@lmt1 I haven't heard of it, but it seems as if it has the same business model as so many on-line businesses, and that is to sell something and then offer a subscription service for the full capabilities of the device. This goes for the X Plus and for the popular Kardia Mobile devices that I don't believe are wearable, just tactile (you have to place a clean finger on each of two metal pads). You can always sign up for the subscription if you really need to, but in the case of the Kardia many won't need it...just a frequent indication of heart rhythm. So, you should investigate the X Plus to see if its outright purchase will allow you to get out of it what you need without paying for a monthly /annual subscription.