Word Vault is a comprehensive vocabulary builder app available on iPhone. It is designed to help users remember and internalize words they come across. Whether you're looking up mundane or exotic words, Word Vault allows you to amass a cache of words you love and learn them all.

One of the key features of Word Vault is its vocabulary review system. By using the app as your regular dictionary, it will remind you to review the words you've looked up. This system ensures frequent exposure to new words, enhancing your learning experience. The reviews are quick, fun, and effective in getting the words out of your phone and into your brain.

The app offers a robust offline English dictionary, as well as online lookup for esoteric words. It provides pronunciations, images, illustrations, and example sentences to aid in understanding. Additionally, Word Vault offers auto-complete and spell-check suggestions, thesaurus functionality, and customization of your word list with notes, sources, and favorites.

Please note that translation functionality can be activated with a one-time in-app purchase. Translations are provided for the words looked up, not for definitions. It is important to mention that translations are provided via Microsoft Translator, which may not have a 100% accuracy rate, especially for isolated words without context. An upcoming update will allow users to test translations in their language of choice before making a purchase.

Word Vault: Vocabulary Builder is a valuable tool for anyone looking to expand their vocabulary and improve their word retention. With its user-friendly interface and comprehensive features, it is an excellent choice for language learners, students, and enthusiasts alike.