The HEART risk score can be used to determine the chance of a patient getting a myocardial infarction within the near future as described in https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2442661/. The app consists of a very intuative and easy to use interface and includes a link to the original publication as a reference. The author of the app is not affiliated with the research group involved in creating the HEART score, but created the app as a convenient tool and reference.