Based on the dynamic fingerprint technology, PaperFree uses a short segment as the detection unit for comparative detection. HowNet's continuous similarity of 13 characters is judged as duplication by the system, and HowNet's duplicate checking system has a threshold of 5%, so it will cause errors when detecting the same article at the same time.

The main comparison scope of PaperFree is a small number of dissertations and a large number of network resources, while the comparison database of HowNet duplicate checking system includes academic discussion database, network resources and paper joint comparison database.

Most colleges and universities use HowNet to check the duplicate, but it is not excluded that a small number use paperfree, because the price of the latter is lower than HowNet.

Finally, I suggest you use HowNet to check the duplicate. After all, it is in line with the habits of more people, and it is also a common website (method) for paper duplicate checking in colleges and universities across the country.

The following is the related introduction of China HowNet: (You can have a look if you are interested).

China HowNet, founded on June 1999, is an academic platform of Tongfang shares controlled by China National Nuclear Corporation Capital Holdings Co., Ltd. HowNet is a national knowledge infrastructure (national? Knowledge? Infrastructure (NKI) was proposed by the World Bank in 1998. CNKI project is an information construction project aimed at realizing the dissemination, enjoyment and value-added utilization of knowledge resources in the whole society. On May 20 19, the online learning platform of Scientific Research Integrity and Academic Norms was officially launched in China HowNet.

In May 2022, the General Administration of Market Supervision filed an investigation into the alleged monopolistic behavior of HowNet. Subsequently, HowNet responded: resolutely support, fully cooperate and thoroughly rectify.