Your account is yours — your data, your control. Everything in this article lives under the You tab, in the Account section near the bottom. Here's how to handle the day-to-day stuff, and how to walk away cleanly if you ever decide to.
Signing in
You can sign in to DayByDay three ways: with an email and password, with Continue with Google, or with Continue with Apple. Whichever you choose, your data is stored in the cloud and synced to every device you sign in on — the iPhone app and the web app at web.mydaybyday.app show the same account.
Signed in with Google or Apple?
Then you don't have a separate DayByDay password — Google or Apple handles your login. To change it, update your Google Account or Apple ID password in their settings, not here.
Changing your email
To change your email, email support@mydaybyday.app from the address you signed up with.
Changing your password
To change your password, sign out, then use Forgot password on the sign-in screen — we'll email you a reset link.
Editing your profile
Your name, height, sex, starting and goal weight, and phase all live on the Profile card in You. These shape your progress bar, projections, and body-composition numbers, so it's worth keeping them current — and you can change any of them anytime with no penalty. For the full rundown, see Settings reference.
Exporting your data
Your data is portable, always. From You → Reports & Export you can download a doctor-ready PDF or a CSV of any table — weight, GLP-1 doses, sleep, measurements, labs, exercise, nutrition, and more. It's a great idea to grab a copy before any big change to your account. Full details are in Reports & your doctor.
Deleting your account
Deletion can't be undone
Deleting your account removes your profile and everything you logged (weight, medication, sleep, food and water, measurements, labs, mood, symptoms and more), your photos, and your sign-in account. It starts the moment you confirm and finishes within minutes. It can't be undone. Your App Store subscription is separate: cancel it in iPhone Settings, under your name, then Subscriptions. Anything DayByDay saved into Apple Health stays in Apple Health. Copies in automatic backups are replaced as they expire (about 7 days). We keep three things after deletion: a short record that the account was deleted (its random id and dates, no name or email) for two years; our payment service's purchase record (billing history, no health information); and the staff action log, which is a security record. Emails you sent to support, and files you exported yourself, are not covered by the button. If you'd like to keep a copy, export your data first (You → Reports & Export).
- 1Export your data first if you want to keep it (You → Reports & Export).
- 2Open Settings, then Account, and scroll to the bottom.
- 3Tap Delete Account & All Data.
- 4Read the confirmation and tap the red Delete Everything button.
Cancel your subscription first
Deleting your account doesn't automatically cancel an App Store subscription. Cancel it separately in iPhone Settings, under your name, then Subscriptions, so you're not billed again — see Plans & billing for more.
Run into trouble? Email support@mydaybyday.app and we'll take care of the deletion for you. Your data is encrypted, never sold, and never used for ads — see Privacy & legal for the full promise.