An app a day keeps the doctor away

You list your symptoms, answer a few questions about how long they've lasted and whether they seem to be getting worse. Then, without ever leaving home or queueing at the clinic, you get the diagnosis: a strained neck. Or, at least, eight out of 10 people with those symptoms have one. Would you like to have your case reviewed by a human doctor? The free app Ada, which offered up this diagnosis, was launched in the UK in April.