1 Database difference: Paperpass and HowNet differ in database source and collection scope. Paperpass mainly includes web resources, academic journals and conference papers on the Internet, while HowNet also includes a large number of dissertations and patent documents. Therefore, for the same paper, the similar content and repetition rate detected in different databases may be different.

2 Algorithm differences: Paperpass and HowNet are also different. Paperpass uses a detection algorithm based on text similarity, and HowNet uses an algorithm based on knowledge enhancement to deeply analyze the semantics and context of text content and judge whether there is plagiarism or similarity. Therefore, different algorithms may have different detection results for the same piece of paper.

3 detection version difference: Paperpass and hownet have different detection versions. Paperpass provides multiple versions for users to choose from, and HowNet only provides the final version for testing. Therefore, the repetition rate and similar content detected by different versions may be different.

Therefore, for specific papers, we should use a variety of tools to detect, in order to obtain more accurate results.