As shown in the tutorial (https://neuroimage.usc.edu/brainstorm/e-phys/SpikeSorting). Klusters is a visualization tool that can be used for supervised spike sorting of the Kilosort output. However, Kcluster seems hard to compile on the Windows system. And Its function seems very limited. Cellexplorer is also a Matlab toolbox with a nice GUI. Phy has a built-in convert function to transform the output of kilosort to the format for phy. No matter which one, it seems to be better than the current one.
cellexporer from Buzsaki lab: https://cellexplorer.org/