ColorTuner is for fine tuning the colors in a comp. You can use it to change the color or just monitor the color in context with RGB bars that show the difference between reference and target colors. Colortuner can also be used to deflicker because the live fg input is sampled every frame in auto RGB match mode. See video below for demo. v10 - with link ref / target track feature

v12 comes with auto menu on/off feature.