Brilliant

Brilliant (Brilliant Worldwide, Inc., brilliant.org) operates an interactive learning platform focused on math and coding, plus science and data analysis, aimed at learners from roughly grade 5 through college and beyond. Its core product pairs short, visual, interactive lessons with an AI tutor named Koji, which can see what is on the learner's screen, models what the learner does and does not know, asks guiding questions rather than supplying answers, and adapts pacing and practice to identified gaps. Course catalogs span arithmetic thinking, proportional reasoning, probability, visual algebra, equations, quadratics and calculus in math; thinking in code, variables, Python, functions, algorithmic thinking, computer science fundamentals and neural networks in computer science; scientific thinking, circuits, digital circuits and quantum computing in science; and data visualization, probability in data, clustering and classification, regression and prediction in data analysis.

The company describes its pedagogy as combining intelligent tutoring systems, machine-learning recommender techniques and natural-language conversation for user knowledge modeling, together with on-the-fly generation of visuals and interactives built on a content library developed over several years. Every lesson has associated practice sets designed as low-stakes quizzes with scaffolding removed, and personalized practice selection predicts the next problem needed to prepare a learner for a later question; spaced repetition, interleaved practice, automaticity measurement and set length and difficulty are described as areas of active experimentation. Review sets combining problems from prior lessons are being rolled out course by course with human review. A gamification layer including streaks, leagues, levels and XP is used for habit formation, deliberately limited so as not to displace learning content.

Brilliant states it is fully accredited by the Accrediting Commission for Schools, Western Association of Schools and Colleges, and is a member of the kidSAFE Seal Program. It says curriculum is built by award-winning teachers, subject-matter experts and learning designers from institutions including MIT, Harvard, Stanford, Cornell and Caltech. Sue Khim is co-founder and CEO.

Founding story

Sue Khim, originally from South Korea and raised in Chicago, left the University of Chicago after three years of studying mathematics to co-found Alltuition, an edtech startup that simplified the financial aid and low-cost college loan process; she co-founded it with two others and raised a seed round. After receiving venture funding, the team decided to work on broader education for students, and the Alltuition team became Brilliant in October 2012. Khim was named to Forbes' 30 Under 30 in education in 2012.

Business model

Brilliant sells access to its learning platform directly to consumers, with pricing and gift subscriptions offered on its website, and also markets solutions for educators and homeschools. It positions the tutor as an accessible-price alternative to hiring a human tutor.

Consumer subscription access to courses and the Koji tutor, sold through the company's site (including gift purchases), alongside offerings aimed at educators and homeschools.

Traction

The company reports more than 10 million learners around the world and over 100,000 five-star app store reviews, and describes millions of problem attempts each day. Earlier reporting described Brilliant as an online community of over 4 million users.

Latest developments

Brilliant markets Koji, an AI tutor that tracks mastery, adapts practice and provides step-by-step visual guidance. The company says it is rolling out cross-lesson review sets course by course and, after completing Algebra coverage, plans to expand into Geometry, Probability, Calculus and further topics in 2026.