ProDict - Eng Viet Dictionary is an English-Vietnamese dictionary app developed by Leonard Nguyen. It is an excellent tool for advanced English learners with more than 300,000 English words in its extensive collection. The app shows a word in both English and Vietnamese definitions on one screen, making it easy for learners to understand the meaning of the word.

One of the most useful features of ProDict is that it finds similar words instantly when mistyping. Additionally, the app bundles with a great offline English to English dictionary, which is straightforward for learners to understand than most other English dictionaries. Synonyms are shown in different colours to represent the similarity with the root word. The app has regular updates that contain new English words. The simple interface of the app makes it easy to use, and it has an awesome sample sentences database. Moreover, it contains a collocation dictionary which is extremely useful for advanced English learners. The app also offers login via Google or Facebook to sync personal data.