Children’s Privacy (COPPA Notice)

Last updated: October 12, 2026

1) Is the App directed to children under 13?

The App is an educational practice tool intended for a general audience and may be used by students. We do not intentionally target children under 13 with advertising or marketing.

2) What information might be collected?

The App may collect and store:

• Practice/progress data

  Performance on multiplication practice (e.g., correct/incorrect counts, response times, and spaced-repetition scheduling data).

• Account identifiers

  An anonymous identifier; a sign-in identifier if a parent/guardian chooses to sign in via Google, Apple, or email link; or, for a school-authorized learner session (see Section 4), an opaque per-session resume secret and the learner's display name stored on the device.

• Technical data

  Basic device/browser and interaction information collected by our service providers (e.g., Firebase) for security, reliability, and product improvement.

• Public game leaderboard entries

  If a player chooses to post a time on a free public game's leaderboard, we store and publicly display the nickname they typed, the state or country they optionally picked from a list, the game time, and the date. Posting is optional and needs no account. The game asks for a nickname only, never a real name, a town or city, an email address, a phone number, or a school, and it rejects nicknames that look like contact information. A parent/guardian may ask us to remove an entry (see Section 3).

We do not require a child to provide more information than is reasonably necessary to use the App.

3) Parental choices and control

A parent/guardian may request to:

• Review or delete information

  Request access to, deletion of, or restriction on further collection/use of a child’s information.

• Stop account use

  Ask us to disable a child’s account or remove stored progress.

To make a request, contact us using the in-app Feedback button or email support@mathbuilders.com We may need to verify you are the parent/guardian or account holder before fulfilling a request.

4) School-authorized learner sessions at home

A teacher can give a student a home code so the student can practice on a home device without a parent account. Redeeming the code creates a school-authorized learner session: the device stores an opaque per-session resume secret and the learner's display name so the App can recognize that device on return visits. The secret does not by itself reveal the learner's identity; it only resumes the session it was issued for, and it has no authority once a parent or the school ends it. A parent or the school can end a school-authorized learner session at any time by removing that device from the child's home access, which immediately stops it from resuming practice. Issuing a new home code does not by itself end an existing device's access; removing the device is what ends it.

5) Our COPPA responsibility and school authorization

We are the operator and are responsible for complying with COPPA for the personal information we collect from children under 13. When a school directs the App's use for its students (for example, by issuing class codes or home codes), we rely on the school's authorization as the basis for collecting that information for the limited educational purpose the school directed, consistent with FTC guidance on school-authorized educational technology. This does not shift our own COPPA obligations onto the school. Please see our FERPA notice for additional information for educational institutions.