RATIO is a tool I use to help me dial in my lighting ratios on set, and then later as a tool to match and analyse shots when grading.

The basis of the system is a highly adjustable DCTL (Davinci Colour Transform Language) script that is used to highlight the specific exposure values you want to hit on-set. When adjusted to your purposes, you can then export a LUT that will highlight those exposures on your monitor or camera. I have also included some pre-generated LUTs with the settings I commonly use.