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.

Example uses:

Develop PVA models

Impose stressor interactions

Evaluate landscape connectivity

Conduct source-sink analyses

Model competition and predation

Explore landscape genetics

Simulate disease dynamics

Development Information

Development of the HexSim model has been funded in part by SERDP, the Strategic Environmental Research and Development Program, and in part by the U.S. Environmental Protection Agency. It has been subjected to the Agency's peer and administrative review, and it has thus been approved for distribution and use. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government and shall not be used for advertising or product endorsement purposes.

Nathan H. Schumaker

U.S. Environmental Protection Agency

Western Ecology Division

200 SW 35th Street

Corvallis, OR 97330


Schumaker NH, Brookes A. 2018.

HexSim: a modeling environment for ecology and conservation.

Landscape Ecology 33:197-211.


Nathan H. Schumaker

United States Environmental Protection Agency

200 SW 35th Street

Corvallis, OR 97330


Software Development

Allen Brookes

Kevin Djang

Mark Armour

Nathan Schumaker


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

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:


Financial Support

The development of HexSim has been funded by both the U.S. Environmental Protection Agency and by SERDP, the Strategic Environmental Research and Development Program, through a grant (number SI-1541) to Dr. Joshua Lawler at The University of Washington.