Not exactly YouTube, but lets you play audio from YouTube videos.

If you manage to install an IPA but see an "Update Required" message, you may need to spoof the version by editing the app's internal files.

On your iOS device, go to , find your Apple ID, and tap Trust . Method 2: AltServer-Patcher / Legacy Extenders

The app downloads an older version but displays a "Switch to YouTube.com" or "Update Required" blocking screen upon launch. Where to Find the Best YouTube IPA Files

This creates an icon on your home screen that acts like an app. 2. Download the "Last Compatible Version"

(Recommended to upload to a file host like MediaFire, Google Drive, or a dedicated IPA repository)