> For the complete documentation index, see [llms.txt](https://docs.luciq.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.luciq.ai/react-native/setup-luciq-for-react-native/setup-application-performance-monitoring/app-launch.md).

# App Launch

Luciq automatically measures your **cold app launch** latency, which is the time between when your user launches the app from scratch and when it is responsive and accepting touch events.

### End App Launch

In the event that you'd like to define a specific point in time where the app launch can be considered complete, such as when the app is actually interactable, you can use the end app launch API to set that point. You'll then be able to see this data alongside the automatic cold and hot app launches that were captured.

To use the End App Launch API, you'll just need to call the following method:

{% code title="JavaScript" %}

```javascript
APM.endAppLaunch()
```

{% endcode %}

### Disabling/Enabling App Launch Tracking

If APM is enabled, our SDK starts collecting data about your app launch time by default. If needed, you can always toggle this on and off by updating the relevant flag after the SDK is initialized:

{% code title="JavaScript (Enable)" %}

```javascript
// Enable
APM.setAppLaunchEnabled(true);
```

{% endcode %}

{% code title="JavaScript (Disable)" %}

```javascript
// Disable
APM.setAppLaunchEnabled(false);
```

{% endcode %}


---

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