EpiWatch is a digital health initiative developed by Johns Hopkins Medicine that provides an Apple Watch-based application for seizure monitoring and research in epilepsy. The app detects potential tonic-clonic seizure events using accelerometer and heart rate data collected from the smartwatch, generating alerts that can notify designated caregivers via a connected smartphone.

The system provides a passive seizure monitoring layer using widely available consumer hardware, making it more accessible than dedicated EEG-based seizure detection systems. In addition to event detection, the app allows users to log seizures, medications, and triggers, supporting longitudinal tracking and research data collection.

EpiWatch is primarily positioned as a research and monitoring tool rather than a regulated medical device. While it demonstrates the potential of consumer wearables in neurological monitoring, its detection capabilities are more limited than clinical-grade EEG-based systems.