Aha! Math  ·  Last updated: August 30, 2026

This policy explains what happens to information when a child uses Aha! Math (the “App”), published by ARC EDU CO.,LTD. Because the App is made for children, we have tried to state plainly what stays on the device and what does not.

The short version. A child’s account, answers, scores and progress are kept in the App’s own storage on their device. We do not run a server that stores any of it, and we never receive a copy.

Two things do leave the device, and neither carries a child’s answers or scores:

  1. Professor Aha — only if a child chooses to use it. The question is sent to our server and on to Google’s Gemini AI (Section 2).
  2. Subscription status — checked with the app store and RevenueCat (Section 3).

The App’s typefaces are built into the App itself, so it does not contact a font service.

1. What we collect, and where it is kept

We do not collect personally identifiable information — such as a name, address, or phone number — without your knowledge, and we do not operate a server that stores children’s accounts or learning records.

The account created in the App (a display name, an email address, and the password stored only as a scrambled value from which the password itself cannot be read back) and all learning records — answers, scores, progress, and the marking a child draws on a problem — are saved in the App’s own storage on that device. They are never sent to us.

One thing is worth knowing about that storage. On Android, the phone’s own system backup may copy the App’s storage to the child’s Google Drive and restore it when the App is reinstalled or a new phone is set up. That backup belongs to the Google account, not to us; we cannot read it and we never receive a copy. You can turn this off in the device’s backup settings.

You can delete an account and its learning records from inside the App at any time. See Delete your account for the steps.

2. Professor Aha (optional AI help)

The App includes an optional feature called Professor Aha. It is not needed to use the App. When a child taps “Ask Professor Aha” and sends a question, that question travels to our server and then to Google’s Gemini AI, which writes the reply. This is the only feature in the App that sends anything a child types off the device.

What our server receives

  • The text of the question the child typed, or the ready-made question they tapped
  • Which problem it was asked about, and which screen it was asked from
  • A random number the App makes up on the device the first time Professor Aha is used. It is not tied to the account, to the phone, or to anything Google or an advertiser can recognise. Our server keeps it, with the date, purely as a counter for the five-questions- a-day limit, and that counter is deleted automatically after 48 hours.
  • As with any request over the internet, the device’s IP address. We do not store it and do not use it to work out where a child is.

What is passed on to Google

  • The question itself, the text of the problem, and the wording our own app uses to teach that problem
  • Not the random counting number, and not the IP address our server saw

What is never sent at all

  • The name, email address, or password from the account
  • Scores, answers, or study history
  • Any advertising identifier, and no identifier issued by the phone or the operating system (such as an advertising ID, IMEI, MAC address, or Android ID)
  • Any location a child has entered

We check every question before it leaves the device

Before a question is sent, the App inspects it. If it appears to contain an email address, a web link, a phone number, a postal code, an address, a social media handle, a long string of digits, or a sentence in which the child begins describing themselves (for example “my name is…”, “I live in…”, “I go to school at…”), the question is refused and never sent. The child is shown a short message asking them to write about the numbers in the problem instead. The same check runs again on our server, before anything reaches Google, so that a modified copy of the App cannot get past it.

The panel says, on the same screen, that the question goes to an AI and that personal details must not be written. Ready-made questions are offered first, so that most children never need to type at all.

How questions are used, and for how long

A question is used only to produce that one reply. We do not use questions to build a profile of a child, to advertise, or to train any AI model. Google processes the question in order to generate the reply. We use the paid Gemini API, under which Google does not use prompts or responses to improve or train its products, and keeps a short-lived log only to detect misuse and to meet legal obligations.

If someone taps “Report this answer”, that report — the question, the reply, the problem and screen it came from, why it was reported, and the time it was sent — is kept for up to 90 days so that we can find and fix poor replies, and is then deleted automatically.

3. Subscriptions

Subscriptions are sold and billed by the store the App was downloaded from, and their status is managed for us by RevenueCat, Inc. We never see or store card numbers or billing addresses.

RevenueCat receives an anonymous identifier that it generates itself, the purchase record issued by the store, and basic technical details of the device — its type, its operating system version, and the IP address the request came from, which RevenueCat uses to work out the country and then discards. It does not receive a name, an email address, or any learning data.

Deleting an account inside the App does not cancel a subscription. A subscription is tied to the store account that bought it and must be cancelled in that store.

4. Children’s privacy

Aha! Math is made for children of roughly 8 to 12. The App does not ask a child’s age or date of birth, and it collects nothing that identifies a child. We show no advertising, and we use no advertising networks, no crash-reporting services, and no analytics or tracking that follows a child’s use of the App.

Before an account can be deleted, the App asks a short arithmetic question so that a grown-up is present. On iPhone and iPad the same check is shown before a purchase can be started; on Android, purchases are protected by Google Play’s own parental controls and purchase authentication settings.

We do not knowingly collect personal information from a child. If you believe a child has sent personal information through Professor Aha despite the checks described in Section 2, please write to us at the address below and we will search the stored reports and delete any that match.

5. Other services the App uses

Apart from the cases named above, we do not provide information to third parties, except where required by law or where necessary to protect a person’s life, body, or property. The complete list of outside services is:

  • Google (Gemini API) — writes Professor Aha’s replies (Section 2).
  • Cloudflare — operates the server that carries Professor Aha’s questions. As the operator of that server, Cloudflare handles the request, including the device’s IP address.
  • Google Play and RevenueCat, Inc. — sell subscriptions and report whether one is active (Section 3).

6. Where information is handled

ARC EDU CO.,LTD. is a Japanese company. The outside services listed in Section 5 operate outside Japan, mainly in the United States, so the small amount of information described in Sections 2, 3 and 5 is processed there.

7. Changes to this policy

We may update this policy as the App changes. An updated policy takes effect when it is posted on this page or shown within the App. When a change affects what leaves the device, we will say so plainly rather than only changing the date.

8. Contact

ARC EDU CO.,LTD.
GRANDUE 101, 3-17-6 Miyakojima-Nakadori, Miyakojima-ku, Osaka 534-0022, Japan
Email: arc-matsumoto@arc-edu.comAha! Math is published by ARC EDU CO.,LTD.  ·  This policy covers the Aha! Math mobile application only.