It cannot diagnose microsleep
A camera-visible closure is not a clinical diagnosis, and open-eye attention lapses may not be visible to the app.
Environment affects the signal
Poor light, backlighting, camera angle, distance, face obstruction, sunglasses, and device movement can reduce reliability.
Platforms differ
iOS, Android, macOS, and Windows use different camera and face-processing stacks. Behaviour and hardware support are not identical.
Alarms have limits
Browser or operating-system audio settings, disconnected speakers, headphones, focus modes, and hardware volume can affect whether an alert is heard.
Written by the EyeJolt Editorial Team. Published and last reviewed 2026-07-14. Editorial policy.