PipeBender

Even better: PipeBender plays the audio from videos in the background, making it perfect for multitasking. You can listen to music, podcasts, or video essays on YouTube while doing chores, all without the need to keep the screen on. It also offers picture-in-picture mode, so you can watch videos while using another app, and downloads videos so you can watch them offline. These are features you'd otherwise need a paid YouTube Premium subscription for to get in an app