Privacy Policy

2026-10-13

This policy explains how the operator of Sudoku AI Coach ("the app") handles your information.

1. Information we collect and how we use it

Device ID

When you first open the app, it creates a random ID for your device. It is not linked to your name or phone number. We use it to manage your daily AI coach questions, rankings, feedback, and linking to an account.

Rankings

If you join the rankings, the app sends the nickname, country and region you enter, plus the record of each clear (the puzzle, time taken, number of hints, score, and the order and timing of your entries) to our server. We use this to show rankings and to detect invalid records. Your nickname, country/region and score are shown to other players.

Location (optional)

Only when you choose "set from current location" for your ranking country/region, the app uses your approximate location. Converting it into a country/region is done by your device's operating system, and your location itself is not sent to our server.

Questions to the AI coach

When you ask the AI coach a question, the question and the content of the hint on screen (the explanation of the solving steps) are sent to our AI provider (Anthropic, PBC) to generate an answer. Our server does not store your questions except to count how many you have used. Your conversation history is stored on your device (and in your backup if you create an account).

Feedback

When you send feedback from the settings, we store its content together with part of your device ID, your OS, app version and language, and deliver it to the operator by email. There is no reply function.

Account (email verification, optional)

The email address you enter to create an account is used only to send a verification code and is not stored on our server (we store only a one-way value derived from it to recognize the same account). Emails are sent using Amazon Web Services. With an account, the app stores your records, settings, AI coach conversations and similar data on our server so you can restore them on another device. You can delete your account at any time from the Me tab; deleting it removes your backup and ranking records from our server.

Advertising

The app shows ads provided by Google AdMob. Google may collect and use information such as your advertising ID to deliver and measure ads. See Google's advertising policies for details. In the European Economic Area and similar regions, the app asks for your consent before showing ads. On iPhone, the app asks for permission to track (personalize ads across apps) before showing ads; the app works the same if you decline. You can reset or disable your advertising ID in your device settings.

2. Sharing with third parties

Except where required by law, we do not share your information with third parties for purposes other than those above. Information is sent to the AI provider, Amazon Web Services and Google only as needed for the purposes described.

3. Retention

Weekly and monthly ranking records are deleted after each period ends. Feedback is deleted after 30 days and verification codes after 10 minutes. Account backups are kept while you use the account. To request deletion, contact us as described below.

4. Children

The app is not directed at any particular age group. Users under 13 should use it with a parent's or guardian's consent.

5. Changes

If we change this policy, we will post the update on this page.

6. Contact

Please contact us from the app: Me tab → Settings → "Send feedback".