Hand Tracer lets you conduct with your hands. It draws a skeleton over each hand and trails particles from your fingertips.
It uses MediaPipe's HandLandmarker, set to follow up to two hands. For every frame the model predicts 21 points per hand, which is enough to rebuild the skeleton and know where each fingertip is. Pinching is detected by measuring the distance between thumb and index tip. Nothing is uploaded.
Fingers that overlap or hide behind each other are the hardest case for the model.