Welcome to the

HexSim Project

HexSim is a free, versatile, multi-species, life history simulator ideal for building models of animal and plant population viability, interactions, and responses to disturbance. HexSim models are spatially-explicit and individual-based, and HexSim individuals can be assigned dynamic life history traits. HexSim also includes a full genetics sub-model, making it a true eco-evo simulator.

HexSim is not licensed, and is available free of charge.

Example Uses of HexSim

Develop PVA models

Impose stressor interactions

Evaluate landscape connectivity

Conduct source-sink analyses

Model competition and predation

Explore landscape genetics

Simulate disease dynamics

Principal Citation

Schumaker NH, Brookes A. 2018.

HexSim: a modeling environment for ecology and conservation.

Landscape Ecology 33:197-211.


Nathan H. Schumaker

United States EPA

200 SW 35th Street

Corvallis, OR, USA

Model Coding

Allen Brookes

Kevin Djang

Mark Armour

Nathan Schumaker

Technical Support

Support for HexSim will be provided on a case-by-case basis, to the extent that time is available. Contact the author if you have questions, suggestions, bug reports, or other comments:


Contract Support

Contract HexSim model design, development, research, and analysis are available from:

The Computational Ecology Group


Financial Support

HexSim was developed under an agreement between the EPA, the University of Washington, and the DoD’s Strategic Environmental Research and Development Program (grant number SI-1541). These three institutions share ownership of the project, including the HexSim model source code.

US EPA Website

Interested readers may also visit a HexSim website maintained by the US EPA: