# Apps

### About ICR apps

Apps are tools that extend the Carbon registry's functionality. They can do things like request credit transfers and manage projects on behalf of organizations. They can also do things outside of the Carbon Registry platform based on events that happen on Carbon Registry. For example, an ICR App can notify potential buyers of carbon credits that credits have been minted and deposited into an "open" warehouse for sale.

For more information about using ICR Apps, see "[About using ICR Apps](/documentation/carbonregistry.com/api/apps/using-icr-apps.md)."

For more information about building ICR Apps, see "[About creating ICR Apps](/documentation/carbonregistry.com/api/apps/creating-icr-apps.md)."

For walkthrough examples, see "[Setting up an ICR app](/documentation/carbonregistry.com/api/apps/examples/setting-up-an-icr-app.md)"


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