Built for the design engineer.

Live force-deflection plot, Goodman fatigue diagram, real-time manufacturability checks.

Select one or two specification changes and read the directional impact across nine performance and geometry outputs, with the reasoning behind each result.

Convert the units engineers use to design and specify springs — rate, stress, torque, force and more — and see the exact factor behind every result. Free to use, metric and imperial, no sign-in.