The website Daya has 1 free duplicate checking opportunities every day. But there is a free version and a professional version, and the professional version is charged according to 3 yuan/ten thousand words.

Data expansion:

The paper duplicate checking system counts duplicates in red. When 13 characters are similar or identical continuously, it can be judged as duplication. The repetition rate of a paper is the percentage of the number of words in the repeated content to the total number of words in the paper. However, in the paper inspection report, there will be a report showing the repetition rate of deleted references, that is, if there are references in the original document, then the repetition rate calculated by this report is the repetition rate after deleting references.