Privacy Policy

Hanzi is an offline Chinese vocabulary app. This policy explains what the app stores, what it does not, and what third-party services it uses.

1. What stays on your device

Everything you do in the app is saved locally on your phone: which words you have studied, your correct and wrong answers, starred words, custom word lists, daily statistics, your settings, and whether you have removed ads.

This data never leaves your device unless you export a backup file yourself. The app has no account system and no server. Uninstalling the app, or using Me → Reset progress, removes it.

2. What we do not collect

• No account, name, email address or phone number.
• No upload or cloud sync of your study data.
• No access to your photos, contacts, files, microphone or precise location.

3. Advertising

The free version shows occasional full-screen ads supplied by Google AdMob. To serve and measure those ads, the Google Mobile Ads SDK may collect a device identifier (such as the advertising ID), approximate location derived from your IP address, and ad interaction data. This information is shared with Google and its advertising partners and is used for advertising, analytics and fraud prevention. It is not linked to your study progress, because we never send your progress anywhere.

If you buy Remove ads, no ads are requested and no ad SDK data is collected after the purchase is processed. See Google's practices at policies.google.com/technologies/partner-sites.

4. Purchases

In-app purchases are processed entirely by Google Play. We receive only the confirmation that a purchase was completed — never your card details, billing address or Google account information.

5. Links to other sites

The app contains an optional link to italki, a third-party tutoring marketplace. Tapping it opens your browser and you leave the app; whatever you do on that site is covered by italki's own privacy policy, not this one.

6. Children

Hanzi is not directed at children under 13. We do not knowingly collect any personal information from children. Because the app has no accounts and no servers, there is no profile of any user to collect.

7. Deleting your data

Use Me → Reset progress to erase your learning record, or uninstall the app to erase everything on the device. For any request about advertising data collected by Google, write to the address below and we will help you direct it to Google.

8. Changes

If this policy changes, the effective date above is updated and the new version is published at this URL before the change takes effect.

9. Contact

ryin.dev@gmail.com