I like this app for Apple Watch but... sometimes my Watch records false data. I have to go into Health and delete readings sometimes (like it says 190bpm when I was just walking slowly, and I could feel my heart rate was not that high). Even after deleting those entries from Health, those false readings still show up in Cardiogram. This throws off all my data. I wish it would refresh or allow me to delete those bad readings from Cardiogram.
Other than that, I like it a lot.
FormerFan69 about Cardiogram: HeartIQ MigraineIQ, v1.2.2