What you log stays on your phone.

Adler has no account, no server and no analytics. Nothing you log is sent anywhere. This page says exactly what the app touches.

Last updated 14 October 2026

What Adler stores

Your treatment, your doses and patch sites, the symptoms you tap, your notes, your appointment and your questions are saved in a database on your iPhone. There is no sign-in, no email address and no password. Nothing about you sits on a server, because Adler doesn’t have one.

The Home Screen and Lock Screen widget reads your next patch or dose day from the same database on the phone. It makes no network call.

Delete the app and everything goes with it. The only copy that survives is a backup file you export yourself.

Apple Health

If you turn it on in Settings, Adler reads your sleep from Apple Health: the hours asleep and the times you woke. It reads nothing else and never writes to Health. That sleep data is shown to you on Progress and on your doctor page, and kept out of the app’s own storage and its backup file. It leaves your phone only if you share your doctor page yourself. Health data is never used for advertising or marketing.

You can say no, or switch it off later in Settings or in the Health app. Adler works the same without it.

Voice notes

If you hold the microphone to say a note, the words are turned into text on your phone. The recording is not uploaded and not kept.

Face ID

You can lock Adler with Face ID or your passcode. iOS does the check; Adler only learns whether it passed.

Reminders

Patch, dose and appointment reminders are local notifications scheduled on your phone. No push service is involved.

The doctor page and backups

The one-page summary is made on your phone. It leaves only when you print it or share it, and then it goes where you send it. The same is true of a backup file you export.

Purchases

Subscriptions and the one-time purchase are sold through the App Store. Apple handles payment, so Adler never sees your name, card or billing address. The app only learns whether a purchase is active on your Apple ID.

What Adler sends

Nothing. There are no analytics, no crash reporting, no advertising and no tracking in the app. If that ever changes, this page changes first and the app will say so.

This website

This site sets no cookies and runs no analytics. The host, Vercel, sees your IP address when the page loads, like any web server. The headline font is loaded from Fontshare.

Contact

Adler is made by one person. Questions about this page go to support@tryadler.app. If you email, I get your address and what you write, and use them only to reply.