IAÈO is a free educational app designed for those interested in the Marquesan language, providing a rich lexicon with over 20,000 words. It features translations in both French and English, and users can explore dialectal variations from different islands of the Marquesas. The app is particularly useful for language learners, native speakers, and researchers, as it aims to preserve and promote this unique linguistic heritage.

Key features include a bilingual interface, optimized search capabilities, and offline access after the initial download. Users can navigate through the dictionary alphabetically or search directly for specific terms. The app is regularly updated with new entries, ensuring it remains an invaluable resource for anyone looking to deepen their understanding of the Marquesan language.