Brilliant

Brilliant is an interactive learning platform that transforms how people master math, science, and computer science. Instead of passive videos or textbooks, it uses hands-on problem-solving with instant feedback. The platform now features Koji, an AI tutor that adapts to each learner's knowledge state, asking guiding questions and generating visual, interactive problems on the fly. Koji tracks mastery, identifies misconceptions, and builds targeted practice to fill gaps. Brilliant is designed for a wide range of learners: students from 5th grade through college, homeschoolers, and lifelong learners seeking to sharpen their STEM skills. The curriculum covers arithmetic, algebra, calculus, probability, statistics, computer science fundamentals, Python programming, neural networks, and data analysis. The platform also offers accredited supplementary education programs. What sets Brilliant apart is its pedagogical approach: every session is visual and interactive, encouraging learners to build intuition by manipulating concepts. The AI tutor, Koji, combines techniques from intelligent tutoring systems, recommender systems, and natural language conversations to pinpoint where a user is stuck and provide tailored help. The goal is to foster independence—Koji gradually fades support as the learner gains confidence. Brilliant is available on web and mobile, with streak-based gamification to maintain motivation. It has over 10 million learners and 100,000+ five-star app store reviews. The platform is built by experts from MIT, Harvard, and other top institutions, and continuously improves through millions of daily problem attempts and A/B testing.