First of all, PaperPass and HowNet use different duplicate checking algorithms. The algorithm of PaperPass is strict, but a simple comparison method may lead to misjudgment, and many normal references are plagiarized. HowNet's algorithm is relatively loose, and it will not be identified as plagiarism simply by repeating a few words. Therefore, in the duplicate checking rules, the two have different emphases.
Secondly, there are differences between PaperPass and HowNet databases. Although they have collected a large number of academic documents and web pages, their database sources and time are different, which may have a certain impact on the results of duplicate checking.
In addition, different duplicate inspection systems also have different sensitivity and threshold settings. This means that different duplicate checking systems may detect different duplicates of the same document. Therefore, when selecting the duplicate checking system, it is necessary to understand the characteristics of its sensitivity and threshold setting in order to better evaluate the duplication of papers.
To sum up, there may be some differences in the duplicate checking results between PaperPass and HowNet, but the specific gap is different because of the different versions of the paper and the duplicate checking system. In order to obtain more accurate duplicate checking results, it is suggested that when using PaperPass or HowNet to check duplicates, we should combine other duplicate checking tools and our own practical experience to evaluate and modify them.