WordWeb American Audio is a comprehensive American English dictionary and thesaurus available on iPhone. It offers 70,000 audio pronunciations, 285,000 words, phrases and derived forms, 225,000 word sense definitions, and 70,000 usage examples. The app has a great user interface and is easy to use. It allows users to search for words using alphabetical listings and fast pattern-matching search. Users can also customize search options such as case and derived forms. The app is available offline, and there is also a smaller version without audio available on iTunes.

WordWeb American Audio also features an intelligent word entry that suggests possible correct spellings as you type and lists words that sound the same or are often confused. This feature is particularly useful for those who struggle with spelling or frequently encounter homophones. The app also includes synonyms and similar words, and has a filter search feature that allows users to search for specific parts of speech such as nouns, verbs, adjectives, and adverbs.

Overall, WordWeb American Audio is an excellent tool for anyone looking for a comprehensive American English dictionary and thesaurus. It is fast, easy to use, and offers a wealth of information and features that will help users improve their vocabulary and language skills.