  Shopping is difficult for people with motor impairments. This includes online
shopping. Proprietary software can emulate mouse and keyboard via head
tracking. However, such a solution is not common for smartphones. Unlike
desktop and laptop computers, they are also much easier to carry indoors and
outdoors.To address this, we implement and open source button that is sensitive
to head movements tracked from the front camera of iPhone X. This allows
developers to integrate in eCommerce applications easily without requiring
specialized knowledge. Other applications include gaming and use in hands-free
situations such as during cooking, auto-repair. We built a sample online
shopping application that allows users to easily browse between items from
various categories and take relevant action just by head movements. We present
results of user studies on this sample application and also include sensitivity
studies based on two independent tests performed at 3 different distances to
the screen.
