The Vaccine Knowledge App is based on the information on the Vaccine Knowledge website developed by the Oxford Vaccine Group in our Department. It contains ‘bite-sized’ sections on every aspect of vaccines and infectious diseases in the UK. It provides clear, relevant and unbiased information in a user-friendly format which can be accessed ‘on the go’. You can also access all our short films, and there is a personalised section where you can enter your child’s date of birth to find out which vaccines they are due. To our knowledge, this is the only app of its type so far developed for a UK audience.