It was designed and produced by Skyjam Paragliders of Einsiedeln, but the company appears to be out of business as of 2013 and production is assumed to be complete.
In its ultralight trike configuration the ST-Freestyle features a cable-braced hang glider-style high-wing covered in Dacron sailcloth, supported by a single tube-type kingpost with weight-shift controls utilizing an "A" frame weight-shift control bar.
The engine package can also be removed from the wheeled fuselage frame and the aircraft then foot-launched as a powered paraglider using the same wing.
The ST-Freestyle has tricycle landing gear and a single electric motor in pusher configuration.
The powerplant is a ST Elektro ST100 or ST200 electric motor driving a shrouded three-bladed composite propeller.