This is an app for Fitbit OS to watch the current ticker price of cryptocurrencies.
To build this app yourself, you have to own a Fitbit Ionic and visit this website: https://studio.fitbit.com/
To download the clockface directly follow this link on your smartphone: https://gam.fitbit.com/gallery/app/5ef05d07-349b-4953-b427-d27b4856f209