SponsorBlock

SponsorBlock is a browser extension and open API via crowdsource for skipping sponsor segments in YouTube videos. It’s open-source. Users submit when a sponsor happens from the extension, and the extension automatically skips sponsors it knows about using a privacy preserving query system. It also supports skipping other categories, such as intros, outros and reminders to subscribe, and skipping to the point with highlight.

Integrated into online front-end (Required setting): Invidious, Piped, CloudTube
Integrated into apps. SponsorBlock’s API is called by some apps. So is Piped above. Click here for list: https://github.com/ajayyy/SponsorBlock/wiki/3rd-Party-Ports