In terms of content, you have access to apps such as Prime Video, Netflix, Crave and more. And you can watch 4K Ultra HD video from Netflix and Prime Video on the Fire TV Stick 4K. One thing to note is that because of ongoing tensions between Google and Amazon, there is no official YouTube app for the Fire TV Stick 4K, there are third-party ones available for the device. Since the Fire TV Stick 4K has Alexa, you can control your smart home devices such as Philips Hue, Ring, SmartThings and more. You can also ask Alexa questions and to search for content to watch. Essentially, you can use the Fire TV Stick 4K as an Echo Show.