhooks. After a merchant installs the app, Shopify redirects to the app's OAuth flow, where the merchant grants specific scopes such as read_products or write_orders. The app stores an access token and uses it to read or write data on the store's behalf.

Apps fall into a few flavours. Public apps live in the App Store and follow Shopify's review guidelines. Custom apps are built for a single store and avoid the review queue but cannot be distributed. Theme apps embed UI into Online Store 2.0 themes via app blocks, while admin apps embed into the Shopify admin via App Bridge. Most modern Shopify apps mix at least two of these surfaces.

For example, a reviews app reads orders via webhook, sends a request-a-review email after fulfilment, and embeds the captured reviews into the product page through a theme app block. A second example: an AI shopping assistant like Shop Me installs as an app, reads the catalog via the Admin API, embeds a chat widget on the storefront, and surfaces analytics in an admin section the merchant opens from the Shopify sidebar.

For most Shopify merchants, the app ecosystem is what makes the platform usable. Out of the box, Shopify provides a strong foundation but does not solve every workflow. Apps fill those gaps without forcing the merchant to write code or move off the platform.

The trade-off is performance and predictability. Each app adds scripts, latency, and a dependency. Good app hygiene means installing only the apps that drive measurable revenue or save measurable time, removing trial apps promptly, and watching theme weight on mobile. A merchant running 30 active apps will almost always have slower load times than one running ten well-chosen ones, which directly affects conversion.