Viper Plagiarism Checker is a plagiarism and AI-detection software for students, teachers, and academic institutions built by ScanMyEssay. It scans documents in around 10 seconds against 10 billion sources including 16,000+ open-access journals, 60 trillion websites, and 20+ code repositories with 99.12% accuracy. The credit-based service supports over 100 languages with no monthly subscription required. Since 2007 it has scanned 6 million essays from 1.5 million users.