REO is a Tahitian-French lexicon app developed by the Ministry of Culture of French Polynesia. The app contains over 16,000 words in the Tahitian language with their corresponding French translations. The app is designed for both beginners and experienced learners of the Tahitian language. One of the standout features of REO is that it operates without an internet connection, making it a convenient tool for users on the go.

The app's interface is simple and easy to use, with a search function that allows users to quickly find the word they are looking for. The app also includes a history feature that keeps track of previously searched words. Overall, REO is a useful tool for anyone interested in learning or improving their proficiency in the Tahitian language.