01 · CIRCLE & UNDERSTAND
Something unclear?
Circle it.
A formula from a lecture, a term from class: circle it with the AI pen. The explanation is attached as a card right there – and stays there.
Download free
How it works
- Circle
Choose the AI pen and circle the unclear passage with Apple Pencil.
- Read the explanation
The answer appears beside your notes – with the context it needs.
- Find it again
Passage, connection and card are saved with your notebook – ready when you review.
TRY IT
Circle the formula.
Here with prepared answers – in the app with your own material.
Try the AI penInteractive example
AI pen activeThe derivative
Why does this become 2x?
The slope at every point.
The derivative of x² is 2x. Substitute a value for x to get the slope of the curve at that point.
Or tap it.
Interactive example with prepared answers. Nothing you enter is sent anywhere.
Good to know
Otriva Plus gives you 500 a month for $3.99 in the US, shared across the devices on your subscription.
AI stays off until you consent. Writing, organizing and PDFs work without it.
In a topic, you can ask a question about your notes – no circling needed.
Frequently asked questions
What is sent to the AI?
After your consent, the selected passage and the context it needs – to the AI services named in the privacy policy (German).
Can the explanation be wrong?
Yes. AI answers can contain mistakes. Check them against your course materials.
Do I need internet access?
Yes, AI explanations need an internet connection.
Is the demo on this page real AI?
No. The demo shows the idea with prepared answers; your input is not sent anywhere.