JustSystems Corporation (Japanese: 株式会社ジャストシステム, Hepburn: Kabushiki-gaisha Jasuto-Shisutemu) is a Japanese software development house. The company's main products were a word processor, Ichitaro ("JohnnyOne"), a Japanese input method, ATOK. In 2010s, they focus on correspondence education and enterprise software.[1]

JustSystems Corporation
TYO: 4686
IndustryComputer software
FoundedTokushima City, Tokushima, Japan (1979)
FoundersHatsuko Ukigawa
Kazunori Ukigawa
HeadquartersTokushima City, Tokushima, Japan
Key people
Kyotaro Sekinada
ProductsSoftware and services
Revenue¥13,088 million (year ending 31 March 2007)
OwnerKeyence Corporation (43.96%)
Kazunori Ukigawa (13.43%)
Hatsuko Ukigawa (11.35%)
Number of employees
916 (2008)
SubsidiariesJustsystem Service Corporation
JustSystems US Holding, Inc.
JustSystems North America, Inc.
JustSystems Canada Inc.
JustSystems Evans Research, Inc.
JustSystems EMEA Ltd.
Dalian Justsystem Co., Ltd.
Corporate headquarters


JustSystems is based in Tokushima on Shikoku island in Japan. Its most recent business has focused on Java and XML-themed technology development. As of 2012, JustSystems is the only Japanese full member of the Unicode Consortium.[2]


JustSystems was founded in 1979 by Hatsuko and Kazunori Ukigawa, and was incorporated in June 1981. Early in the company's history, it created one of the first computer input methods for Japanese users, creating compatibility between QWERTY keyboards and Kanji characters. In the mid 1990s, JustSystems founded the Justsystem Pittsburgh Research Center near Carnegie Mellon University. In 1996, JustSystems purchased Claritech, a Carnegie Mellon startup run by David Evans, and renamed it JustSystems Evans Research (JSERI). In 1997, JustSystems went public and was listed on the JASDAQ Securities Exchange.

In 2006, JustSystems purchased the XMetaL XML authoring suite from Blast Radius to complement its xfy XML development platform. In 2009, Keyence Corporation became the largest shareholder of JustSystems. Later that year, Kazunori and Hatsuko Ukigawa resigned from the company.

See alsoEdit


  1. ^ 島, 大輔 (2017-03-05). "あのジャストシステムが大変貌を遂げていた―今や収益柱は「一太郎」「ATOK」ではない". Toyo Keizai. Retrieved 2019-03-31.
  2. ^ Staff (1991–2012). "The Unicode Consortium Members". The Unicode Consortium. Unicode, Inc. Retrieved 20 May 2012.

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