"Je suis CHARLIE" is an iPhone application developed by Nice-Matin, available for free in the Education & Reference category under Books subcategory. The app aims to serve as a platform for users to express their stance on freedom of speech, symbolized by the phrase "Je suis Charlie". Users can mark their location on a world map, showcasing unity and solidarity across different beliefs and opinions.

The main feature of the "Je suis CHARLIE" app is the interactive world map where users can geographically represent their support for freedom of speech by stating "We are all CHARLIE". This simple yet powerful tool fosters a global sense of togetherness and unity in upholding this fundamental value.