Trackpad Draw Turns a MacBook Trackpad Into a Pressure-Sensitive Canvas

Field notes

The interface exposes both the drawing result and the input signal: a force readout, pressure percentage, and peak value show what the trackpad is sensing. Pressure can control size or opacity, with keyboard shortcuts for undo, saving, brush size, and opacity. The page states that drawing data stays on the Mac, while the included PNG save function provides an explicit output path.