the Fitbit mobile app
Tap stats and heart-rate to cycle through, ot to turn off. Select the default stats To display, heart-rate on or off and if/when battery appears. (Via settings in the fitbit app that syncs with your watch)
You can also customize your personal brand-name and change colors for all elements, including the background.
The app requires permission to access your heart-rate monitor and internet (required to provide a purchase code, and to validate your license).
The watch-face comes with a free 30 hour trial period, and if you like it, you can purchase for only $1 USD. (Plus applicable taxes for your region) Payments are via k-pay.io, anytime during the trial, via the settings in the fitbit app. K-Pay accepts PayPal or Credit Card (Surcharge for credit card)