Unless you're rich, run a hospital or have medical professionals in the family, it's not likely that you have instant access to a doctor whenever you need. That's why HealthTap is joining the growing field of telemedicine apps that, for a monthly fee, will let you video chat with specialists as and when you require. HealthTap Prime will cost you $100 per month for the first person, with each additional person in the family requiring a $10 monthly surcharge. There doesn't appear to be any limits on how many times you can contact a doctor with the service, but if you didn't stop calling to ask if something looked infected, then expect to land on some sort of blacklist.