This could be the Garmin killer app – iSmoothRun Review

I saw the star ratings and read the reviews then purchased the app without a flinch. Eager to leave my garmin at home and use my Apple Watch Series 3 LTE for workouts. The main feature combination that I want to use doesn’t work: (Custom Workouts using Heart Rate Zones). This feature is documented to work but has never worked for me. Is this a known issue? Will this issue be solved in a future update? I’ve tried many many times to get the iSmoothRun app on my Apple Watch to use the watch’s heart rate monitor and it never works. I have given all health permissions and still. I want to leave my garmin and phone at home. I reached out to support via email and haven’t received a response.
Review by rubpic on iSmoothRun.