Color Code Champion

Features
➤ Pick colors with RGB sliders, HSV sliders, or from images
➤ Output to multiple formats of RGB or HSV
➤ Support for alpha
➤ Bookmark your colors
➤ Export & import your bookmarks to local storage or a storage server.
➤ Copy to clipboard and share functions
➤ Support for OpenIntents' Pick a Color intent
➤ A dark and a light theme

Some features require Android 4.4 or up

Please try the lite version before buying.
https://play.google.com/store/apps/details?id=com.grantojanen.colorcodechampionfree