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Plan & billing
Your Snowfield plan, renewal state, and order history.
Free
Your plan
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Plans
You can switch plans at any time — an upgrade starts right after the payment is confirmed.
Free
Current plan$0forever
Learn with the full system.
- All published courses, including calculus, linear algebra, Python and more
- 2 courses in progress at a time
- Mastery tracking with spaced review
- Mistake error-loop with capture, retry and variant reviews
- AI study companion (rate-limited)
Paid
$9.99per month
Go deeper.
Beta price. Lock it in now, and it never goes up for you.
- Everything in Free
- 6 courses in progress at a time
- Unlimited AI study companion
- Every future course at your locked-in price
Founding Lifetime
$50one-time
Own the journey.
One-time $50 purchase. Lifetime access, including future releases.
Limited to first 50
- Everything in Paid, forever
- All future courses and the reference library included
- Founding member badge and a direct line to the roadmap
We accept
Secure checkout by Creem (Merchant of Record) — cards, Alipay, Apple Pay and Google Pay. VAT included, instant receipt.
Actions
Payments are processed by Creem (card, Alipay). Once we confirm you are in mainland China, the dedicated CN monthly plan unlocks automatically.
Order history
Every checkout you started, newest first.
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