- 30 books
- 30,267 exercises
- 5 subjects
- hundreds of links to free resources
An AI tutor that teaches you mathematical thinking
Pick an exercise from an open textbook and work through it with a tutor that asks the next question instead of handing you the answer. Stuck? It nudges you toward the idea you're missing. Done? Your progress is tracked across every book.
Work through exercises with an AI tutor
Pick an exercise from the library and tell the tutor where you are stuck. It won't give you the answer. Instead, it asks questions and gives hints, one small step at a time, so you solve the problem yourself. You can type math formulas right in the chat. The full solution is always one click away when you want to check your work.
Track your progress
Bookmark the exercises you want to come back to, mark the ones you have finished, and rate how hard each one was. Each book shows your progress chapter by chapter, and your dashboard shows what you worked on last, so you can always pick up where you left off.
Learn more from free resources
Books and sections link to free lessons, videos and interactive demonstrations on the same topic. Use them to build intuition before you start on the exercises, or when you need a second explanation. Open to everyone, no account needed.
Start with a book
A few starting points across 5 subjects — all open-licensed, all free.
OpenStax
A first algebra course: linear equations and inequalities, graphing, systems, polynomials and factoring, rational expressions, radicals, and quadratic equations. The exercises train the core skill everything later builds on — translating a problem into an equation and solving it methodically.
Matthew Boelkins
Single-variable calculus built around guided activities: understanding and computing derivatives, their applications, definite integrals, differential equations, and Taylor series. The activity-style problems have you construct each idea before using it — understanding first, procedure second.
OpenStax
Algebra-based physics from mechanics through modern physics: motion, forces, energy, fluids, heat, waves and sound, electricity and magnetism, optics, and atomic and nuclear physics. The problems train the core physics move — model the situation, pick the principle, and carry units through to a checked answer.
OpenStax
Two semesters of general chemistry: atomic structure, stoichiometry, bonding, gases, thermochemistry, solutions, kinetics, equilibrium, acid–base chemistry, thermodynamics, electrochemistry, and nuclear chemistry. The exercises drill the quantitative core of chemistry — moles, reactions, and equilibrium reasoning.
OpenStax
A complete precalculus toolkit: equations and inequalities, polynomial, rational, exponential, and logarithmic functions, trigonometry, systems, analytic geometry, and a first look at limits. These exercises build the function fluency and algebraic stamina calculus demands.
OpenStax
Introductory statistics with a business lens: descriptive statistics, probability, distributions, confidence intervals, hypothesis tests, ANOVA, and regression, applied to finance, marketing, and operations data. The exercises practice turning business data into decisions you can defend.
Free to browse. Premium to learn with a tutor.
The library, solutions and resources are open to everyone without an account. Premium adds the tutor and keeps your progress.