Technicolor has recently upgraded the Color Assist application (originally supported for just Adobe Premiere) to now support Final Cut Pro X (FCPX). It's a simple way to play with color grades for different looks, but also gives you advanced controls to tweak every bit of your video color. Here's a look at how the new Technicolor Color Assist plugin interacts with FCPX.
You can check out the Technicolor Color Assist application and download a trial version over at the website https://www.technicolorcinestyle.com/
Free Trial Technicolor Cinestyle Color Assist Application for Adobe FCPX