Last updated: 1 August 2026
Hemra is a migraine and headache diary. It was built so that the record of your own symptoms stays yours. This page describes exactly what the app does with data, in plain terms.
Everything you enter. Attacks, their timing and severity, where the pain was, symptoms, aura, medicines and doses, daily check-ins, questionnaire scores and notes are stored in a database on your device. None of it is uploaded, and there is no account to create.
If you delete the app, that data is deleted with it. Hemra keeps no copy.
If — and only if — you allow location access, Hemra looks up the air pressure and humidity where you are, because barometric change is associated with migraine in a large part of the population.
If you allow notifications, reminders are scheduled locally on your device. No push server is involved and nothing is sent anywhere to deliver them.
Hemra can produce a PDF report for your doctor and spreadsheet files of your raw records. These are created on your device and go wherever you send them through the share sheet. Hemra does not transmit them.
Hemra is not directed at children and collects no information about them.
Hemra is not a medical device. It does not diagnose, does not recommend medicines or doses, and does not predict attacks. It reports what you recorded, including how your medication days compare with the published ICHD-3 §8.2 overuse thresholds, so that you can discuss it with a clinician.
If this policy changes, the updated date above changes with it.
Hemra stores your diary on your phone. The only request it ever makes is for the weather where you are.