Hard to trick:

BioID can't be fooled by

photos or recordings.

A woman's face with the face outlined, indicating that it has been detected. In the back some digital identities, shown as silhouettes of people with logos of eg social and business networks.

Liveness detection

Can’t an impostor simply present a fake trait, like a picture of a valid user?

BioID uses a number of patented techniques, such as looking for blinking and other non-intentional movement, to detect impostors and make sure that the traits are presented by a real person.