KAITO是山叶以VOCALOID语音合成引擎为基础开发CRYPTON FUTURE MEDIA贩售的虚拟歌手软件第二作；或此软件的印象角色（这只是软件的象征，不会在实际使用时出现）。于2006年2月发售，开放价格，官方估计系列软件实际价格约19,950日圆。由风雅なおと提供原声。日语第二套VOCALOID的产品，擅长歌谣曲、童谣。因为同类型软件的受众多是男性，发售当初只卖出500套，相比同系列MEIKO的3000套显得逊色，但是至2009年10月27日售出数已经与MEIKO同为约5000套。VOCALOID 3引擎声库KAITO V3是由CRYPTON FUTURE MEDIA开发并贩售，于2013年2月15日发售。

KAITO is a humanoid persona voiced by a singing synthesizer application developed by Yamaha Corporation using their new Vocaloid singing synthesizer technology under the codename of "Taro". His voice is sampled by Naoto Fūga. He has performed at live concerts onstage as an animated projection. Many songs have been made with him. He was the fourth ever released Vocaloid and the second in Japanese.