Build Your Engineering Foundation
Knowledge grows like a reef. Each concept is a new layer, each discipline building on those before it. Free practice, interactive lessons, and a community that grows together.
250+
Practice Problems
10+
STEM Courses
100%
Free
Everything you need to learn
Full courses, practice, and simulations for STEM students at every level.
Unlimited Practice
Infinite parameterized questions. Every attempt generates fresh numbers.
Detailed Explanations
UWorld-style walkthroughs explain every answer choice. Learn from mistakes.
Track Your Progress
Earn XP, climb the leaderboard, and track your mastery.
University Course Coverage
Full courses from intro to advanced. Review for class, learn something new, or prep for the FE exam.
Who is reef.science for?
Whether you are prepping for an exam, exploring a new field, or just curious about how the world works.
Built in the open, for the community
A reef grows one layer at a time - each organism building on the work of those before it, until something far greater than any single part emerges. That's how we're building reef.science: an open-source platform where every concept, question, and simulation is a new layer of shared knowledge. Free forever.
Growing Quiz Bank
250+ parameterized questions and counting. Every question is peer-reviewed with detailed explanations.
Interactive Sims
Interactive simulations for forces, moments, beams, and more. Learn by doing, not memorizing.
Community Driven
Join clubs, compete on leaderboards, and help shape the platform with your feedback.
Found a problem or have an idea? Use the feedback button (bottom right on every page) to let us know. We read every submission.