Privacy policy

Last updated: 10 November 2026

cinnabar is a Zi Wei Dou Shu (紫微斗数) app made by an individual developer. This policy explains what the app keeps about you, why, where, and how to remove it. The developer is the data controller; write to privacy@cinnabar.cliffdao.com with any question.

Without an account

You can use the app without signing in. Your birth details, charts, the people you add and your settings then stay on your phone and are not sent to us, except when you use a feature that needs our server (asking a question, generated readings), which sends the chart data needed for that request.

What we keep when you sign in

Signing in with your email lets you keep your charts across devices. We then store:

• your email address, a display name if you set one, and your language;
• your sign-in sessions (a device name such as “iPhone”, and when you signed in);
• the birth details and charts you save, and the people you add;
• the questions you ask, the answers and readings generated for you, and how many you used each day;
• feedback you send us, and 👍/👎 ratings on readings.

Why

Only to run the app: drawing and syncing your charts, generating readings and answers, applying daily limits, keeping your account secure, and fixing problems. We show no ads, sell no data, and use no third-party analytics.

AI-generated content

Readings and answers are written by AI (Claude, by Anthropic) and are meant for entertainment and self-reflection, not advice. To produce them, the relevant chart data and your question are sent to Anthropic. Under its commercial terms Anthropic does not use this data to train its models.

Who else handles your data

A few services process data on our behalf, only for the purposes above:

• Amazon Web Services: our servers, database, backups and email (Amazon SES), in the US West (Oregon) region;
• Anthropic: generating readings and answers;
• Sentry: error reports, with personal details such as birth data, messages, tokens and email addresses removed;
• Apple: the App Store, payments, and Sign in with Apple if you choose it.

How long we keep it

• your account data: until you delete your account;
• database backups: 7 days;
• sign-in codes: 1 day; expired sessions: 7 days after they expire;
• feedback: 2 years (made anonymous if you delete your account);
• the reason you give when deleting your account: 2 years, without anything that identifies you;
• server error logs: 14 days.

Deleting your data

In the app, go to Me → Account → Delete account. Your account and its data are deleted at once and cannot be restored. Only your email address is kept, for up to 3 days, to send you the confirmation; backups are cleared within 7 days. Without an account, Me → Clear data on this phone removes everything stored on the device. A subscription is billed by Apple and must be cancelled in your Apple ID settings.

To receive a copy of your data, or for any other request about it, write to privacy@cinnabar.cliffdao.com.

Children

The app is meant for people aged 13 and over. We do not knowingly collect data from younger children; if you believe a child has given us data, contact us and we will delete it.

Changes

If this policy changes, the new version is published here with a new date. Important changes are also announced in the app.