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Python codecov Build Status License: GPL v3


ChemTools is a free and open source Python library for interpreting the results of quantum chemistry calculations. The goal of ChemTools is to provide a toolbox by which the quantitative output of electronic structure theory calculations can be expressed in chemical language. ChemTools provides easy-to-use core functionality to compute fundamental descriptors of conceptual quantum chemistry, together with a flexible set of utilities allowing scientists to easily test their own discoveries.



ChemTools is distributed under GPL License version 3 (GPLv3)


The following dependencies will be necessary for ChemTools to build properly,


To install HORTON with conda:

conda install -c theochem horton=2.1.0

To install chemtools:

pip install .

Check our website for more detailed installation guide


To run tests:

nosetests -v chemtools


New contributors of all programming levels are welcome to join us. You can follow our developer guidelines for detailed information about contributing code, building documentation and quality assurance.


In anticipation of the first announcement of ChemTools in a scientific journal, please reference ChemTools as follows:

  • F. Heidar-Zadeh, M. Richer, S. Fias, R.A. Miranda-Quintana, M. Chan, M. Franco-Perez, C. E. Gonzalez-Espinoza, T.D. Kim, C. Lanssens, A.H.G. Patel, X.D. Yang, E. Vohringer-Martinez, C. Cardenas, T. Verstraelen, and P. W. Ayers. An explicit approach to conceptual density functional theory descriptors of arbitrary order. Chem. Phys. Lett., 660:307–312, 2016. doi:10.1016/j.cplett.2016.07.039.


This software was developed using funding from a variety of international sources including, but not limited to: Canarie, the Canada Research Chairs, Compute Canada, the European Union's Horizon 2020 Marie Sklodowska-Curie Actions (Individual Fellowship No 800130), the Foundation of Scientific Research--Flanders (FWO), McMaster University, the National Fund for Scientific and Technological Development of Chile (FONDECYT), the Natural Sciences and Engineering Research Council of Canada (NSERC), the Research Board of Ghent University (BOF), and Sharcnet.

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