Nihon Kotsu as the "Prince of Taxis." The company was founded as a sole proprietorship in 1928 and reorganized as a stock company in December 1945. It began as a limousine operator and expanded to taxi service in 1940. NK operates the most popular taxi hailing mobile application in Japan, Japan Taxi. Toyota invested 500 million yen in the app in 2017, followed by a second 7.5 billion investment in 2018. Tokyo Musen, a major rival of Nihon Kotsu in the Tokyo area, joined the app later that year in an effort to counterbalance foreign rivals such as Uber and Didi Chuxing.
Shabbos App Yaakov Menken wrote in early October 2014 that while it was true the Shabbos App had attracted a great deal of attention and discussion, he was pretty sure the app is a hoax, "designed to make Orthodox Jews look bad by demonstrating their focus on … what, precisely, I’m not sure ..." intended to "mock attempts by serious, committed Jews to face the new challenges presented by modern technology". According to one of the developers, several rabbis are on board with the project whom the developer described in September 2014 as "Orthodox and knowledgeable in Torah and halacha", though he