Paper duplicate checking tool is one of the indispensable tools in academic research, which can help us to detect the duplicate content in the paper and ensure the academic integrity. The following are some common tools for paper double checking:

1.Turnitin: Turnitin is the world's leading platform for testing academic integrity and originality, which is widely used in academia and educational institutions. Using advanced text matching technology, it can detect similar contents in papers and provide detailed reports and suggestions.

2.Grammarly: Grammarly is a powerful grammar and spelling checking tool, which can also be used for double checking. It can detect repeated sentences, phrases and vocabulary in papers and provide suggestions for revision.

3.Copyscape: Copyscape is a tool specially used to detect the repetition rate of web content, and can also be used to check duplicate papers. It can detect plagiarism in papers and provide detailed reports.

4.Plagscan: Plagscan is a professional duplicate checking tool, which is widely used in academic and publishing circles. It uses advanced algorithms and techniques to detect similar contents in papers and provide detailed reports and analysis.

5.Viper:Viper is a free duplicate checking tool for students and teachers. It can detect the repetitive content in the paper and provide detailed reports and suggestions.

6.Quetext: Quetext is an online duplicate checking tool, which can help users to detect duplicate contents in papers. It provides quick duplicate inspection results and detailed reports, and supports multiple file formats.

The above are some commonly used paper duplicate checking tools, all of which have different characteristics and functions. You can choose the tool that suits you according to your personal needs. No matter which tool you use, you should pay attention to the principle of academic integrity and avoid plagiarism.