Pricing
Free covers the foundations. Paid covers the rest of the path.
Same engine on both sides. Pro adds the other 62 concepts — pay monthly, or save with the 6-month pass.
Free
$0
forever
Enough to feel the system on real material before you pay for anything.
- The first 4 concepts (the foundations of SQL)
- The full mastery engine on those 4
- Maxx, the in-product AI grader, on every wrong query
- No card. No expiry.
Pro · Monthly
$12
/mo
The full path, billed monthly. Cancel in two clicks.
- All 66 concepts, in order
- The full mastery engine across all 66
- Spaced review that defends what you locked in
- Harder concepts you nail strengthen the easier ones underneath
- Maxx, the in-product AI grader, on every wrong query
Pro · 6-month pass
$48
/6 months
$8/mo — 2 months free vs $12/mo $72
One payment. Does not auto-renew.
- Everything in Pro, for 6 months
- 2 months free vs paying $12/mo for 6 months
- One payment — no subscription, no auto-renew
- Works out to $8/mo
What people ask before paying
What does Free actually include?
The first 4 foundational concepts and the full mastery engine on those concepts. Yours forever, no card. The point is you can feel how the system works on real material before you decide.
What's the 6-month pass?
One payment of $48 for 6 months of full Pro access — the same 66 concepts and engine as monthly. At $12/mo, 6 months would be $72, so the pass saves you 2 months — $8 a month. It does not auto-renew: when the 6 months are up you return to the free tier and can renew or switch to monthly.
Can I cancel anytime?
The monthly plan, yes — cancel from your account in two clicks, and you keep Pro through the end of the period. The pass is a one-time payment, so there is nothing to cancel; it simply ends after 6 months.
What about refunds?
Paid time is non-refundable. The free tier is the trial. You can use the engine on the first four concepts before paying, so by the time you upgrade you already know whether the system fits how you learn. Edge cases get reviewed on request.
Which SQL does this teach?
PostgreSQL, the dialect most analyst jobs hire against. Queries run against a real Postgres engine embedded in your browser. Nothing to install, nothing stored on a server.
I have never written SQL. Is this still for me?
Yes. Every concept ships with a lecture written for someone who has never touched a query. The system places you at the start and adapts as you go.