Nice app! An idea to make it slightly more minimalistic and functional. Remove the "Hex" button and just cycle through different modes when user clicks on the code field. Show something like [RGB: 128,10,255], [HSB: 269, 245, 255], [HEX: #800AFF] and remember last mode that was used.
A downloadable tool for Windows
Portable .exe file to pick colors from the screen. Just drag-and-drop the mouse from the little box to the screen. The color is automatically copied into the Windows clipboard.
Click download now to get access to the following files: