Free to practise. $5 a month for the voice.
Every problem, hint, explanation and lesson is free. A subscription adds the recorded voice: the Solution tab read aloud, and a narrated walkthrough video of every problem.
The subscription
$5 a month, in US dollars (USD), charged every month until you cancel. The price is final: nothing is added at checkout. Your bank may convert it to your own currency.
What a subscription includes
- Read aloud: the explanation on each problem's Solution tab, read in a recorded voice, starting from any heading.
- Animated walkthroughs: a narrated video of the solution for all 150 problems, with the drawing of the data and the code moving together and captions you can switch on.
- A shorter walkthrough video for each of the 12 AI Engineering lessons.
Free for everyone
- All 150 problems in JavaScript, TypeScript or Python, with tests that run in your browser.
- Hints, explanations and reference solutions.
- The Patterns, Machine Learning, AI Engineering and Interview Prep lessons.
- Reviews, the notebook, and an account that keeps your progress.
Subscribing and cancelling
Create an account and confirm your email, then press Subscribe in the Account dialog. You pay on the secure page of Flitt, our payment provider, with a Visa or Mastercard card, Apple Pay or Google Pay. Access starts as soon as the payment goes through, and an email confirms it.
Cancel at any time from the same dialog. The subscription then stops renewing, and you keep access until the end of the month you paid for. Payments are not refunded: see the refund policy.
Questions
Write to [email protected]. The terms of service and the privacy policy cover the rest.