The app is unable to detect or connect to my Viiiiva HRM. The online User Manual instructions in many instances does not describe what is displayed on the app screen. 4iiii tech support is also non-responsive. It’s as if they don’t care about helping customers. Often they don’t even respond and when they do respond the answers don’t address the problem.The HRM doesn’t stay connected via Bluetooth to the RWGPS app. It connects but loses the connection during the ride only to reconnect at the end of the ride. My Stages PM has no Bluetooth connectivity issues. The Wahoo KICKR HRM stays connected. Fortunately the HRM works with the elite HRV app.

I got a new Podium Precision power meter, installed it, and used it with no problems. This morning I realized that there was a firmware update available on the 4iiii app. Everything seemed to update okay. Went for a ride later and no more cadence or power readings. Completely blank. So I unpaired from my Garmin and repaired the pm. Still nothing. Then I noticed when I tried to perform a factory reset from the app that it will not let me. It simply states there was an error. I have unpaired and repaired from the app. Even reinstalled the app several times. Nothing works. It pairs just fine and will even calibrate from my 520, but nothing is right on the app. I cannot rename it, cannot zero it, cannon reset it. So frustrating. I’ve had the pm for one day and the app has made it all but useless!*EditI reached out to 4iiii customer support just before midnight on Saturday night. By lunch on Sunday I had a reply from Wriley at the cs department with this solution that worked perfectly for me. Her it is: Please follow the steps below:Open the 4iiii App and connect to your powermeter by adding deviceDelete your powermeter from the App by swiping left on the powermeter field and tapping deleteForce close the appRestart your phoneConnect to your powermeter by adding deviceTap on the powermeter field to access Device SettingsInstall available Feature Update. This includes the Chipolo tracking functionality.After the Feature Update has been installed, you should now see power and cadence in the Workout page of the app.*I have changed my rating from 1 star to 4, not because of the app but because of the excellent care I received from 4iiii customer support staff!!!

I bought a Viiiiv in hopes of replacing my garmin 910. The Viiiiv is a great HRM, very comfortable and seems to work as well as or better than the garmin HRM.The app on the other hand is nothing more than a demo. There are two major problems that have made this app unusable. 1. The GPS is not turned on automatically. You have to start the GPS and start your workout separately. 2. Workouts are not automatically saved and there is no pause. Both of these have caused me to lose my data from my workout. On top of the 2 major flaws, the app is not very usable. You have to connect to the HRM every time you start the app and then start the gps and then start the run. It takes way too long. Also there aren't any real features other than showing you the instantaneous data.

I wished I had read some of the reviews. To start with, support was good to identify my problem which was I got a new bike and now have two sets of Precision crank meters - the App does not support multiple sets of meters.First thought that came to me was, “Am I the only person that has multiple sets of these crank meters?” Answer is no. If you have more than one set of crank meters you have to have a unique device just for that set.I can only hope that 4iii app designers read this and at least consider adding either the option for multiple meters or at a minimum a notice on the app that gives the user an error message to tell the user can not attach multiple meter devices.