LEO Dictionary is a free multilingual software developed by LEO GmbH for iPhone users. The app offers access to an extensive range of online dictionaries that are always up to date. It includes 12 different languages, such as English, French, Spanish, and Chinese, among others. With over 2 million entries, LEO's dictionaries are a reliable source for understanding meanings, verb tables, real voice audio pronunciation, definitions, grammar, and etymology.

In addition to its dictionaries, LEO Dictionary provides a vocabulary trainer that allows you to create personal word lists and improve your vocabulary. You can access all your word lists on your mobile devices or desktop by creating a free account using a two-way synchronization method. The app also offers a forum where users can connect and ask language-related questions not answered by the dictionary. However, this feature requires a free user account.