American Heritage Deluxe is a comprehensive dictionary and thesaurus application developed by Enfour Inc. It offers the entire text of the American Heritage® Dictionary of the English Language and Roget's II: The New Thesaurus in one convenient app. With nearly 300,000 terms, over 33,000 written examples, and 64 thousand professionally recorded sound files, this app provides a wealth of information at your fingertips.

The main features of American Heritage Deluxe include a unique three-way cross-referencing search, real-time progressive look-up, wildcard pattern searches, and fallback online search for esoteric or archaic words and the latest slang. It also includes a spelling suggestion dictionary, hyperlinking to appendices and between books, a pop-up pronunciation symbols chart, and IPA symbol conversion. Additionally, the app supports search from other applications, bookmarks with folders and editable notations, automatic search history, and a "Share" module for searching within other apps.

American Heritage Deluxe is available for iPhone and iPod touch, with support for iPad, iPad Pro, and macOS. It offers complete offline use, so no internet connection is required. With its comprehensive content and user-friendly features, American Heritage Deluxe is a valuable tool for anyone looking to expand their vocabulary and improve their language skills.