3000 Oxford Essential Word is an Android application developed by SoftForLife. It is a vocabulary builder app that contains 3000 English words from Oxford University. The app is designed to help users learn and understand English words easily with full English definitions, phonetics, and sound from Oxford Dictionary.

The app has six main functions that support learning: List Word, Learn Word, Testing, Training, Random Test, and Daily New Word. The wordlist is divided into four categories: New Word, New Learn, Remember, and Not Remember, to help users keep track of their progress. The Learn Word function offers a unique approach to learning by allowing users to complete a word (with disorder characters) four times, with suggestions becoming shorter after each round. The Testing function has four types of quizzes to help users revise their knowledge.

The app also offers additional features such as choosing the main definition for each word and activating online spelling in Advance settings. Overall, 3000 Oxford Essential Word is a comprehensive vocabulary builder that provides users with a variety of learning tools and resources.