> ## Documentation Index
> Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# App extensions

Prebuilt extensions to [customize Atoti UI](../guides/extending_the_app#ui-app-extension).

### atoti.app\_extension.ADVANCED\_APP\_EXTENSION *: [Mapping](https://docs.python.org/3/library/collections.abc.html#collections.abc.Mapping)\[[str](https://docs.python.org/3/library/stdtypes.html#str), [Path](https://docs.python.org/3/library/pathlib.html#pathlib.Path)]*

The `{name: path}` of an extension providing the following features:

* MDX editor
* Context values editor
* State editor
* Text editor widget