CRO ( for Web/Apps/Software) is not about the color of buttons changing but changing prospects' behavior based on deep analytics. I analyze your users' behavior, dive deep into your data, and show you the bottlenecks (usually not connected to the colors of the button or menu:). That's why my clients reach outstanding results. I have 0 unsuccessful projects - just check out my Upwork profile. https://www.upwork.com/freelancers/pikaivan