TraceFace measures the ability to recognize faces and tracks this ability over time. The app could also be used to train this ability and select most effective techniques to improve it. Apart from measuring the ability to recognize faces, the app can also be used to assess recognizability and dominance of faces.

The ability to recognize faces varies widely among individuals. On one end of the continuum are 'super-recognizers' who can accurately identify faces even when they have only seen them briefly. On the other end are people with a 'face blindness'. Assessing the ability to recognize faces could be important for various reasons, from attempting to know more about oneself, to informing the selection process of security personnel or determining the trustworthiness of eyewitnesses.

Face recognizability and dominance could be a factor in such fields as acting where the recognizability and dominance could be beneficial, to working as security operatives where high recognizability could be a disadvantage.

TraceFace uses the original technique to assess the recognizability and dominance of faces. Specifically, the recognizability of a face is measured by the ratio of times it was recognized in various groups of faces after being shown to the app user. The dominance is assessed by the ratio it was remembered and recognized after being shown in a group of two or three faces.