Each tool is a single self-contained page: explanations, live diagrams you can drag and slide, worked examples, practice problems with staged hints, and checkpoint quizzes. Progress saves in your browser.
Nothing to install and no account needed — open one and start. Best on a laptop, but everything works on a phone.
The differentiation, integration, and series skills a differential equations course assumes on day one — 24 interactive labs, and every problem worked step by step.
Open the toolkit →From "what even is an ODE" to Laplace transforms and systems with eigenvalues — fifteen lessons designed to make day one of the real course feel like review. Plus a Math 275 companion covering Prof. Williams' §1.1–§2.4, with every classwork problem worked step by step.
Open the launchpad →Partial differential equations end to end — classification, characteristics and shocks, Fourier series, separation of variables, the heat/wave/Laplace equations, Sturm–Liouville theory, transforms, Bessel functions, and numerical stability.
Open the launchpad →Vectors and span, matrices as transformations, elimination, determinants, the four fundamental subspaces, orthogonality and least squares, eigenvalues, diagonalization, the SVD, and applications to Markov chains and systems of ODEs.
Open the launchpad →The same subject as a paced reading course: 24 short lessons plus a reference sheet, worked step by step, with a checkpoint quiz at the end of every week.
Open the course →DC circuit analysis worked the way it is actually assigned — charge and current, voltage and power, circuit elements, Ohm's law, Kirchhoff's laws, series/parallel reduction, wye–delta, nodal analysis with supernodes, and BJT DC bias. Drag a slider and the schematic re-solves itself, from a single resistor up to a full two-node circuit.
Open the lab →Crystal structures, phase diagrams, diffusion, mechanical behavior and more, with rotatable lattices, an interactive periodic table, and diagram analysis.
Open the review →