Simple, Fair Pricing
Boolean Logic & Lambda Calculus are free forever. Subscribe to unlock all subjects.
Monthly
$10 /month
Full access to all topics and future content.
- ✓ All topics unlocked
- ✓ New topics as they're released
- ✓ Full progress tracking
- ✓ Cancel anytime
Yearly
$100 /year
Best value—two months free.
- ✓ All topics unlocked
- ✓ New topics as they're released
- ✓ Full progress tracking
- ✓ $20 annual savings
- ✓ Cancel anytime
What's Free?
Boolean Logic and Lambda Calculus are completely free—over 700 cards covering the foundations of logic and computation. No time limit, no credit card required. Enough to build the daily habit and see how the scheduling works.
You also get the first topic of every other subject to sample the content before subscribing. Your progress carries over when you do.
Questions
Can I cancel anytime?
Yes. Cancel from your account settings at any time. You'll keep access until the end of your current billing period. No questions asked.
What payment methods do you accept?
We accept all major credit cards (Visa, Mastercard, American Express) through Stripe.
Is there a refund policy?
If you're not satisfied within the first 30 days of your subscription, contact us for a full refund.
What happens to my progress if I cancel?
Your progress is preserved. If you resubscribe later, you'll pick up right where you left off. You can also continue reviewing the free introductory topics.
Want the Full Curriculum?
Start with the free introductory topic—no account required.
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