Find answers to common questions below, or reach out directly.
Frequently Asked Questions
The Sharpness Score is a daily metric that compares your current mental math speed and accuracy against your personal historical baseline. It tells you how sharp you are today compared to your own recent performance — not anyone else's. Learn more →
No. MentalMather works without any sign-up, email, or personal information. Your data is stored locally on your device using an anonymous identifier.
You can send an asynchronous challenge to anyone by sharing a link or QR code. Both players solve the same set of problems under the same conditions. Results are compared based on speed and accuracy. No account is needed on either side.
Your game performance data is stored locally on your device. If you uninstall the app, this data will be lost. Challenge results stored on our server will remain.
Premium subscriptions are managed through your device's app store. On iOS: Settings → Apple ID → Subscriptions. On Android: Google Play → Subscriptions. You can cancel anytime and keep access through the end of your billing period.
To delete local data, uninstall the app or clear its data through your device settings. To delete server-side data (challenges, analytics), email us at [email protected] with your request.
Ads appear only between screens — never during gameplay, never while solving problems, and never while viewing your results. Your focus time is always uninterrupted. Premium subscribers see no ads at all.
Still need help?
Reach out and we'll get back to you as soon as possible.