Support

Effective date: 2026-07-27 · Version: 1.0

Having a problem or a question? The topics below cover the most common ones. If you can’t find your answer, write to the email address at the bottom of this page — we reply within 2 business days at the latest.

Account

I forgot my password

On the sign-in screen, enter your email and request a password reset link. If the email doesn’t arrive, check your spam folder. If you signed up with Google you don’t have a separate Mendum password — sign in with Google again.

I didn’t receive the verification email

Check your spam folder. If it hasn’t arrived after a few minutes, try again with the same address or contact us.

How do I delete my account?

In the app: Profile → Legal → Delete Account. This cannot be undone. For details, and what to do if you can’t access the app, see Account deletion.

Usage allowance and plans

I keep seeing “you’ve used today’s allowance”

The free plan includes 8 AI operations per day; saving one mistake typically consumes 2. The allowance renews daily. Switch to Smartbook to study without a daily limit.

How do I cancel my Smartbook subscription?

On your iPhone: Settings → your Apple Account → Subscriptions → Mendum → Cancel Subscription. After cancelling, features stay active until the end of the period you paid for. Refunds are handled by Apple.

I bought a subscription but the app still shows the free plan

Fully close and reopen the app. If that doesn’t help, tap “Restore Purchases” on the purchase screen. If the problem persists, contact us with your purchase date and Apple receipt number.

Will I be charged automatically when my trial ends?

No. We don’t ask for payment information for the 21-day trial; when it expires your account simply reverts to the free plan.

Scanning questions

My photo couldn’t be analyzed

Try this: shoot on a flat surface in good light, fit the whole question stem and all options into the frame, avoid shadows and glare, and don’t shoot from too far away. Handwritten questions have a lower success rate.

The solution was wrong

Solutions are generated by AI and can be wrong. If you see an incorrect solution, please report it from the feedback screen in the app — telling us the subject and topic is enough.

It was filed under the wrong subject

You can correct the subject and learning objective in the question detail view. If you notice a systematic error, let us know.

Privacy

Where do my photos go?

They are sent to Google’s AI service for analysis and stored in your mistake notebook. Details: Privacy Policy and AI Processing Consent.

I want to withdraw my AI consent

Turn it off via Profile → Legal → AI Processing Consent. Analysis and solution features stop working; your saved data remains.

I want a copy of my data

Write to the email address in the imprint below; we respond within 30 days.

Contact us

From the app: Profile → Feedback. By email: the address in the imprint below.

Including the following helps us help you faster: your device and iOS version, the app version (shown at the bottom of the Profile screen), when and on which screen the problem occurred, and a screenshot if you have one.

Data controller and contact

Requests are answered within 30 days at the latest.