Nightcorer is a simple tool for making fast-paced videos with a tempo that matches their pitch. Its purpose is to take your YouTube videos and "nightcore" them so that it matches your preferred speed.

The idea of this app is that it doesn't change the pitch or tempo of the video, just speeds it up. There is a slider for the speed, and it works on all YouTube videos. The pitch goes up to 1.0 times and the tempo goes up to 1.00 times. But it only works for those that have a certain kind of audio file — that's because it's a speed up, so you can't do a slow-down and go down in pitch as well.

And as if that wasn't already cool enough, it will even make it even more nightcore with an anime shader that applies itself to the video while the extension is active.