Apps like Polar Flow

Here are some great alternatives to Polar Flow by Polar Electro :
HR & HRV Logger
HR & HRV Logger
★3.3
CardioMez - Heart Rate Workout
CardioMez - Heart Rate Workout
★4.2
Cardio Training
Cardio Training
★4.4
Sportlyzer Pro Player App
Sportlyzer Pro Player App
★3.8
GPS Running Cycling & Fitness
GPS Running Cycling & Fitness
★4.8
Trackster
Trackster
★4.0
TrainingPeaks
TrainingPeaks
★4.3
Trainer Run, walk & bike
Trainer Run, walk & bike
★4.3
LITPro - GPS Lap Timer
LITPro - GPS Lap Timer
★4.4
EVOFIT - Running, walking & cy
EVOFIT - Running, walking & cy
★5.0
Sports Tracker Running Cycling
Sports Tracker Running Cycling
★3.5
TrainerDay - Indoor Cycling
TrainerDay - Indoor Cycling
★4.8
Caynax - Running & Cycling GPS
Caynax - Running & Cycling GPS
★4.4
Wahoo: Ride, Run, Train
Wahoo: Ride, Run, Train
★3.6
Garmin Connect™
Garmin Connect™
★4.1
My Run Tracker - Running App
My Run Tracker - Running App
★3.4