You can also use FreeTube on desktop if you prefer a native client. If you want to use your browser, there are private frontends for YouTube that also block ads: Invidious and Piped. Both can be used with LibRedirect, which automatically redirects all YouTube links to your desired frontend. Other options for Android are LibreTube, NewPipe and Tubular. On iOS you can use Yattee with this guide, it's on the app store, so you don't even have to sideload it. It also works on iPadOS, macOS and tvOS. If you have an LG TV, you can use this app for webOS.