Simple, fair pricing

Start free. Upgrade when you want every house, more AI help and no ads. Prices in US dollars; local taxes are added at checkout where the law requires.

Free

$0

Everything you need to start learning.

  • Most lessons, quizzes and the daily review
  • Algorithms in C and the code editor
  • Houses 1 to 8 and the terminal course
  • 10 cloud AI answers a day
  • Coins from learning, a daily gift, optional ads
  • Houses 9 to 16
Download free
One plan, everything

Elite

$4.00 / month
  • Everything in Free, with no ads
  • All 16 houses, their exams and the AI exam
  • Real protection steps in every house
  • 200 cloud AI answers a day
  • 200 coins every month
  • The Supporter badge on your profile
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Plans renew automatically until you cancel. Cancel any time from the link in your receipt email; you keep access until the end of the period you paid for.

One-time packs

Fixed contents, always shown before you pay. No random rewards for money.

How buying works

  1. Pay on the secure checkout of Lemon Squeezy, our reseller and merchant of record. We never see your card.
  2. You receive a licence key by email.
  3. In the app, open Store > Have a code? Redeem it, or the code box in Settings, and paste the key. Signed in, your purchase follows your account to a new phone.

Coins are a learning reward inside the app: they have no cash value, cannot be sold or turned back into money, and are never taken for a wrong answer. See the terms and the refund policy.