When Wrtn⁠(opens in a new window) launched, it focused on individual productivity, creating a set of AI-powered writing assistants and note-taking tools to make everyday work faster.

But productivity was always just the beginning. The team’s bigger vision was to make AI a natural language interface for everyday life.

In Korea, where digital culture already embraces character-driven platforms like KakaoTalk and LINE Friends, Wrtn saw an opportunity for what they now call Lifestyle AI: technology designed to be approachable and capable, helping people learn, create, and explore in ways that deepen over time.

To make AI more accessible to everyday users, the team invested in persona-based prompts, memory scaffolding, and careful localization so interactions felt effortless and natural in Korean slang and cadence. That work led to Crack, Wrtn’s open-ended character chat platform, which quickly became Korea’s top-grossing chat app by giving people a familiar, low-friction way to explore storytelling, language learning, and self-expression.