uYouPlus (iOS), a modded version of the official iOS app (arguably the most feature-complete alternative to Vanced).YouTube++ (iOS) (I have no legit link yet).YouTube Pink (I have no legit link yet).Alternatively, the Brave browser supports background playback OOTB (needs to be enabled see coment by and a build in ad-blocker, but no extension / add-on support. Depending on the browser, you'll additionally need to install a user script for background playber. These all work on both desktop Firefox and Chrome, but on mobile, you'll need to install an add-on compatible fork (source code alteration) of them, like IceRaven for Firefox or KiwiBrowser, then install the addons from their respective adddon store. A web browser with uBlock Origin (or another ad-blocker Enhancer for YouTube has one build-in, but uBlock is universal and more powerfull, in addition to allowing to also remove non-advertisement parts of the website, like the top shelf with recommended tags / search querries), Enhancer for YouTube, SponsorBlock and Return YouTube Dislike.NewPipe fork by polymorphicshade, which includes SponsorBlock support.NewPipe (which you should have either way for youtube-dl/yt-dlp integration).These are the current alternatives (with links when possible):

NONE OF THESE CLIENTS ARE VERIFIED BY ME FOR SECURITY OR ANYTHING ELSE! USE AT YOUR OWN RISK!

Youtube vanced official reddit