YABAI

About

Textbooks focus on formal Japanese that stays in the classroom. YABAI delivers the missing half: 308 essential slang, internet, and fandom terms, each presented on a card featuring bold Japanese typography. Every entry includes a definition, an authentic usage example, a guide to its appropriateness, and a background story. If a term's origin is unknown, it is honestly noted rather than fabricated. The project was fully created using AI agents in Claude Code. It supports 13 languages and functions offline. The experience has no streaks, tests, or experience points.