NutMaat classifies stellar spectra on the MK Spectral Classification system in a way similar to humans — by direct comparison with the MK classification standards, based on the MKCLASS C package. It determines spectral type by comparison to a standard library, and can evaluate the quality of the classification. The code detects various spectral peculiarities, such as barium stars, carbon-rich giants, and Am stars, and can classify spectra in the violet–green region in either the rectified or flux-calibrated format. NutMaat can also batch large number of stars for classification.