HomePricing
One purchase. Every lesson. Forever.
Two lessons free to see how the interactive walkthroughs work. Upgrade once, keep everything we ship next.
FreeNo card
$0
A real taste of how the lessons feel — the first two are open access.
- System Design Overview
- URL Shortener
- Progress saves once you sign in
Recommended
Full AccessLifetime
$10one-time
Pay once, every current and future lesson is yours. No subscription, no upsells.
- All lessons (current + future)
- Interactive 3D walkthroughs + 2D whiteboard mode
- Keyboard navigation & saved progress
- Lifetime access — no subscription
Upgrade on dashboard
By upgrading you agree to our Terms, Privacy Policy, and Refund Policy.
FAQ
The short version
Is this a subscription?
No — it's a one-time purchase for full access.
Do I need to install anything?
No. Lessons run in the browser.
What if I'm not satisfied?
All sales are final — see the Refund Policy linked below.