What this tool computes, where it stops, and what it borrows. The localised picture — hybrids, σ and π bonds, lone pairs — is an idealised model rather than a computed wavefunction, and the molecular orbitals are there to show what a calculation gives for the same molecule.
The geometry comes from openchemlib’s MMFF94 or from GFN2-xTB, the molecular orbitals from Extended Hückel theory with published parameters, and the 3D view from Mol*. All of it runs in the browser.
Atomic orbitals, hybridisation and molecular orbitals, computed and drawn in your browser. The tool needs JavaScript and WebGL2; these are the pages it offers: