In 2003 I wrote Magnetism 3D, a Delphi desktop app for visualizing magnetic fields. It's been used in US physics classrooms ever since — but it needs a Windows install, which is a dealbreaker in a Chromebook world. So I rebuilt it from scratch in TypeScript + WebGL. It now runs in any browser — no install, no login, free. You build scenes from primitives (wires, loops, solenoids, toroids, bar magnets, charged particles) and watch the field update live: heatmap, iron filings, Linear Integral Convolution, field vectors, 3D field lines. There's an Ampère's-law widget for closed-path integrals and 2D/3D Lorentz-force trajectories for cyclotron and mass-spec setups. Every scene is deep-linkable and embeds in Canvas/Notion/any LMS with a one-line iframe. Would love feedback from teachers and physics folks especially — what would make this genuinely useful in your class?

Magnetism 3D Lab

Interactive Electromagnetic Field Lab for Physics Classrooms

Interactive Electromagnetic Field Lab for Physics Classrooms