Megrim: Migraine Log
• New: migraine days per month, in Analytics and the PDF report.
• New: long-press the icon → Log migraine.
• Fixed: Android backup now includes your diary.
• Suspected factors are more accurate: each migraine counts once, on its first day, and pressure is compared fairly. Your odds ratios will change.
Megrim is an open-source, offline-first migraine diary that helps you find your personal triggers. The app automatically adds time-of-day, season, daylight, and moon context to your entries — and, if you opt in, local weather and barometric pressure — calculating correlations entirely on your phone. With no accounts, no cloud servers, and zero tracking, your health data stays completely private and under your control.
What's inside:
* Automatic on-device enrichment — daylight hours, time of day, season, and moon phase computed locally; opt in to add local weather and barometric-pressure change (24h/48h). No manual entry.
* Real personal analytics — migraine days per month (the last 30 days, a 3-month average and a monthly chart), trends by day-of-week, time-of-day, season, daylight, pressure change, and moon phase, plus a "suspected factors" card that uses odds ratios over your own log.
* Fast logging — one tap starts a migraine, or long-press the app icon and choose "Log migraine".
* Your data stays yours — on-device storage only, with full export and import (JSON and CSV), a printable PDF report for your doctor, and an optional backup reminder.
* Optional app lock — open Megrim with your phone's own fingerprint, face or PIN, and hide it in the recent-apps switcher.
* No accounts, no servers, no telemetry — by default the app makes no automatic network requests (the only exception is the place-name search you type when setting your home location). Weather enrichment is opt-in; when enabled, the only network request is to Open-Meteo.com, to fetch weather for the approximate (~1 km rounded) location and date of the entries you create.
* Free and open source (GPL-3.0-or-later).
Megrim is a personal diary and is NOT a medical device. It does not diagnose, treat, cure, or prevent any condition. "Suspected factors" are statistical associations in your own log — association is not causation. Always consult a qualified healthcare professional.
Weather data by Open-Meteo.com.
- Author: Steve Maegley
- License: GNU General Public License v3.0 or later
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Versions
Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.
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x86_64This version requires Android 8.0 or newer.
It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Download APK 25 MiB PGP Signature | Build Log
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arm64-v8aThis version requires Android 8.0 or newer.
It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Download APK 24 MiB PGP Signature | Build Log
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armeabi-v7aThis version requires Android 8.0 or newer.
It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Download APK 22 MiB PGP Signature | Build Log
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x86_64This version requires Android 8.0 or newer.
It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Download APK 24 MiB PGP Signature | Build Log
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arm64-v8aThis version requires Android 8.0 or newer.
It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Download APK 23 MiB PGP Signature | Build Log
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armeabi-v7aThis version requires Android 8.0 or newer.
It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Download APK 21 MiB PGP Signature | Build Log
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x86_64This version requires Android 8.0 or newer.
It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Download APK 22 MiB PGP Signature | Build Log
-
arm64-v8aThis version requires Android 8.0 or newer.
It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Download APK 21 MiB PGP Signature | Build Log
-
armeabi-v7aThis version requires Android 8.0 or newer.
It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Download APK 19 MiB PGP Signature | Build Log
• New: an optional backup reminder. Settings shows when you last exported, and can warn you after 7, 14, 30 or 90 days.
• Once the reminder is on, the Log screen shows a small green or orange backup indicator.
• New on Analytics: "Away from home" — how many entries you recorded more than 100 km from your home location, and where.
• "Travel" is now one of the default suspected triggers.