Paperfree: a professional paper duplicate checking assistant, providing users with good paper duplicate checking and paper detection services. The software has a huge comparison database, covering more than ten file types. The duplicate checking process is safe and confidential, and the detection results are highly accurate.

Papertime: a broad-spectrum duplicate checking software. Its database includes academic journals, dissertations, patent documents, game newspapers and so on. The detection result is accurate, the similarity and the number of repeated words will be displayed, and a list of similar documents will be listed.

The database and algorithm of each paper duplicate checking system are different, and the final detection results will be different. Therefore, when choosing duplicate checking software, we must choose it according to the requirements of schools or institutions and personal needs.