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Dayary Privacy Policy

Effective date: August 26, 2026

1. Overview

Dayary (the "App") is provided by Zero One Studio. This policy explains what information the App handles and how.

2. Information we collect

  • Account identifiers — We store an account identifier needed to provide the service. If you use social sign-in, we receive an identifier and email address from that provider.
  • User-entered content — Content you enter in the app (lists, records, nicknames, etc.) is stored to provide app features.
  • Purchase history — We check purchase history to process payments and restore purchases. Payment details such as card numbers are handled by the App Store / Google Play and are never stored by the studio.
The first time you save a diary you sign in with Apple or Google. We receive an account identifier and email address (if you choose Hide My Email, only the relay address Apple creates). Diaries (date, weather, title, text, sticker layout), stamps and red-pen notes, the name you use in a notebook, and when you confirmed you are 14 or older are stored on the device and on a Supabase server (Seoul region) so you can continue on a new phone. Diaries you add to a notebook are visible only to the people who share that notebook; a diary you make a web link for can be viewed by anyone with the link, and you can turn the link off at any time. Sticker suggestions are made on the device only; diary content is never used for recommendations or analytics. There are no ad or analytics SDKs. Send feedback sends your text together with the number of diaries and notebooks and whether you subscribe. Purchases are handled by the App Store and Google Play; the app only checks your subscription status. Settings > Delete account immediately erases your diaries, notebook records and sign-in account from the server.

3. How we use it

Collected information is used only to provide app features, diagnose errors, and serve ads. We do not profile users for identification and never sell data to third parties.

4. Third-party services

The App uses the services below; each service's own privacy policy also applies.

  • Supabase
  • Sign in with Apple
  • Google Sign-In
  • App Store / Google Play billing

Retention and deletion

Data stored on your device is deleted when you delete the App. To request deletion of data stored on our servers, contact us at the email below.

Children's privacy

The App is not directed at children under 14 and does not knowingly collect personal information from children.

Contact

Questions about this policy: contact@zeroonestudio.app

Changes

Any changes to this policy will be announced on this page.