mutex

mutex is a Japanese software company that offers application development, UI and UX design and AI solutions. Its stated aim is to make the handover of information seamless, removing wasted effort such as keying paper invoices into systems by hand or writing up meeting minutes. The company says its application development work has covered projects for listed companies and universities, and that its AI team includes people who studied in or graduated from the electronic and information engineering field at the University of Tokyo. Its named product is Reze, an AI and data application for hospitals that turns medical claims (receipt) data into a database and uses generative AI to support work-style reform, management reform and shared knowledge, with the goal of easing staff shortages and raising productivity. The company's news list shows releases about Reze, including exhibiting at a medical DX expo in Tokyo and a feature for importing returned claims into a billing workspace, and it announces a funding round of 280 million yen on 30 September 2026. The site also covers recruitment, contact and material requests, and is published in Japanese.