What are Brevo app extensions?

App extensions are how you customize your experience in Brevo, letting you bring your own functionality into both the backend and the Brevo frontend. A single app can be purely backend logic, purely custom UI components, or both. A Brevo App is the container for these extensions, managed with the Brevo CLI .

Extension types

OAuth apps

Authenticate with OAuth and call the Brevo API on behalf of a user from your own system.

Action links

Create a custom UI component on a Brevo record that opens your website, passing its details as URL parameters.

Brevo Functions

Select from a template or generate it with AI to calculate contact attributes.

Iframe modals

Embed your website in a modal that opens on top of a Brevo record. Coming soon.

Looking for a pre-built plugin or data connector instead? That’s a different type of app. Check the Brevo App Store.

Get started

New to Brevo Apps? Start here: it walks through installing the CLI and creating your first app.

Guides

• Authenticating a backend app with OAuth
• Passing context through an action link
• Manage your OAuth app scopes
• Managing apps from the CLI

Further reading

• OAuth 2.0: how token-based authorization works for backend apps
• CLI reference: every brevo command for managing apps