Both apps are available in the store, I have also installed them and they work well. However, for technical licensing reasons, at least with Amazon Prime in Switzerland you have a different offer than in Germany, for example. I'm not sure what's possible with Sky, but the app works great. In general, I can really recommend the Apple TV 4k. In my opinion, there is no better solution in terms of speed and ease of use. I hesitated for a long time because the first Apple TV disappointed me and I was never really happy with it. But the 4k is really great!