Android

Official:

SponsorBlock supports https://m.youtube.com

This can be used with Firefox. You can then install it directly from the Firefox Add-ons store like normal (No collections are needed anymore).

It's also possible to use it on a chromium browser, such as Kiwi Browser, from the Chrome Extensions Store, but Kiwi Browser is not recommended.

3rd-Party:

• ReVanced allows you to patch the original YouTube app with support for SponsorBlock
• LibreTube is an Android client for Piped
• Tubular is a fork of NewPipe that supports SponsorBlock. Enable it in settings.
• SkyTube has support for SponsorBlock
• Clipious has support for SponsorBlock
• Sponsor Skip can skip segments in the original YouTube app by controlling the notification seek bar
• There are Android TV apps as well.