Prototype Ltd. (株式会社プロトタイプ) is a Japanese software company founded by Toshio Tabeta, a former producer of Interchannel. While still with Interchannel, Tabeta's team was responsible for mainly developing and publishing versions of visual novels originally published by VisualArt's for consumer platforms like the PlayStation 2 and PlayStation Portable. After Prototype split off from Interchannel, the company still continued to work with VisualArt's. Prototype is also involved in producing mobile phone ports through VisualArt's Motto which Prototype manages. Prototype has also produced a set of drama CDs based on Key's visual novel Clannad.
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