We turn the rigor of a textbook into a gamified guided path: pick from our open library or upload your own PDF, and learn it lesson by lesson with practice and spaced repetition.
Works on phone, tablet, and desktop.
Reading a textbook is passive. We turn it into an active, gamified experience that's hard to put down.
A textbook gives you the kind of understanding you can build on — university-level depth, not the surface-level take of a watered-down course. Drop a PDF and get a structured course with chapters, sections, and roughly 10 minute lessons.
Skimming doesn't stick. Every lesson ends with real practice — multiple choice, fill-in-the-blank, and open-ended challenges. Work the hard ones by hand on paper, snap a photo, and our AI grades your solution with personalized feedback. The deeper you engage, the more you retain.
Spaced repetition powered by FSRS surfaces what you're about to forget, so the things you learn actually stick — without endless re-reading.
From quick recall to full proofs — every lesson tests what you just learned.
Gauss's law states that the electric flux through a closed surface equals the total ______ enclosed divided by ε₀.
A point charge +q sits at the center of a spherical Gaussian surface of radius R. Use Gauss's law to derive the magnitude of the electric field at the surface, and explain why your result is independent of R.
Excellent. You correctly applied symmetry to take E outside the integral, used the surface area 4πR² for the sphere, and noted that R cancels in the final expression…
New books added regularly across math, science, computer science, humanities, and more.
Browse the libraryFrom PDF to your first lesson in minutes.
Drop in any textbook you have rights to use, or jump into one of our pre-built courses.
The system breaks the book into chapters, sections, and bite-sized lessons.
Read the lesson, answer 3–5 practice questions, and earn your way along the chapter path. Open-ended challenges get personalized AI feedback.
Questions you've answered get scheduled for review using spaced repetition — grounded in the spacing effect, one of the most replicated findings in cognitive science. Distributing practice over time produces stronger, more durable retention than cramming or rereading.
Sign in and try TheScholar with our open library, or upload your first textbook.
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