Android Developers Develop Guides Stay organized with collections Save and categorize content based on your preferences. Wear OS 4 Prepare your apps for the latest version of Wear OS. Learn about behavior changes in Wear OS 4, and discover how you can further enhance your app's user experience. Prepare your app Explore features mobile_friendly Test your app 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 Check your emulator setup What's in Wear OS 4 power Power optimizations The latest version of Wear OS includes several updates and optimizations to help your app run as smoothly and efficiently as possible. watch Watch Face Format Bring your creative vision to life using either Watch Face Studio or the Watch Face Format. monitor_heart Health Services improvements Health Services offers improved permissions for background body sensors. On the emulator, test a wider variety of exercise types more seamlessly. code 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 movie Video: How to build high quality experiences on Wear OS Learn how to set your app apart by adding surfaces and features to drive engagement. Watch the video edit_note Blog: Wear OS 4 is now stable and available on Google Pixel Watch 2 Google Pixel Watch 2 is here and brings the capabilities of Wear OS 4 to users. Get your app ready for the latest software and devices! Read more