PaperPass and HowNet duplicate checking are two different duplicate checking systems, which use different databases and algorithms, so the duplicate checking results will be different.

PaperPass's database includes academic journals, papers and web pages. , the detection range is wide, so some parts similar to the original text may be detected, resulting in high red marking or repetition rate.

HowNet's database includes academic journals, dissertations, conference papers, Internet resources and other literature resources, with wider coverage and more comprehensive test results.

Different duplicate checking system algorithms and data stocks are different, and the duplicate checking results will be different. Therefore, when using any paper duplicate checking system, you need to choose a regular and reliable duplicate checking website. The first draft can use the free duplicate checking websites of paper series such as paperfree and papertime, and the final draft should use the duplicate checking system required by the school or periodical.

Therefore, we can't simply compare which system is stricter, but choose the appropriate duplicate checking system according to the specific situation.