VTube Studio

VTube Studio (by DenchiSoft) is the most widely used VTuber app: load a Live2D model and it tracks your face through a webcam or your phone, driving the avatar’s expressions and movement in real time, with 3D model support too. It’s deep but approachable, with a big community and broad model compatibility, which is why it’s the default starting point for most 2D VTubers. The app is free to use; an optional paid version on Steam removes the small on-screen logo and supports the developer.