Inclusion Criteria:  Age 18-75 years old. Must have at least a 6-month history of headaches that meet the ICHD-3 diagnostic criteria for migraine with or without aura, either chronic (at least 15 days of HA/ month with migraine days (migraine with and without aura) at least 8 days/ month for > 3 months) or non-chronic migraine. History of 6 to 24 headache days per 28-day period for each of the 3 months preceding study enrolment (based on participant report). Subject on prophylactic migraine treatment are permitted to remain on 1 medication with possible migraine-prophylactic effects if the dose has been stable for at least 2 months prior to the screening visit, and the dose is not expected to change during the course of the study. Have personal access to a smartphone (24/7). Must be able and willing to comply with the protocol. Must be able and willing to provide informed consent..  Exclusion Criteria:  An active implanted electrical and/or neurostimulator device (e.g. cardiac pacemaker, cochlear implant). Uncontrolled epilepsy. History of use of opioids or barbiturates on more than 4 days a month in the last 6 months. Current participation in any other interventional clinical study Subject without basic cognitive and motor skills required for operating a smartphone. Pregnant or breastfeeding. Other significant pain, medical or psychological problems that in the opinion of the investigator may confound the study assessments. Prior experience with the Nerivio device.