Master English Ltd is a company that specializes in providing a mobile application designed to help Spanish-speaking adults achieve advanced English language proficiency, facilitating career advancement. The app leverages artificial intelligence technologies and personalized learning optimization to ensure efficient language acquisition. Originally launched in February 2021, the app quickly gained traction and is now available on iOS and Android platforms across Spanish-speaking regions in North and South America. Master English Ltd's core team has over a decade of experience in developing successful digital language learning solutions. The company's mission is fueled by the understanding that advanced English skills can enhance professional opportunities and enable international collaboration. Master English is focused on expanding its target markets and possibly extending its tech solutions to other languages. The app uses patented technologies such as Speak with AI® for pronunciation coaching and NLP & NLU for grammar correction, actively developing new learning technologies that improve educational outcomes.