A Tuesday, 14:34
Log it in seconds
An episode starts with a couple of taps, even mid-attack: intensity, side, medication. The diary keeps the time for you; add detail later, when you feel up to it.
Log an episode in seconds, follow your patterns, and bring a clear report to your doctor. Built on clinical guidelines. Everything stays on your iPhone.
Cephalo is a diary first: quick to write in when your head hurts, clear to read back when someone asks how often.
Illustrative diary with example data.
A Tuesday, 14:34
An episode starts with a couple of taps, even mid-attack: intensity, side, medication. The diary keeps the time for you; add detail later, when you feel up to it.
That evening
A short evening check-in captures how the day went: a few taps and done. Headache-free days count too; they are what your patterns are measured against.
A Friday
Enough entries, and the diary starts answering back: triggers weighed with confidence levels, patterns you can question. Every number says where it came from.
When you see the doctor
A month reads at a glance, color-coded by intensity with aura marked. For the appointment itself, the diary condenses into a doctor-ready PDF: episodes, medication, patterns.
No sign-up, no email, no login. You download the app and start writing.
Check it: the App Store privacy label lists what the app collects.
The whole diary works without internet. Your entries are never uploaded to us; insights are computed on your device.
Check it: turn on airplane mode and the diary keeps working.
Everything is stored locally on your iPhone, readable and removable by you alone.
Check it: export or delete all of it, any time, from inside the app.
When light hurts, the last thing you need is a bright screen. Cephalo's dark mode dims every surface and keeps the contrast gentle, so logging an episode at 3 a.m. doesn't make it worse.
Cephalo follows clinical guidelines for headache care, including the Dutch NHG-Standaard Hoofdpijn and international best practices for headache diaries, so what you record is what your doctor needs to see.
Cephalo is a diary, not a doctor. It never gives medical advice; take your report to a healthcare professional you trust.
The diary has no time limit. Cephalo Plus adds personal analysis, doctor-ready PDF reports, and CSV export.
Forever, for everyone
$24.99/year, or a one-time $49.99 lifetime unlock
Prices in USD; the App Store shows your local price before you pay. Your data is never behind the paywall.
Yes. Unlimited logging, your complete editable history, 7-day basic insights, the MIDAS questionnaire, and a full JSON backup are free. Cephalo Plus adds personal trigger and pattern analysis, longer insight periods, weather correlation, and PDF and CSV exports.
No. There is no sign-up, no email, and no login. You can start logging immediately after downloading the app. Read more about keeping a migraine diary without an account.
On your device. If you enable the optional iCloud sync, your data is also stored encrypted in your personal iCloud account. It is never uploaded to us.
Not for your health data; headache entries stay on your device. The app sends minimal first-party reliability statistics (installs, sessions, never your entries; see the privacy policy). Two optional features use the network: weather lookups through Apple's WeatherKit, and private federated learning, an opt-in way to improve the shared pattern model that shares only encrypted, anonymous updates.
Not yet. Cephalo is currently iOS-only. An Android version may follow based on demand.
The next appointment goes better with three weeks of real data in your pocket
Free to download • No account required • Your data stays yours