# Pre-install Applications

## Disclaimer

{% hint style="warning" %}
Custom applications have the capability to interact with the flight controller and therefore can have severe impact on the vehicle's safety and performance.
{% endhint %}

## Include apps in AuterionOS

In case you have your own applications for AuterionOS, you can add your built app artifact (eg: `myapp.auterionos`) to the directory `auterion-developer-tools/apps`. All applications in this directory will be automatically injected into your AuterionOS image when using the basic `make package-update` command. Once the modified AuterionOS is installed onto your deice, the apps will be automatically installed as well.

The following make-command for the auterion developer tools builds AuterionOS and includes custom apps:

```bash
make package-update version=my-version artifactPath=<AEPX4 Release>.auterionos
```

## Exclude apps from AuterionOS

If there are applications stored in `auterion-developer-tools/apps` and **that should not be included** in the custom AuterionOS image, the injection can disabled with the argument `skipApps=1` when running the command packaging command. For example:

```bash
make package-update skipApps=1 version=my-version artifactPath=<AEPX4 Release>.auterionos
```

You can learn more about developing applications in the Developer Documentation.