Kardia is not listed on Amazon AppStore.
Kardia is listed on Google PlayStore, but when viewed from my BB Classic the message is "Your device isn't compatible with this version".
Kardia's list of compatible Android phones is very limiting: https://alivecor.zendesk.com/hc/en-us#compatibility
There is promising comment from a user who has two incompatible LG V30+
phones, and Kardia apparently works with one of those phones! This feedback suggests the official compatibility list is not exhaustive, and that it instead reflects the devices the publisher has physically verified in-house.
This app would be challenging, and even if we get it working, only the publisher would be able to test that its working 100%. Is that an acceptable risk?
Do you specifically need Kardia or can another app do the same thing?