Dicode is a free dictionary and vocabulary-learning app from Nuagic SAS, available for iOS and Android. It brings nine subject dictionaries together in one place: general French, law and legal terminology, artificial intelligence, geography, Latin, Ancient Greek, philosophy, history, and spelling. The website offers access to 587,947 words and entries, with content designed for learners from primary school through doctoral level. In the general French dictionary, definitions are presented across seven levels of complexity, while other dictionaries provide levels suited to their subjects.

Users can browse entries, search instantly—including from conjugated or declined forms—and take quizzes covering topics such as synonyms, etymology, flags, chronology, and spelling. Dicode also includes spaced repetition, progress tracking, daily goals, badges, adjustable text size, and light and dark themes. Its definitions and learning materials are available offline, so the app does not require an internet connection for use. The site describes its content as drafted with AI models and checked automatically, with certain factual datasets supplied independently. It is offered without advertising or tracking.