Vstone Co., Ltd. (ヴイストン株式会社)

Vstone Co., Ltd. (ヴイストン株式会社) is a privately held Japanese maker of small humanoids of the Robovie series, previously known for its VisiON series that won five RoboCup titles. The company organised the world's first robot marathon in the ATC hall in Osaka: five miniature robots set off on 24 February 2011 on 422 laps of 100 m, and Vstone's own Robovie-PC HHT won in 54 hours, 57 minutes and 50.26 seconds, following the line autonomously with its head camera, about one second ahead of the runner-up.

The Robovie-PC (39 cm, 2.2 kg, Intel Atom) cost 399,000 yen in 2009 and was sold only in Japan; production has ended. Headquarters city and founding year are not given in the sources.