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Technology CHinese with Audio Technologies (CHAT) is a web-based language learning tool for learners of Mandarin Chinese which helps them with the correct pronunciation of tones and formulation of words. CHAT’s tonal assessment engine addresses the problem of the four tones in Mandarin Chinese and offers immediate graphical feedback to the user. The platform is built in HTML5 and can be deployed as a standalone platform, or as Middleware integrated into existing websites or e-learning products.