AI cards
Updated on August 5, 2026
EON integrates AI at several points in the study flow to make creating and understanding cards less effort. Every AI feature uses tokens from your plan; the amount available depends on your subscription.
AI can make mistakes. Verify the information before citing it or treating it as final.
Generate the back of a card
When you create or edit a text card and fill in only the Front, a Generate reverse with AI button appears. Press it and the AI writes an answer or explanation based on the question or concept you typed. Similarly, if you only have the Back filled in, Generate front with AI appears to complete the question side.
Review the result before saving: AI can produce plausible but incorrect content, especially on very specific topics.
Explain with AI during review
While reviewing a text card and viewing the answer, the button Explain with AI: why? appears. Pressing it generates an extended explanation that answers "why is it so?", not just what the answer is. The explanation is displayed with the model that generated it and a notice that it may contain errors.
This feature is only available for text cards (not diagram cards) and only when AI is enabled on your account.
Generate cards from a Theca summary
The fastest way to create a full deck with AI is through Theca. The flow is:
- Upload your books or documents to Theca.
- Generate a summary with traceable citations.
- From the summary, press Generate study cards to push it into an EON deck pack.
In EON, the Generate cards with AI button on the main panel opens a modal that explains this process and takes you directly to Theca. The deck is created there and the cards are linked to the original book source, with the option to view the source during review.
AI errors and what to do
If an AI operation fails, a notice appears with the reason and, when applicable, a button to retry or upgrade your plan.
| Notice | Cause | What to do |
|---|---|---|
| You ran out of AI usage | You used all the tokens in your plan | Wait for the next window or upgrade |
| The AI is busy right now | Too many requests at once | Try again in a moment |
| Not available on your plan | The feature requires a paid plan | Upgrade to activate it |
| The AI is unavailable | The service is temporarily down | Try again in a few minutes |
| Too many tasks at once | You already have tasks running | Wait for them to finish and try again |
| The AI could not finish | Error during generation | Try again |
See plans and limits to find out how many tokens your plan includes.
Frequently asked questions
Can I choose which AI model EON uses? Yes. In your account preferences you can select the preferred AI model. Available models depend on your plan.
Is the AI explanation saved to the card? No. The explanation is generated each time you request it during review and does not modify the card content.
What if the AI generates an incorrect back and I save it? You can edit it any time with Edit Card and fix it. No action is irreversible.
Next step
- Theca sources — how to link cards to the book they came from and view the source during review.
- AI box extraction — use AI to automatically detect elements in a diagram image.
- Plans and limits — how much AI quota each plan includes.