Highlights

Classical and narrow V-belts, timing, poly-V and flat belts, roller chain and gear pairs
True tangent-and-wrap belt path with tight and slack side tensions and the shaft load direction
Span natural frequencies with a resonance check against the tooth-meshing frequency
ISO 606 / ANSI B29.1 sprockets and timing pulleys exported as STEP solids
Chain network mode: many chains over many sprockets, with the tension of every span

A question it answers

With 5 kW at 1450 rpm through this V-belt, what installed tension do I need to avoid slip, and what radial load does that put on the bearings?

What you put in

Drive type and standard section, pitch diameters or tooth/sprocket counts, centre distance, transmitted power and input speed, installed tension, friction coefficient, groove angle, pressure angle and helix angle, belt mass per unit length.

What you get

2D schematic drawn from the real belt path with tight and slack sides and the bearing force direction marked, wrap angles, exact belt or chain length (with the excess over the nearest even pitch count reported for chains), tight/slack and effective tension, centrifugal tension, bearing force magnitude and direction, torque and speed, per-span natural frequencies with the running-speed correction applied, a resonance warning, and an animated chain or belt.