Privacy Policy

Hoppa Math — Last updated: October 7, 2026

1. Introduction

Hoppa Math ("the App") is a math exam‑practice application for students, available on Android and iOS, developed by KSD-CO ("we", "us", or "our"). This Privacy Policy explains what information we collect, why we collect it, and how you can manage or delete it.

2. Information We Collect

Guest mode (no sign‑up): When you first open the App, an anonymous identifier is created so your practice can be saved. It is not linked to your name, email or phone number.
Account information (optional): If you create an account, we store your display name and email address. If you sign in with Google, we receive your name, email and profile photo from your Google account. Passwords are handled by Firebase Authentication and are never visible to us.
Learning data: The exams you take — selected answers, scores, number of correct answers, time spent, start and submission times — and summary statistics such as total points and study streak. Essay answers may be graded by a teacher.
On‑device settings: Your chosen interface language is stored only on your device.

We do not collect location, contacts, photos from your device, camera, microphone, phone number or advertising identifiers.

3. How We Use Information

To let you take exams, score them and review your results.
To keep your history and progress, synced across devices when you sign in.
To allow teachers/administrators to grade essay answers.
To respond to your support requests, such as password resets.

4. Third‑Party Services

Google Firebase (Authentication, Cloud Firestore, Cloud Storage) for sign‑in and data storage. See the Firebase Privacy information.
Google Sign‑In for signing in with a Google account. See the Google Privacy Policy.

The App contains no ads, uses no third‑party analytics or tracking, and we never sell your data.

5. Data Sharing

Your data is visible to you and to Hoppa Math teachers/administrators who grade essays and operate the service. We do not share personal data with anyone else, except where required by law.

6. Data Storage & Security

Data is stored on Google Cloud/Firebase infrastructure.
Data is encrypted in transit (HTTPS/TLS) and at rest.
Database access rules only allow each user to read and write their own data.

7. Data Retention

We keep your data until you delete your account. Deletion is immediate and permanent; system backups, if any, expire automatically on our infrastructure provider's schedule.

8. Deleting Your Account and Data

In the App (recommended):

Open Hoppa Math and sign in to the account you want to delete.
Go to More → Settings.
Scroll to Danger zone and tap Delete account.
Confirm and re‑enter your password (or choose your Google account again).

By email: send a request from your account's email address to [email protected] with the subject "Hoppa Math account deletion request". Guest users can also request deletion this way. We process requests within 30 days.

Deletion removes your profile (name, email, photo), your sign‑in account, and all of your exam attempts, results, scores and statistics. It cannot be undone.

9. Children's Privacy

Hoppa Math is designed for students, including children. Students can use the App in Guest mode without providing any personal information. Creating an account requires the consent of a parent or guardian. We show no ads and do no behavioral tracking. If you are a parent and believe your child has provided information without your consent, contact us and we will delete it.

10. Your Rights

View and edit your display name in More → Settings.
Delete your account and data as described in Section 8.
Request a copy of your data or withdraw consent by contacting us.

11. Changes to This Policy

We may update this Privacy Policy from time to time. Changes will be posted on this page with an updated date.

12. Contact Us

If you have questions or requests about this Privacy Policy, please contact:

[email protected]