We offer three rates of "Standard executable-only licenses" and an "Expert source code license."

Standard executable-only licenses

  • US$2500. Single user conducting research at or for a for-profit organization
    • includes 2 years of free upgrades and support
  • US$  800. Single user conducting research at and for a non-profit organization
    • includes 2 years of free upgrades and support
  • Free:         Single user conducting research at and for a non-profit organization in one of the least developed countries (evaluated on case-by-case basis)
    • includes 1 year of free upgrades and support

While most users will find that they can do everything they need with TOPAS without writing any C++, our standard licenses include the ability to extend TOPAS by writing and plugging in your own additional geometry components, scorers, filters and physics lists. We will also provide an exchange where users can share their TOPAS extensions with others.

Supported Operating Systems:
  • OS X 10.9 or newer
  • Debian8_amd64
  • Debian6_ amd64
  • RHEL6_x86-64

For answers to some common questions, see our FAQ

To read our exact license terms and apply to become a TOPAS user, go to Registration


Expert source code license:

This is a fundamentally different license intended for research organizations that wish to build an extensive program around TOPAS and that believe this work requires full access to the TOPAS kernel source code:
  • Includes full access to TOPAS source code repository for one year but no right to redistribute this code outside of your organization.
  • Provides expert advice on how users might implement changes deep in the code for their own purposes.
  • The one year term applies only to new source code updates and advice; it does not limit your ongoing use of the code you have already obtained.
  • Covers up to 20 users at your organization.
  • US$50,000. per year
  • Note TOPAS MC Inc. may accept some payment as in-kind contribution of software effort

To discuss terms, contact perl@topasmc.org