Yes. The free tier gives you access to all lesson content, the adaptive diagnostic, 15 practice problems per day, and basic progress tracking. No credit card required, no time limit.

Pro unlocks unlimited practice problems, AI-graded short answer questions with detailed feedback, full analytics with topic mastery breakdown, and priority access to new content and features.

We cover the core mathematical olympiad curriculum: Number Theory, Algebra, Geometry, Combinatorics, and Inequalities. This is relevant for IMO, USAMO, BMO, RMO, APMO, and most national olympiads.

The diagnostic is a 10-question test that adapts to your level in real time. It starts with medium difficulty and adjusts up or down based on your performance, so it quickly calibrates your starting point without wasting time on problems that are too easy or too hard.

We use the FSRS algorithm to schedule review problems at optimal intervals. When you answer a problem, the algorithm calculates when you're most likely to forget it and schedules a review just before that point. This means you study less but remember more.

Absolutely. Leminno is fully responsive and works on any modern browser — phone, tablet, or desktop. The math rendering and interactive widgets are optimised for touch screens.

Our AI grading uses Gemini to evaluate short-answer responses against rubrics. Each grade comes with a confidence score — high-confidence grades are shown as definitive, medium-confidence grades include a disclaimer, and low-confidence answers are flagged for manual review. You can always dispute a grade.

Every AI-graded answer has a "Disagree with grade" button. Click it, tell us if the grade was too harsh, too lenient, or outright wrong, and we'll review it. We use dispute data to continuously improve our grading prompts.