Cardiff, Wales, UK
Tel: +44-(0)29 2064 6080


Welcome to the OpenFTA website.

OpenFTA is an advanced tool for fault tree analysis. It has an intuitive front-end which allows the user to construct, modify or analyse fault trees. OpenFTA has been designed to gain wide international acceptance for fault tree analysis, particularly in the aerospace, nuclear, medical equipment and defence fields.

Please consider joining our open public mailing list!

...if you are interested in the OpenFTA community, would like to contribute to its development, follow developments or have user questions and discussion topics. To subscribe to this group, send an email to:, or visit openfta-list for more options.

We are also on github

Patches, pull requests and forks welcome.

See - current updates to build OpenFTA on 64-bit Linux (Debian)

OpenFTA is the open source product name for Formal-FTA, a product developed by Auvation. The OpenFTA brochure is available in PDF format.

Key Benefits

  • Advanced user interface to create and edit fault trees
  • Powerful algorithms for determining minimal cuts and failures, including Monte Carlo simulation
  • No limits (other than physical) on the numbers of trees and events, and even on the numbers and depths of transferred-in trees
  • Cross-platform support (upon request)

All software on this site is covered by the GNU General Public Licence (GPL). It is provided without warranty and may be used free of charge within the terms of the license.