Recently, smart devices have been employed for medical purposes, specifically to check for atrial fibrillation (AF), assess pulses and prevent stroke in patient with CVD. There is currently a paucity of information about how well these devices work diagnostically. Methodology: The current research conducted a literature search of articles that had been published between the years of 2012 and 2022 in PubMed, Medline, the Cochrane Library, the Web of Science, and other sources (Google Scholar, clinicaltrails.gov). We examined the main electronic databases. Due to the nature of the review, all kinds of studies were included, including descriptive studies, surveys, reviews, commentaries, and editorials. In the current research, the recommended methodology was employed to evaluate the risk of bias. The six distinct areas were addressed using the two-part tool. The studies' quality was assessed using the diagnostic accuracy study quality evaluation tool. Result: Four thousand two hundred twenty six subjects participated in a total of 14 studies that evaluated diagnostic accuracy using smart watches. The overall sensitivity of 91.80% was found in the 14 studies and the average accuracy of the 96.11% was found in the 7 studies reports as well as the remaining 7 studies are not stated. Conclusion: This review determined that smart watch technology currently has a high diagnostic accuracy for early detecting the stroke in patients with CVD as well as the cardiac arrhythmias.