Privacy Policy

Last updated: June 2026

Synastrix ("we", "our", or "us") is committed to protecting your privacy. This policy describes how the Synastrix app handles your information.

Information We Collect

Synastrix is a local-first app. The core compatibility features work entirely on your device — no account required, no data sent to our servers.

Birthdate input: Birthdates you enter are stored locally on your device using encrypted on-device storage. They are never transmitted to Synastrix servers.
Saved profiles: Compatibility results and saved person profiles are stored locally on your device and are not synced to any cloud service.
Subscription information: In-app purchases are handled entirely by Apple App Store or Google Play. We do not store your payment information. RevenueCat, our subscription management provider, processes and stores subscription status — see the RevenueCat Privacy Policy for details.

AI Deep Reading (Premium)

Premium subscribers may request an AI-generated compatibility reading. We ask for your explicit permission in the app before any data is sent, and you can turn this off at any time in your profile settings.

Where the reading is generated: AI readings are produced by an open-source AI model that we run on our own infrastructure, hosted by our infrastructure provider, Cloudflare (the same provider that hosts the rest of the Synastrix backend). Your data is not shared with any separate AI company (such as OpenAI, xAI, or Google) — it stays within our own backend. Cloudflare processes the data only as our hosting provider; see the Cloudflare Privacy Policy.

Exactly what is sent when you request a reading:

The two Western zodiac signs in the match
The two Chinese (lunar) zodiac signs and their elements
The Western aspect and Chinese relationship type between the signs
The numeric compatibility scores and overall label

What is never sent: we do not send names, birthdates, photos, contacts, email addresses, location, or any other personal or device-identifying information. Only the zodiac signs, elements, and compatibility scores above are processed to generate your reading.

We do not store the content of AI readings on our servers; readings are cached locally on your device.

Analytics and Crash Reporting

We do not currently use any third-party analytics or crash reporting services. If this changes in the future, this policy will be updated and you will be notified through an app update.

Device Permissions

Synastrix may request the following permissions, each only when you initiate the related feature:

Contacts — Premium subscribers can import contacts to quickly set up matches. Contact data (name and birthday) is read on-device and never sent to our servers.
Photo Library — Used when you choose a profile photo from your gallery. Photos are stored locally on your device.
Camera — Used when you choose to take a new profile photo. Photos are stored locally on your device.
Network — Required for premium AI readings and subscription validation.

Synastrix does not request access to your microphone, location, or any other device sensor. All permissions are optional and the core app functions without them.

Children's Privacy

Synastrix is not directed to children under the age of 13. We do not knowingly collect personal information from children under 13.

Data Retention and Deletion

Since data is stored locally on your device, you can delete all app data at any time by uninstalling the app. This permanently removes all saved profiles and compatibility results.

Changes to This Policy

We may update this policy from time to time. We will notify you of material changes through an app update. Continued use of the app after changes constitutes acceptance of the updated policy.

Contact

If you have questions about this privacy policy, please contact us at privacy@synastrix.app.