New Simulation Engine: Hyfydy

Hyfydy is a new simulation engine that provides a 50-100x speed gain over OpenSim – using the same muscle and contact models.

Below is a comparison between OpenSim 3, OpenSim 4, and Hyfydy, based on a 60 second gait simulation in SCONE, using [Geyer & Herr 2010] for control, [Millard et al. 2013] for muscle dynamics, and a non-linear Hunt-Crossley contact force model.

More Information

Hyfydy is already being utilized by several academic institutions for biomechanics research. For more information, visit