What it compares
The tool lists representative dynasties or period transitions for Korea, China, and Japan in chronological order. Korea focuses on major state transitions such as Silla, Goryeo, Joseon, and the Korean Empire; China highlights unifying dynasties and ruling-house changes such as Qin, Tang, Ming, and Qing; Japan emphasizes capital, court, shogunate, and modern-state transitions such as Nara, Heian, Edo, and Meiji.