BEAST Software - Bayesian Evolutionary Analysis Sampling Trees

What is BEAST?

BEAST is a cross-platform program for Bayesian analysis of molecular sequences using MCMC. It is entirely orientated towards rooted, time-measured phylogenies inferred using strict or relaxed molecular clock models. It can be used as a method of reconstructing phylogenies but is also a framework for testing evolutionary hypotheses without conditioning on a single tree topology. BEAST uses MCMC to average over tree space, so that each tree is weighted proportional to its posterior probability. We include a simple to use user-interface program for setting up standard analyses and a suit of programs for analysing the results. 

What can BEAST do?

Downloading BEAST

Software and Downloads

Descriptions of the BEAST software and its associated utilities.

BEAST-Users mailing list 

Users are strongly advised to join the BEAST mailing-list. This will be used to announce new versions and advise users about bugs and problems. 

Send an email to or go to the mailing list site:

Getting started 

These tutorials use the graphical applications of BEAST to perform analyses using the provided example files:

And more Tutorials available.

Some downloadable packages containing tutorial worksheets and associated data. These are used in workshops and classes.

Citing BEAST 

The recommended citation for this program is:

  • Drummond AJ, Suchard MA, Xie D & Rambaut A (2012) Bayesian phylogenetics with BEAUti and the BEAST 1.7 Molecular Biology And Evolution 29: 1969-1973 full text

See this page for a more detailed list of publications for citing individual models and components.

Contents of this website 

BEAST Developers

The complete source code for BEAST is now distributed under the GNU Lesser General Public License and the source code, bug tracking database and information for developers is now hosted by Google:

BEAST clusters

These are the groups we know of providing public access to cluster resources that run BEAST. These groups are not associated with the BEAST developers and we can't provide assistance with using these resources.