Sale has ended but you can still get this app.
Download AllergyMe: Allergy Medical ID Now

Official Description

AllergyMe is the first medical identification app that is specifically designed & developed for allergy sufferers, by an allergy sufferer.

This app has featured on BBC News, BBC Radio and in the Anaphylaxis Campaign!

AllergyMe has a customisable emergency alarm which alerts nearby people to your location and displays an emergency message along with all of your personal details and what people can do to help you in the event of an allergic reaction.

With this information, you can choose to create a lock screen wallpaper which can be accessed even if your phone is locked, meaning if you were to have an allergic reaction, those who need to see it can possibly save your life.