Android

Official:

SponsorBlock supports https://m.youtube.com

This can be used with Firefox Beta (Recommended), or with any chromium browser that supports extensions such as

• Kiwi Browser

To try it on Firefox, you must add the SponsorBlock add-on to a custom add-on collection and use this to install the extension.

• To create a new collection, you might need to use "Request desktop site" on the collection edit page to be able to see SponsorBlock. You also might need to remove mentions of "Android" in the URL
• If you don't want to make your own collection, you can use mine:

Collection Owner: 13499177

Collection Name: SponsorBlock

To try it on a chromium browser, download the normal extension for Chrome.

3rd-Party:

• There is a fork of NewPipe that supports SponsorBlock. Enable it in settings.
• SkyTube has support for SponsorBlock
• LibreTube is an Android client for Piped
• There are Android TV apps as well.