Brilliant is an interactive learning platform focused on mathematics and computer science, designed for students, professionals, and lifelong learners. The platform delivers bite-sized, visual lessons built around active problem solving rather than passive video instruction. Instant, custom feedback is provided after each interaction, helping learners correct misconceptions in real time and build genuine understanding.

The platform offers over 40 expert-designed courses spanning arithmetic, algebra, calculus, probability, data analysis, programming, and foundational computer science. Each course is crafted by award-winning teachers and professionals from institutions such as Caltech, MIT, Duke, Microsoft, and Google. Courses are structured into guided learning paths that adapt to individual pace and prior knowledge, allowing learners to jump ahead or review as needed.

Brilliant uses a gamification layer to sustain motivation, including streaks, leagues, XP, and leveling systems that reward consistent practice. Personalized practice sets are generated based on mastered concepts and learning history, incorporating spaced repetition and mixed-problem strategies to reinforce long-term retention.

The platform is available on desktop web, mobile web, iOS, and Android, enabling seamless learning across devices. A free tier allows daily access to lessons with a two-lesson limit, while Premium unlocks unlimited access to all courses with no ads or daily restrictions. Brilliant for Educators extends Premium access to qualifying K-12 teachers and their students at no cost, and group plans support families and teams of up to 50 members.