Fluent - Help people speak English fluently.

Problem

Since nowadays we work with people all around the world, English is the most important skill for efficient communication and study. Thus, there are so many tools out there to support people learning English, from flash-card to chat-bot. However, the majority of such tools focused on entry-level people, or kids, who just get started with English. People who demand higher English proficiency often attend classes held by professional English teacher. However such classes are limited and time consuming.