I ordered a bluetooth cadence and speed pickup, see link and I would like to use my old galaxy S4 to track my routes. Is there app that has cadence as well as speed etc., and shows on the screen all the time?

Amazon.com : Jarv Bluetooth 4.0 Cycling Speed and Cadence Bike Sensor for IPhone 4S, IPhone 5/5C/5S/ 6 and 6 Plus, new IPod touch and other iOS Bluetooth devices- Black : Heart Rate Monitors : Sports & Outdoors

Thanks,
Marty