Simple, one-time pricing
Start free. Unlock everything once. Go ad-free whenever you like.
Free
- 100 hand-picked questions from every category
- Detailed explanation for every answer
- Personal stats, streaks and weak-topic tracking
- Remaining 910 questions
- Ad-free
Full Access
- All 1,010 questions, every topic
- Charts, tables and diagram questions
- All future questions included
- Lifetime access, no subscription
- Ads stay on
Full Access + No Ads
- Everything in Full Access
- No ads, anywhere, forever
- Distraction-free practice mode
- Upgrade from Full Access for $4
- Lifetime access, no subscription
One-time payments in USD, processed by Lemon Squeezy (merchant of record; VAT handled). Try the 100 free questions first: paid plans are non-refundable. Already on Full Access? You only pay the difference to go ad-free.
Questions
Is this a subscription?
No. Every plan is a single payment and stays unlocked for the lifetime of your account.
I bought Full Access. How do I remove ads later?
Upgrade from the pricing page and you only pay the difference ($4).
Which free questions do I get?
A fixed, hand-picked set of 100 questions that covers every category and difficulty, including chart and table questions.
Can I get a refund?
No. Access starts immediately, so all sales are final; that is why the 100 free questions come with full explanations and stats. If you were charged twice or your plan did not unlock, reply to your receipt email and we will fix it or refund it.
Will my progress carry over when I upgrade?
Yes. Your history, stats and saved questions stay exactly where they are.
Who processes the payment?
Lemon Squeezy acts as merchant of record, handles VAT/sales tax and sends your receipt.