Privacy policy
Last updated: 9 November 2026
Migraday is a diary for headaches and migraine. What you enter is about your health. That’s why the app is built so that we never receive your diary and cannot see it.
In short
- Your diary is stored on your iPhone.
- With Premium you can keep a backup in your own iCloud. We can’t access it.
- There is no account and no server of our own.
- Apple Health is read only (menstruation and sleep), and not stored or shared.
- Purchases go through Apple and RevenueCat, with an anonymous app user ID and your purchase details.
- No ads, no analytics or tracking services.
Who we are
Migraday is made by Bel Applications. You can email privacy questions to support@migraday.com.
What you enter in the app
In Migraday you can keep track of, for example, when you had a headache, what kind (migraine, other headache or don’t know), how bad it was, which symptoms you had, which medication you took and whether it helped, and daily factors such as sleep, stress, food and drink. Your answers to the daily question and your own notes are part of this too.
This data is stored on your iPhone, in the app and in shared storage on your device that the widgets use. It is not sent to us.
iCloud backup
With Premium the app can store your diary in the private database of your own iCloud account (Apple CloudKit), so it’s also on a new or second iPhone or iPad. You can turn this off in the app’s settings.
This data is held by Apple, under your own Apple Account, and is covered by Apple’s privacy policy. We have no access to it.
Apple Health
With Premium, and only if you give permission, Migraday can read data from Apple Health: menstruation and sleep. It is shown in the calendar, in insights and in the headache summary.
The app writes nothing to Health. Data from Health is not stored in your diary or in iCloud, not shared with us or anyone else and not used for advertising. You can withdraw permission at any time in Settings → Health → Data Access & Devices → Migraday.
Purchases (RevenueCat)
You buy Premium through the App Store; payment is handled by Apple. We never see your name or payment details.
To check whether you have Premium, the app uses the RevenueCat service (RevenueCat, Inc.). This involves an anonymous app user ID, created by the app itself, and your purchase details (such as which product, when it was bought and whether it’s still valid). Your diary is not sent to RevenueCat. See also RevenueCat’s privacy policy.
Notifications
Reminders, such as the daily question and the question whether your medication helped, are scheduled on your iPhone itself. No data is sent to us for this. You can turn them off in the app or in your iPhone’s settings.
Exporting and sharing
You can create a CSV file or a headache summary (PDF) yourself and share it via the share sheet, for example with your doctor. This only happens when you do it. You decide who you share it with.
No ads and no tracking
The app contains no ads and no analytics or tracking services. We don’t build a profile of you and don’t sell data.
Keeping and deleting
Your data is kept for as long as you leave it in the app. You can delete headaches and other entries in the app. If you delete the app, the data is removed from your iPhone.
If iCloud backup is on, you can delete that data via Settings → your name → iCloud → Manage Storage → Migraday.
Your rights
You have the right to access, correct and delete your data. Because we don’t receive your diary, you do this yourself in the app. If you have a question or request, email support@migraday.com. You can also file a complaint with your data protection authority (in the Netherlands: the Autoriteit Persoonsgegevens).
This website
This website sets no cookies and uses no analytics or tracking services. As is usual, the hosting provider may keep technical log files (such as IP address and time) for security and to keep the site running.
Changes
When the app changes, we update this privacy policy. The date at the top shows when it was last updated.