Interactive problem solving that’s effective and fun. Master concepts in statistics, probability, data structures, and beyond.
Data
Math
CS
Science
Over 100,000 5-star app reviews
Visual, interactive learning makes even complex concepts feel intuitive and approachable.
From foundational statistics to advanced data structures, we start you at the right level and help you make progress, one step at a time.
Build your intuition through “aha” moments, not memorizing answers.
We personalize your experience by providing instant, custom feedback as you solve problems and recommending next steps.
Keep on track with engaging lessons, competitive features, and daily encouragement.
All of our courses are crafted by award-winning teachers and professionals from top institutions.
Exploring Data Visually
Introduction to Probability
Predicting with Probability
Regression
Clustering & Classification