Phylogenetic trees are diagrams used to represent hypothesized evolutionary relationships between taxa. Despite being used throughout many branches of biology, they are poorly understood by undergraduate biology students. Deep time refers to the vast amounts of time in which evolutionary processes occur over. Such large amounts of time can be difficult for students to conceptualize. A poor understanding of phylogenetic trees and deep time can lead to misconceptions about evolution as a whole.

TreeDeep provides students with information on how to read and how NOT to read phylogenetic trees. It then allows students to apply the knowledge using a tree of life. The tree of life is time-scaled. The user must scroll through 50,000 pixels to reach the tips of the tree, giving a sense of how vast deep time is.