# On-Device Mode
The common way of Oz Mobile SDK to work is the server-based mode, when the Liveness and Biometry analyses are performed on a server as shown in the scheme below:
But there's also an option to perform checks without server calls or even Internet connection. This option stands for on-device analyses.
The on-device analyses are being performed faster and more secure as all data is processed directly on device, nothing is being sent anywhere. In this case, you don’t need a server at all, neither need you the API connection.
{% hint style="info" %}
However, the API connection might be needed for some additional functions like telemetry or server-side SDK configuration.
{% endhint %}
The on-device analysis mode is useful when:
* you do not collect, store or process personal data;
* you need to identify a person quickly regardless of network conditions such as a distant region, inside a building, underground, etc.;
* you’re on a tight budget as you can save money on the hardware part.
### Launching the On-Device Analysis
To launch the on-device check, set the appropriate `mode` for Android or iOS SDK.
Android:
{% tabs %}
{% tab title="Kotlin" %}
```kotlin
analysisCancelable = AnalysisRequest.Builder()
.addAnalysis(Analysis(Analysis.Type.QUALITY, Analysis.Mode.ON_DEVICE, mediaToAnalyze))
```
{% endtab %}
{% tab title="Java" %}
```java
analysisCancelable = new AnalysisRequest.Builder()
.addAnalysis(new Analysis(Analysis.Type.QUALITY, Analysis.Mode.ON_DEVICE, mediaList))
```
{% endtab %}
{% endtabs %}
iOS:
```swift
let analysis = Analysis.init(media: mediaToAnalyze, type: .quality, mode: .onDevice)
```
For details, please refer to the Checking Liveness and Face Biometry sections for [iOS](/oz-knowledge/guides/developer-guide/sdk/oz-mobile-sdk/ios/checking-liveness-and-face-biometry.md) and [Android](/oz-knowledge/guides/developer-guide/sdk/oz-mobile-sdk/android/checking-liveness-and-face-biometry.md).
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