Which platforms are commonly used for developing wearable device applications?
The commonly used platforms for developing wearable device applications include **Android Wear** for Android-based wearables, **watchOS** for Apple Watch, and **Tizen** for Samsung wearables. These platforms provide developers with the necessary software development kits (SDKs) and tools to create applications specifically designed for wearable devices. Each platform has its advantages and considerations, such as user base, app distribution, and hardware compatibility.