We offer Single user executable-only licenses

  • US$2500. Single user conducting research at or for a for-profit organization
    • includes 2 years of free upgrades and support
  • Free. Single user conducting education or research in medical physics or radiation biology at and for a non-profit organization
    • includes 1 year of free upgrades and support
    • can be renewed each year as long as appropriate support funding remains in place from the National Cancer Institute

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.

Supported Operating Systems:
  • OS X 10.12 or newer
  • Debian9 and its variants such as Ubuntu 18
  • Debian8 and its variants such as Ubuntu 16
  • RHEL7 and its variants such as CentOS7
  • RHEL6 and its variants such as CentOS6

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