Cardiogenic embolism (CE) undergoes the most critical course out of all types of cerebral infarctions and results in death in half of all cases within one year of development. Atrial fibrillation (AF) is the largest contributor to CE. The incidence of AF has increased with aging population demographics, but since almost half of all cases are asymptomatic, the development of critical CE in patients whose AF has remained undiagnosed is a major problem. Therefore, we are aiming to develop a new device to screen simply and accurately for AF in general outpatients. In this report, we independently developed pulse analyzer application determining whether or not the person suffers from AF. This application was installed to a Google 7-inch tablet. A Bluetooth signal conveys pulse information to the tablet from a pulse oximeter attached to the index finger of a patient. Then, our assessment of accuracy was conducted on general outpatients, including AF patients, as well as on inpatients with AF and volunteers without AF. The pulse analyzer, which was developed in order to screen for AF in a simple manner, had a sensitivity of 100% and a specificity of 88.6%, and was also highly accurate.