Currently, Babylon’s 150,000 registered users book doctor’s appointments and routine tests through the online service, and they can consult with one of about 100 doctors 12 hours a day, six days a week, for a cost of £7.99 ($11.40) per month. The new app, by contrast, is expected to cost £4.99 ($7.10) per month. As well as offering patients advice on sick care, it will be able to constantly monitor information on the kidneys, liver, bones, cholesterol levels, and more, along with data collected from wearable devices that monitor sleep patterns and heart rate. It issues alerts about any areas that are “red” or “amber,” in traffic-light terms, and formulates personalized health plans to keep patients in the “green,” where they are at peak health.