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The software company onOffice based in Aachen was founded in 2001 as a sole proprietorship. In 2015, the company expanded and established another headquarters in Vienna, Austria. In 2018, onOffice Swiss AG was founded in Switzerland to develop the Swiss market.

Since the beginning, more than 35,000 users benefit from the expert of the online-based real estate software onOffice enterprise.

With over 313 employees and owner Stefan Mantl, the onOffice team convinces not only real estate agents but also banks, broker networks as well as prefabricated house manufacturers with its profound know-how. The second business area of the owner-managed company includes the conception and realization of broker websites based on the in-house content management system.