Abstract: The SCImago Journal Rank (SJR) ranks journals into four quartiles (Q1–Q4). SJR
serves as a safelist for journal selection, when trying to avoid predatory journals, as journals that have been indexed by SJR are seen as having stringent publishing standards. An AI-based tool, the Academic Journal Predatory Checking System (AJPC), claims to be able to differentiate suspected predatory journals from normal journals. In this study, we asked (25 March 2023) AJPC to classify the top 2500 journals (based on SJR ranking). We found that 65.64% of these journals were classified as “suspected predatory”, 33.28% were classified as “normal”, while 1.08% of the journals could not be classified. A follow-up run (30 March 2023) returned different results (89.20%, 10.16% and 0.64%). This set of results is worrying, not only because of the number of SJR journals that are thought to be “predatory”, but also because of the difference in results when using the same tool a matter of days apart. We extended our analysis and looked at seven stand-alone publishers (Elsevier, Frontiers, MDPI, OMICS, Springer Nature (incl. Nature Portfolio), Taylor & Francis and Wiley). In total, we asked AJPC to classify 17,721 journals. The results confirm that we should be concerned about the classifications provided by AJPC. For example, 100% (4756) of Elsevier journals were classified as “suspected predatory”. Even Springer Nature (which includes the journal that published the AJPC paper) has journals which were classified at “suspected predatory”. We thus urge caution against relying on AJPC at present. We also urge the AJPC’s authors to provide an explanation as to why a journal is classified in a particular way, as part of their user interface. We are willing to conduct further analyses should AJPC be revised and updated as it could provide an important service to the scholarly community.