This is a paid asset, but now you can download Ultimate Color Picker for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Ultimate Color Picker v1.0
A Mobile, PC, and Console compatible HSV + Alpha color picker widget with custom swatches to get you coloring right away.
This Color Picker is an Easy to Use & Portable widget that can be used to apply colors to any 2D/3D object at runtime.
This Color Picker features the following features:
Multiple Sliders: Allows fine-tuning of Hue, Saturation, Luminance, and Transparency to pick the perfect color.
Swatches: Allow for the quick application of pre-allocated colors. Useful for finding the ideal color palette for your project. (Set defaults on Prefab).
Quick Saving and Loading: This package’s Swatches function loads and save colors to and from a JSON file. This also allows for multiple swatch color palettes to be saved and can be loaded whenever the need arises and also makes it possible to transfer swatches between projects.
Simple and Performant: Its simplicity allows colors to be applied quickly and in real-time with minimal impact on performance with particular attention to minimal Garbage Collection
Highly Portable: Smart programming allows this widget to be used on multiple platforms including PC, Mobile, and Console
Controller Compatible: This widget can be used and navigated using any Controller including XBOX, PS4/5, and Nintendo Switch (More information in ReadMe)
Tested on unity version 2019.4 and above
Color picker uses HSV Channels
Works with any render pipeline
Very lightweight (Tested on low-end Mobile devices)
Includes Open Source Code
Highly Customizable
Changing, Add or Reduce selection of Hue Colors