A webcam eye-tracker you train in about a minute, then a tiny game you play with your gaze and blinks. No install: it runs entirely in your browser.
Enable your camera. It stays on your device; nothing is ever uploaded.
Calibrate. Follow the dot around the screen, and it keeps training until it can tell where you're looking.
Test or Play. A marker tracks your gaze. In Blink Zap, look at a π and blink to zap it, and dodge the π£. In Snake, look where you want to go and eat π to grow.
Works best in Chrome, with even light on your face and your head about arm's length away. Once you're in, hit Fullscreen for the full experience.