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Try & Buy

The single-user implementation of PFM, Tetra SDM version 3.6.0, is available for download and purchase.


SDM Demo

SDM Personal







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+Tetra SDM Demo does not require activation.
*Prices are in US dollars or equivalent and are subject to change without notice.


Download and install Tetra SDM via the "download" link on this page. To activate the non-demo features of Tetra SDM, you will need to purchase an activation code.

To purchase an activation code, click the appropriate "Buy Now" button. Your activation code and instructions on registering your copy of Tetra will then be provided to you by email within 24 hours.

Upgrades from Tetra SDM Small Decisions to Tetra SDM are also available, as is Tetra GDM, the multi-user implementation of PFM. For more information, and educational pricing, please contact

NEW BOOK: Pure Economics On Neural Network Accuracy and Validation On Neural Network Mini-Batches On Neural Network Training Algorithms Spectrum and Optimization Algorithms ChoiceRobot

The Foundations

Decision Theory Utility Theory


Download Tetra Tetra Quickstart Guide Tetra Online Documentation


Numerical Mathematics


An Elementary Demand Theory Error Ordinal Utility and Indifference Curves Von Neumann's Error Game Theory: Whose Values?