Skip to content



The Tandem Tool for automated chemical kinetic model development

Release Build Status Language grade: Python Coverage MIT license Python

Documentation: T3 Documentation

Source Code: T3 Source

Note: T3 is currently under intense development. Features described in these documentation pages which are still not implemented in the code will be marked with an asterisk (*).


T3 is a tool for automatically generating refined kinetic models.

The key features are:

  • Convenient: A single universal input file with an equivalent API, controlling all engines.
  • Flexible: Supports all features of RMG and ARC, while maintaining reasonable defaults for simplicity.
  • Structured: All outputs from all iterations are organized in an intuitive folder tree.
  • Easy: Designed to be easy to use and learn.
  • Robust: Captures lower-level exceptions, attempts to troubleshoot.
  • Restartable: Has a convenient restart feature that's being triggered by identifying existing iteration outputs.

Principal workflow

T3 scheme

At it's core, T3 iteratively calls RMG and an automated QM tool (currently supporting only ARC) to generate a kinetic model and refine it, respectively. The maximal number of iterations along with various control parameters can be determined by the user. Calculated thermodynamic properties and rate coefficients can optionally be uploaded to the community cloud, TCKDB*. T3 also queries TCKDB before instructing the automated QM tool to perform calculations.

Intended audience

T3 is intended to be used by individuals with prior knowledge in chemical kinetic modeling, and some experience in electronic structure (quantum chemical) calculations. This documentation does not intend to provide advice for which levels of theory should be used for particular systems although examples with specific levels of theory are given.


Python 3.7+

T3 stands on the shoulders of giants:

  • RMG for model generation.
  • ARC for automating electronic structure calculations.


This project is licensed under the terms of the MIT license.