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- All 534 practice problems across every topic and difficulty
- The full proof trainer: fill-the-gap, reorder, and choose-method
- The mistakes notebook, which queues every problem you miss for re-drilling
- Advanced per-topic progress - everything works offline in your browser
Weekly, yearly and lifetime plans are available - current prices load below.
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Subscriptions renew automatically and can be cancelled anytime from the link in your receipt email. Access is tied to this browser; keep your receipt email for account recovery. Already subscribed elsewhere? Restore access.
What stays free?
Every topic and subtopic, all 54 formula references, all six calculators (truth tables, sets, GCD/LCM, base conversion, combinatorics, modular arithmetic), the basic progress dashboard, 20 practice problems drawn from all 7 topics and every difficulty, and one exercise in each proof mode are free forever - no account needed.
How is my access stored?
Purchases are handled by RevenueCat and Stripe. An anonymous purchase id is kept in this browser so Discretica recognises your Premium access on this device. Keep your receipt email for recovery.
I already subscribed on another browser or device - how do I get Premium here?
Head to Restore access and paste the access code shown on this Premium page (or from your receipt). Premium moves to this browser instantly.
Can I cancel?
Yes. Subscriptions renew automatically and can be cancelled anytime from the link in your receipt email. Lifetime is a one-time payment.
How do I get help with a purchase?
Email [email protected] from the address you paid with, and include the date of the charge. Billing and access questions are handled there.
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