The complete EKG - SecondLook™ mobile app is a study aid for learners of the medical sciences to self-test their level of knowledge about this important diagnostic test, which is a standard tool in cardiac medicine. The complete app covers the basics of EKGs and their diagnostic value in the context of various cardiac pathologies, including arrhythmias, hypertrophies, infarctions, conductance aberrations and others. Specific diagnoses and applications are reviewed in a stepwise fashion including potential concerns and limitations.