Intelligent Reading Companion

Turn any book into a
test of understanding

Calten uses AI to convert any book or PDF into an interactive test, helping you retain more through active recall.

  1. 1Upload a book
  2. 2AI generates questions
  3. 3Test your understanding

Drop your PDF

or click to browse

Supports files up to 500 MB

✓Unlimited usage✓No subscriptions✓No hidden charges

Sign up free to save your tests and track progress across sessions.

Learn how it works →

From your reading to your next revision session

Focus on relevant content

Calten identifies and skips sections such as bibliographies, indexes, reference lists, and author pages when generating questions.

Keep your PDFs in your Library

Create a free account to save uploaded PDFs and return to your reading for another practice session.

Follow your test performance

Revisit past tests and view score trends in your account to help plan what to revise next.

Practise across multiple PDFs

Select several saved PDFs in your account Library and start one test using your chosen readings.

📚—tests completed
❓—questions answered
📖—books in library