ISSEN is an AI‑driven voice tutor that enables real‑time spoken practice in a conversational format. Users can engage in role‑play scenarios such as business meetings or personal conversations, and the AI tutors retain prior interactions while offering distinct personalities, accents, and complexity levels. The app emphasizes immersive speaking practice by allowing learners to talk for unlimited durations and adjust tutor characteristics to match their goals. Its approach relies on AI‑guided dialogue to simulate authentic language use and support fluency development.