CATs Core English is an Android-based application developed by CMEDT. It is a free education and reference app that helps users improve their English language skills. The app offers flexible practice materials that prepare users to take the CATs test, which is recognized by employers and meets international learning standards.

The app's 9 level program allows users to develop their English skills from an absolute beginner to an intermediate user, and makes learning fun and easy. The program is designed to be flexible and adaptable to the user's schedule and pace. The app offers a variety of practice exercises, including grammar, vocabulary, and comprehension, and provides instant feedback on the user's progress.

Overall, CATs Core English is a useful tool for anyone looking to improve their English language skills, whether for personal or professional reasons. The app's flexibility and comprehensive program make it a valuable resource for learners of all levels.