The performance of the QUBE protein force field is tested through comparisons between experiment and molecular dynamics (MD) simulations for a set of twenty dipeptides, the glycine tripeptide and alanine pentapeptide, and a range of small folded proteins. This benchmark testset is similar to those used in the development of protein force fields such as AMBER ff15ipq, AMOEBA, CHARMM36 and OPLS-AA/M. As we shall show, the QUBE protein force field is competitive with standard transferable force fields for the dipeptide set and alanine pentapeptide, while retaining the experimental structures of small folded proteins reasonably well. To encourage further testing of the QUBE protein force field, MD input files for the molecules studied, as well as the necessary scripts to convert the QM electron density to QUBE force field format have been made available (). Finally, in the conclusions, we outline a roadmap for future improvements to QUBE.