Highlights

Single gears, gear pairs, planetary sets, straight bevel sets and multi-stage assemblies
STL and STEP export, with contact-ratio and interference/undercut checks
Tooth FEA: single tooth under flank load, or torque-driven contact of two mating teeth
Stepped shafts with per-section torsional stress, and a model tree that re-aligns the assembly
Send a gear pair to the simulation canvas as a gear-mesh block; save projects locally or in the cloud

A question it answers

Will this 3-module, 20-tooth pinion's tooth root survive 180 N·m, and how does the computed root stress compare with the Lewis estimate?

What you put in

Module, tooth count, pressure angle, profile shift, helix angle, face width, bore, centre distance or ratio; for bevel, shaft angle and tooth system; a section table for each shaft; material properties and the applied torque for the analysis.

What you get

3D preview and hierarchical model tree, STL and STEP files, contact-ratio and interference/undercut checks, root bending stress field with mesh-quality figures, solver convergence history, per-section shaft torsional stress, an alignment re-build report that states what it did NOT change as prominently as what it did, and a gear-mesh component for the simulation canvas.