An Arizona State University study found that top-performing detectors correctly identified essay origin at a 93-98% rate, while individual tools produced false positives in roughly 1.3% of cases and human raters hit 5%. The article highlights five plagiarism and AI detection tools for students and copywriters. Quetext pairs its AI detector with the DeepSearch™ plagiarism engine for a single scan, with pricing from $0/month for up to 1,000 words per scan, Essential from $14.99/month for 100,000 words/month, Professional from $29.98/month for 200,000 words/month, and AI Detector Only from $7.99/month for 50,000 words/month. Grammarly integrates plagiarism and AI detection into its editor, with a Free plan at $0/month, Pro from $12/month billed annually or $30/month billed monthly, and Enterprise custom pricing for teams of 150 or more. PlagiarismCheck.org is described as a budget option for students, though its pricing is not specified.