Richard Neal, MB, ChB, PhD, FRCGP, from the Leeds Institute of Health Sciences, Leeds, UK, discusses symptom checker apps at the European Cancer Congress of the European Cancer Organisation (ECCO) 2017 in Amsterdam, Netherlands. There are a range of symptom checker apps that are available, however not all of them are credible or well evaluated. It is important to be cautious when using these apps and basing decisions on information from them, as it may not always be accurate.