Realtime Colors is described as 'If you want to choose a color palette for UI properly, the least you have to do is put them on a lofi UI or grayscale the entire UI on Figma, Adobe XD, or similar platforms to get a better idea of what those colors will actually look like on a product' and is a Color Picker tool in the development category. There are more than 50 alternatives to Realtime Colors for a variety of platforms, including Windows, Web-based, Mac, Linux and Flathub apps. The best Realtime Colors alternative is UI Colorful, which is free. Other great apps like Realtime Colors are Just Color Picker, gpick, Instant Eyedropper and Rickrack.
Most robust and featured color scheme editor.