[commoner]

NewPipe also has an audio-only option. Unlike YouTube Vanced (a mod of the original YouTube app), NewPipe is open source and supports video downloading. I think the main advantages of Vanced over NewPipe are the SponsorBlock integration and the ability to log in to a Google account (if that's what you're looking for).

[newsch]

I've been very happy with this fork of newpipe that has sponsorblock built-in (it's been kept up to date with upstream so far): https://github.com/polymorphicshade/NewPipe

It started with this rejected PR: https://github.com/TeamNewPipe/NewPipe/pull/3205

[efreak]

The sponsorblock faith is also available through fdroid

[einpoklum]

How do you play Youtube clips audio-only with NewPipe?

[commoner]

On the video view, the "Background" button with the headphones icon plays the audio only. You can also hold the button to add the clip to your queue.