This tool gives you an interface in which you can create personalized color palettes to help you create your world. You can then import the color palette in your scene to let you see how well those colors will look inside your scene.
In this tool you can also create simple moodboards. Import your images, resize them and organize your moodboard as you want to help you bring life to your imagination !
No need to go back and forth on other software to check on your references; everything is ready to use in editor !