Think Math Support

Last updated: September 22, 2026

Thank you for using Think Math. If you have a question or run into a problem while using the app, please reach out using the information below. We'll help you as quickly as we can.

How to contact us

Email: hasegi.cs@gmail.com

Response time: within 1-3 business days

Developer: Hasegi Inc.

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To help us resolve your issue quickly, please include as much of the following as you can:

Frequently asked questions

Q. Do I need to sign up or log in?
A. No. Every feature of Think Math works right away, with no account and no login.
Q. Where is my study data stored?
A. All of your study data (wrong-answer notes, handwriting, attached photos and so on) is stored only on your device. It is never sent to an external server.
Q. Will my data move to a new device?
A. Because your data lives only on your device, automatic transfer is not supported. On a new device, please start fresh.
Q. What happens to my data if I delete the app?
A. Deleting the app deletes all study data stored on the device, and it cannot be recovered.
Q. Can I turn off ads?
A. Yes. Think Math Pro is a one-time purchase that removes all ads and unlocks every card at once. If you have already purchased it, tap "Already bought it? Restore" on the Pro screen to get it back on a new device or after reinstalling (same Apple ID or Google account).
Q. Can I use the app in English or Korean?
A. Yes. The app follows your device language. You can switch at any time with the language button at the top of the home screen.
Q. I'm not getting notifications.
A. Please check that notifications are allowed for Think Math in your device Settings, under Notifications. Also check whether Low Power Mode or Do Not Disturb is on.

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