Privacy Policy

        Short version: Yanso does not collect, store, transmit, or share
        any personal information. The app works entirely on your device with no account,
        no sign-in, and no internet connection required.
      

1. Who we are

Yanso ("Ya Nso'") is a free, open-source Flutter application developed and maintained by the Yanso contributors. The project is hosted at github.com/vector-gru/yanso.

The app is distributed through the Google Play Store. Questions or concerns about this policy can be raised by opening an issue on the GitHub repository.

2. Information we do not collect

Yanso is a fully offline calendar application. We do not collect, process, or transmit any of the following:

Personal identifiers (name, email address, phone number, device ID)
Location data
Usage analytics or crash reports
In-app behaviour or interaction logs
Device information or advertising identifiers
Contacts, photos, or any other device content
Financial or payment information

There are no user accounts, no sign-in, and no server-side infrastructure associated with the Yanso app.

3. How the app works

Yanso reads the current date from your device's system clock in order to display today's Nso date. This calculation is performed entirely on-device using a deterministic algorithm. No date, location, or any other information leaves your device.

All calendar data — the eight Nso weekdays, the twelve Lamnso months, and the conversion algorithm — is bundled with the app at install time. No network request is ever made.

4. Permissions requested

Yanso requests no special Android permissions beyond the minimum required to run a Flutter application. Specifically, the app does not request access to your:

Camera or microphone
Contacts or calendar
Location (coarse or precise)
Storage or files
Network or internet

5. Third-party services

Yanso does not integrate any third-party SDKs, advertising networks, analytics platforms, or social login providers.

The app is distributed through the Google Play Store. Google's own privacy practices apply to the download and installation process, independent of this policy. Please review Google's Privacy Policy for details.

6. Children's privacy

Yanso does not knowingly collect any information from anyone, including children under the age of 13. Because no data is collected at all, the app is safe for users of any age.

7. Open-source transparency

The complete source code of Yanso, including the calendar engine and the Flutter application, is publicly available at github.com/vector-gru/yanso under the MIT licence.

Anyone can inspect the code to independently verify that no data collection, network communication, or tracking is present.

8. Changes to this policy

If the app ever introduces features that change its data practices (such as optional cloud sync or community contributions), this privacy policy will be updated before those features are released, and the effective date at the top of this page will be revised accordingly.

Changes are tracked in the project CHANGELOG.

9. Contact

If you have any questions about this privacy policy or about how Yanso handles your data, please open an issue on the GitHub repository:

github.com/vector-gru/yanso/issues