Privacy Policy

1. Information We Collect

• Account information: your email address and authentication identifiers when you create an account or sign in.
• Birth details: your birth date, birth time, and birth city, which you provide so we can calculate your natal chart and house placements.
• Preferences and activity: your answers to mood, pacing, and dealbreaker questions, the book matches you receive, books saved to your Library, and your "Spot on" / "Not for me" ratings.
• Waitlist information: if you join our launch waitlist (for example, to be notified when the iOS app is released), we store your email address, the platform you selected, and the time you signed up.
• Subscription status: whether you hold an active subscription or trial. Payments are processed by Apple (App Store) or Google (Google Play), depending on where you subscribe; we never see or store your payment card details.
• Basic technical data: device type, operating system version, and diagnostic information needed to keep the service running and secure.

2. How We Use Your Information

• Calculate your natal chart and current planetary transits.
• Generate and explain personalized book recommendations.
• Maintain your account, Library, and subscription access.
• Send launch notifications to people who joined our waitlist, and send important service messages.
• Improve accuracy, reliability, and security of the service.

We do not sell your personal information, and we do not use your birth details for third-party advertising.

3. Authentication and Data Storage (Supabase)

We use Supabase as our backend provider for authentication and database storage. When you sign up or sign in, your email address and authentication credentials are handled by Supabase Auth, and your profile, birth details, Library, and waitlist entries are stored in a Supabase database. Data is encrypted in transit, and access is restricted to authorized systems and personnel.

4. How We Calculate Your Chart and Use AI

Your book match is produced in two steps. This section explains exactly what data is used in each one, who processes it, and what is never shared.

Step 1: Chart calculation on our backend (no AI involved)

When you enter your birth date, birth time, and birth city during onboarding, our secure Supabase backend looks up the coordinates and time zone of your birth city using the Open-Meteo geocoding service (Open-Meteo receives only the city text you entered). It then computes your exact natal chart, Whole Sign house placements, and the current planetary transits mathematically, using the open-source astronomical ephemeris library astronomy-engine. This step is deterministic calculation. No AI is involved.

Step 2: Literary synthesis by a third-party AI provider (Anthropic, PBC, Claude API)

Only after you give explicit in-app permission, and before a book match is generated, our server sends the following data to Anthropic, PBC through its Claude API. It is used solely so the AI can select a matching book and write your personalized astrological commentary:

• Your calculated astrological chart data: natal placements, house cusps, and active planetary transits.
• Your reading preferences: reading mood, pacing preference, dealbreakers, and the titles of books you have already been matched with (so we do not repeat them).
• Your birth date, birth time, and birth city, as you entered them, included with the request.

Anthropic returns a book title, a short synopsis, and the commentary text, which we show in the app and save to your Library. We do not send your data to Anthropic without your permission.

What is never sent to Anthropic

Your email address, password, account ID, and payment or subscription records are never sent to Anthropic.

Anthropic's data protection (equal protection)

We use the Claude API only under Anthropic's commercial terms. Anthropic, PBC processes commercial API requests under strict data privacy and security obligations and does not use data submitted through the API to train its foundation models. It may retain API inputs and outputs for a limited period as set out in its terms (for example for safety, abuse prevention, or legal compliance). Anthropic provides the same or equal protection of your data as is described in this Privacy Policy. You can read Anthropic's Privacy Policy and Commercial Terms.

Recommendations are generated by automated systems and are for entertainment purposes. Book cover lookups use only the book title and author, never your personal data.

5. Sharing of Information

We share information only with the service providers that help us operate the service: Supabase (authentication and database), Open-Meteo (birth city geocoding, city text only), Anthropic, PBC (AI book matching, only the data listed in Section 4 and only with your permission), Apple (App Store) and Google (Google Play) (subscription processing, depending on where you subscribe). We also share information when required by law or to protect our rights and the safety of our users. These providers may only use your information to perform services for us.

6. Data Retention

We keep your information for as long as your account is active or as needed to provide the service. Waitlist emails are kept until we have notified you that the app is available on your platform or you ask us to remove them. When you delete your account, we delete or irreversibly anonymize your personal data within 30 days, except where we must retain limited records to meet legal obligations.

7. Account and Data Deletion

You can request deletion of your data at any time:

• In the app: delete your account from the account settings screen. This removes your Supabase Auth record, birth details, Library, and ratings.
• By email: write to imdalia@gmail.com from the address linked to your account (or the address you used for the waitlist) with the subject "Delete my data". We will confirm once the deletion is complete.

Deleting your account does not cancel an App Store or Google Play subscription. Please cancel it separately in your Apple ID subscription settings or in Google Play (Payments & subscriptions).

8. Your Rights

Depending on where you live (including the EEA, UK, and California), you may have the right to access, correct, export, or delete your personal data, to object to or restrict certain processing, and to withdraw consent. To exercise any of these rights, contact us at imdalia@gmail.com.

9. Age Requirement and Children's Privacy

Cosmic Book Match is intended only for adults aged 18 or older. We do not knowingly collect personal information from anyone under 18. If you believe a minor has provided us with data, contact us and we will delete it.

10. Security

We use reasonable technical and organizational safeguards to protect your information. No method of transmission or storage is completely secure, so we cannot guarantee absolute security.

11. Changes to This Policy

We may update this policy from time to time. When we do, we will revise the "Last updated" date above and, for material changes, notify you in the app or by email.

12. Governing Law

This Privacy Policy is governed by the laws of the United Arab Emirates as applied in the Emirate of Dubai, without regard to its conflict-of-law principles. Nothing in this clause limits any mandatory data protection rights you have under the law of your country of residence.

13. Contact Us

Questions about this Privacy Policy? Email imdalia@gmail.com.