There are several free spoken English course apps available for mastering the English language. These apps typically include a variety of features such as interactive lessons, quizzes, and exercises to help users improve their speaking, listening, reading, and writing skills. Some popular apps include Duolingo, Babbel, and Rosetta Stone. Additionally, many apps offer additional resources such as videos, articles, and audio recordings to help users practice their English in a variety of contexts. It's recommended to check out the reviews and ratings before downloading any app and also to use multiple resources to get the best out of it.