Privacy
Last updated 17 August 2026. Controller: Nurhak Altin, the Netherlands. Contact: hallo@hodierna.app
The short version. Hodierna stores what you type into it so that you and the people you invite can read it back. Nothing is sold, nothing is shared with advertisers, and nothing is used to train anybody's models. Your data lives in Europe. You can export all of it or delete all of it, at any time, without asking us.
What we store
What you write down
Everything you log about your baby: feeds, nappies, sleep, temperature, weights and lengths, medication, vaccinations, appointments, notes, milestones and moods. Any photos you attach. Any documents you upload if you use Premium.
Health data about a baby is a special category of personal data under the GDPR. We process it on the basis of your explicit consent, which you give by entering it, and which you can withdraw by deleting the data or the account.
Your account
Your email address, your name if you give one, and your profile picture if your sign-in provider supplies one. Sign-in is handled by Clerk; we never see or store your password.
What we do not store
- Payment details. Subscriptions are handled by Apple or Google. We receive only whether a subscription is active — never a card number, never a name on a card.
- Location. The app does not request it.
- Your contacts, photos library, or anything else on your phone. Only the photos you explicitly choose to attach.
- Advertising or tracking identifiers. There are no third-party analytics, no advertising SDKs and no cross-app tracking in Hodierna.
Where it is stored
On Cloudflare's infrastructure. As of 17 August 2026 the database and file storage both report a Western Europe location. Some processing — the part that answers a request — happens at the Cloudflare location nearest to you, which for users in Europe is in Europe.
Your phone also keeps a complete copy so the app works with no signal. That copy is removed when you sign out.
Who can see it
You, and only the people you invite. Every request is checked against your permissions on the server, not merely hidden in the app.
When you invite someone you choose what they may do — view, add entries, add notes, manage access — and when their access ends. Access granted to a kraamverzorgende or verloskundige has an end date by default, and stops on its own.
We do not read your logbook. We can technically access the database to operate and repair the service, and we do not do so casually.
Who we share it with
Only the suppliers needed to run the service, each of them a processor acting on our instructions:
| Who | What for | Where |
|---|
| Cloudflare | Hosting, database, file storage, the AI features | EU (Western Europe) |
| Clerk | Sign-in and account management | US, under EU standard contractual clauses |
| RevenueCat | Knowing whether a subscription is active | US, under EU standard contractual clauses |
| Apple / Google | Payments, and delivering notifications to your phone | Per their own terms |
| Expo | Delivering app updates | US, under EU standard contractual clauses |
We do not sell personal data, and we have never disclosed any to a government or law enforcement body. If we were compelled to, we would tell you unless legally prevented.
The AI features
If you use the Premium features that read your writing or your documents, that text is sent to Cloudflare Workers AI to be processed and the result is returned to you.
- It is not used to train any model, ours or anyone else's.
- Answers about your documents are grounded only in your own documents.
- The free tier sends nothing to any AI service.
Notifications
If you turn on reminders, a token identifying your device is stored so a notification can reach it. Reminder text names your baby's first name and how long since a feed was logged — nothing else. Delivery goes through Apple's and Google's services.
Night Watch alarms are scheduled on your phone itself and involve no server at all.
How long we keep it
Your logbook is kept while your account exists, because the point of a logbook is that it is still there later. Delete your account and everything is removed within 30 days, backups included.
Note that if a professional carer records care in your logbook as part of her job, her employer may have a separate legal duty to retain that record — that duty is theirs, not ours, and they will tell you about it.
Your rights
Under the GDPR you may ask for a copy of your data, correct it, delete it, restrict or object to processing, or receive it in a portable form. Most of this you can do yourself in the app, immediately and without asking. For anything else, email hallo@hodierna.app and we will respond within 30 days.
If you are unhappy with how we have handled it you can complain to the Autoriteit Persoonsgegevens, the Dutch data protection authority.
Children
Hodierna is used by adults to keep records about their own child. The account holder must be 16 or older. The child is not a user and has no account.
Changes
If this policy changes in a way that matters, you will be told in the app before it takes effect — not by a silent edit to this page.