### [Wear OS 4](http://developer.android.com/training/wearables/versions/4/changes)

Learn about behavior changes in Wear OS 4, and discover how you can further enhance your app's user experience.  
[Prepare your app](http://developer.android.com/training/wearables/versions/4/changes) [Explore features](http://developer.android.com/training/wearables/versions/4/features) [![](http://developer.android.com/static/images/picto-icons/wearable-arrow.svg)](http://developer.android.com/training/wearables/get-started/debugging#update-wear-os)  

### [Test your app](http://developer.android.com/training/wearables/get-started/debugging#update-wear-os)

Explore how your app behaves on Wear OS 4. Install the latest stable system image of Wear OS 4 onto a physical device, or onto an emulated device in Android Studio.  
[Update your test device](http://developer.android.com/training/wearables/get-started/debugging#update-wear-os) [Check your emulator setup](http://developer.android.com/training/wearables/get-started/creating#configure-emulator)

## What's in Wear OS 4

![](http://developer.android.com/static/images/picto-icons/lightning.svg)  

### Power optimizations

Wear OS 4 introduces several updates and optimizations to help your app run as smoothly and efficiently as possible.  
![](http://developer.android.com/static/images/picto-icons/wear-os-development.svg)  

### Watch Face Format

Bring your creative vision to life using either Watch Face Studio or the Watch Face Format. ![](http://developer.android.com/static/images/picto-icons/health-services-logo.svg)  

### Health Services improvements

Health Services offers improved permissions for background body sensors. On the emulator, test a wider variety of exercise types more seamlessly.  
![](http://developer.android.com/static/images/picto-icons/code-2.svg)  

### 64-bit kernel and user space

Prepare your app for 64-bit only hardware and take advantage of the performance and security improvements introduced in Wear OS 4.

## Latest news

[![](http://developer.android.com/static/images/picto-icons/subscriptions.svg)](https://io.google/2023/program/ac09dc41-5d45-4ccd-ad87-2503e22c4e6c/)  

### [Video: How to build high quality experiences on Wear OS](https://io.google/2023/program/ac09dc41-5d45-4ccd-ad87-2503e22c4e6c/)

Learn how to set your app apart by adding surfaces and features to drive engagement.  
[Watch the video](https://io.google/2023/program/ac09dc41-5d45-4ccd-ad87-2503e22c4e6c/)  
[![](http://developer.android.com/static/images/picto-icons/learning-resources.svg)](https://android-developers.googleblog.com/2023/10/wear-os-4-is-now-stable-and-available-on-google-pixel-watch-2.html)  

### [Blog: Wear OS 4 is now stable and available on Google Pixel Watch 2](https://android-developers.googleblog.com/2023/10/wear-os-4-is-now-stable-and-available-on-google-pixel-watch-2.html)

Learn about the added capabilities that Google Pixel Watch 2 and Wear OS 4 bring to users.  
[Read more](https://android-developers.googleblog.com/2023/10/wear-os-4-is-now-stable-and-available-on-google-pixel-watch-2.html)