Know the pressure is dropping before your head does.

MigraineWatch checks the barometric pressure where you are and warns you ahead of a change big enough to matter — so a bad day is something you can plan for.

The Today screen for London: a red banner reading 'Elevated risk, multiple events, starts Saturday 21:00', above a seven-day outlook headed 'Elevated risk today' with a circle on each day to watch, and a symptom-free count of 5 days since a mild day on Monday 21 September.

What it does

Your health data stays on your phone

MigraineWatch has no server. There is no account, no advertising and no third-party tracking of any kind. What you record about your health is written to your device and stays there.

To fetch a forecast the app sends your approximate coordinates and time zone to Open-Meteo, the weather service it reads from, along with a place name if you search for one. Those requests carry nothing else — no identifier, and nothing about your symptoms. The privacy policy sets out the detail.