TimeTree is a free public database developed by S. Blair Hedges and Sudhir Kumar, now at Temple University, for presenting times of divergence in the tree of life.

[1][2] The basic concept has been to produce and present a community consensus of the timetree of life [3][4] from published studies, and allow easy access to that information on the web or mobile device.

The original development of TimeTree, by Hedges and Kumar, dates to the late 1990s, with initial support from NASA Astrobiology Institute.

[5] TimeTree users can search for the names of two species, such as cat and dog, to obtain the mean and median time estimates for their divergence, in millions of years.

Separately, a table lists the time estimates, downloadable as a spreadsheet, from each study along with references and links to the abstracts of the original articles.