Effective date: June 7, 2026

This Privacy Policy explains how we collect, use, and protect your personal data when you use the Tesseract Go mobile application (the “App”, the “Service”). Tesseract Go is a learning app that turns a photo of a math problem, or a typed question, into an animated solution video.

Data controller (GDPR) / data controller under Türkiye’s KVKK: Aşkın Kadir Çekim, Schwetzinger Straße 63, 76139 Karlsruhe, Germany.

1. Who this policy covers

This policy covers end users of the App. The App is only a client; your data is processed on our servers and by the service providers listed below.

2. Information we collect

We collect information only when we have a reason to — to provide the Service, to communicate with you, or to improve the Service.

Information you give us directly

• Account information: If you register with email and password, your name, email address, and password. Your password is not stored on your device; it is sent to our servers only with the sign-up/sign-in request and is kept in hashed (encrypted) form on the server.
• Sign in with Google or Apple: If you use these options, we receive the identity token (id-token) the provider issues and create your account from it.
• Content information: The question photos you upload and the question text you type to request a solution. This content is sent to our servers to generate your solution video.

Information we collect automatically

• Session and identity information: Your user ID and your session token. The session token is stored in a secure, hardware-backed area on your device (iOS Keychain / Android Keystore) and is deleted when you sign out.
• Device and notification information: A push notification token and your device name, so we can send functional notifications such as “your video is ready.”
• Language preference: Your device language is read to set the interface and video language; this preference stays on your device.

Content we generate

• The solution videos and their thumbnails we generate for you are stored so you can access them in your library.

Information we do not collect