Since the beginning of this century, widespread use of the internet and some weaknesses of the existing system have changed the scientific publishing model (1). This new model, wherein authors pay publishers for their services, is termed "open access". In the last decade, the number of open access journals and the articles they publish have increased rapidly, and some journals have gained a high level of scientific prestige in their field. Despite the rapid growth of the open access market, its share of the whole market remains small. According to an estimation by Delta Think (Carlin 2017), open access accounts for 20%-22% of market volume and 5%-9% of market value (2). This system provides rapid and open access to scientific information and data. However, some publishers do not hesitate to use this new model for unethical purposes and have begun to accept and publish scientific articles without a genuine peerreview process. Jeffrey Beall and his blog (Scholarly Open Access) played a key role in unveiling these unethical publishers and journals. He became interested in this topic when he received a spam e-mail in 2009. In 2010, he coined the term "predatory open