We've been testing MotionBend on MacOS X 10.11 El Capitan. We didn't expect any problems because we knew we weren't using any system components that changed with 10.11.
As always, seeing is believing, so here's a screenshot of MotionBend on El Capitan:
If we do find any issues we will issue an update as soon as possible. There are several smaller improvements already in testing for the next version and some larger changes in development. Depending on how things go, the next version may get bumped up to 1.5.