I use an iPhone 6 and have refused to upgrade iOS to the latest version, so there are quite a few apps that don't work on my phone anymore (when launched, they show a message saying I need to get the latest version of the app, but then I can't get it because it's not available for my version of iOS), one of those apps is YouTube, so I'm limited to accessing it through the browser. It would be great to have a good alternative.