The problem is, a lot of guys feel awkward about going to a clinic and "providing a sample" on-site. That's where Medical Electronic Systems' YO system comes in. It lets users check their motility at home (or wherever else they feel inclined to do so) using their iPhone or Galaxy smartphone.
First of all, there are indeed other male fertility tests already on the market.
According to Medical Electronic Systems, however, these typically just measure the concentration of sperm in a semen sample. If all those sperm are poor swimmers, they're not going to do much good. YO goes a step farther, by indicating what percentage of them are actually moving, and doing so in a correct manner.