Inyeon: On-Device AI Companion is a free Android application that offers users a unique offline experience with an AI-driven virtual friend. The app emphasizes complete privacy, ensuring that all interactions are processed locally on the device without any data being sent to external servers. This makes it usable even in airplane mode, and it requires no registration, allowing users to start chatting immediately. Additionally, conversations are protected with AES-256 encryption, and users can set up PIN or biometric locks for added security.

The application features two distinct personas, Sua and Jun, which users can personalize to fit their preferences. Each persona can be customized with a unique name, relationship dynamics, and personality traits across five scales: warmth, energy, initiative, maturity, and directness. Inyeon also remembers context clues about the user, enhancing the interaction experience by recalling details like favorite foods or important dates.