There are some differences between PaperPass and Paperyy in the strictness of duplicate checking. Although they all provide paper duplicate checking service, the duplicate checking algorithm and database source of each system may be different, so the strictness will be different.

Overall, the duplicate checking rate of PaperPass may be higher than that of Paperyy. This is mainly because the database of PaperPass contains more academic journals and dissertations, and its detection algorithm may be stricter. In contrast, Paperyy's database pays more attention to Internet resources, and the algorithm may be more relaxed in some cases.

It should be noted that the duplicate checking rate of each system has certain reference value, but the final duplicate checking result still depends on the detection system used by the school or institution. For the first draft of the paper, it is suggested that free duplicate checking software such as paperfree, papertime and paperday can be used. For the final draft, use the duplicate checking system required by the school. Ensure the accuracy and effectiveness of duplicate checking.