Draw in the air with your hands. Uses your webcam — everything runs locally in the browser, nothing is uploaded.
Edge padding — the play margin on each side, as a % of the camera view. Larger margins keep your hand in frame when the cursor is near that edge. Right & bottom usually need the most (right-hand drawing reaches there).
Line smoothing — removes tracking jitter without dulling fast intentional strokes. Higher = smoother/more organic; too high can feel laggy.