About FrameCalc
FrameCalc is a browser toolkit for special-relativity kinematics, teaching simulations, and standard fusion formulas — with plots and LaTeX copy.
Free vs Pro
Calculators, simulations, and fusion formulas stay free, including copy-as-LaTeX. Pro adds PDF export, named workspace, parameter sweeps, dataset-fit export, MATLAB / Wolfram / NumPy snippets, a course-pack JSON file, and a local history notebook.
Limits
Some tools are textbook closed forms; others are teaching simulations or labeled estimates. See Accuracy for grades (closed-form, SI, numerical, estimate).