What Is Chai AI? Chai AI, also written as CHAI AI and most commonly searched as Ch ai is an AI chatbot platform where users chat with millions of community made characters, the Chai AI app lets you pick a character and start a conversation. It also lets you build your own bot from scratch. The platform is not new. Chai ai launched in 2021 and it hit 1 million users in early 2022. That was before ChatGPT and Character AI existed in their current form. So when people call Chai ai one of the original AI chatbot apps, that claim holds up.