Open Seizure Detector is an epileptic (tonic-clonic) seizure detector / alert system that utilises a smart-watch to detect shaking or abnormal heart rate, and raises an alarm for a carer. If the wearer of the watch shakes for 15-20 seconds, the device will produce a warning. If the shaking continues for another 10 seconds it raises an alarm. It can also be configured to raise alarms based on measured heart rate or O2 saturation.

The phone app communicates with the smart-watch and can raise alarms in one of three ways:
- Local alarm - the phone emits an alarm sound.