Tree of Life - ToL App is an educational and reference iPhone application offering an interactive family-level phylogeny of living beings. Drawing from a synthesis of data from numerous published studies, it presents main organism groups from Bacteria to Vertebrates as collapsed branches that users can expand to explore family-level relationships. The app boasts over 7000 families in its current version, providing a comprehensive view of evolutionary connections.

Users can engage with the app through various features like zooming in and out to navigate the extensive tree, tapping on images for family details and quick links to Wikipedia, collapsing clades for summary purposes, exploring specific subtrees, and utilizing a search function to locate organisms by common or scientific family names. Additionally, the app includes a time scale for tracking lineage divergence dates and fossil family extinction dates, ensuring an updated representation of evolutionary relationships.