A Bit Lacking
Some of the reviews are a tad too generous, while others are probably completely oblivious to EKG interpretation. There several rhythm interpretations lacking, PAC, PJC, MAT, etc. The descriptions could be written in a better format. However, the app is a great practice tool as long as it is not your only tool.
Eilimint about
Instant ECG - Mastery of EKG, v2.7