Bellabeat shell pregnancy app??? Thoughts...

Anyone ever use this Bellabeat Shell pregnancy app to listen for baby’s heartbeat? The reviews are actually really good it’s a 4 1/2 star rating for the app only for iPhones.... I have an iPad and was able to hear my own heartbeat but can’t seem to find the baby’s. Just wanted to know if anyone else has tried to use it and what their thoughts were on it.

And for those with negative comments understandable, but at the same time I listened to my heartbeat multiple times and all 3 of my other boys which were all different rates so doubt that it’s pre recorded. It’s also free....