About Us Innovation for lessors and lessees wy.by is an innovative Swiss company. wy.by designs, develops and maintains the first European, completely web-based reservation and management solutions for the rental business of different industries. wy.by offers much more than conventional advertising pages for rental items. With wy.by rental transactions can directly be done online between lessor and lessee. An innovation in the European market, which allows lessors to operate their rental business more efficient and customer-oriented. Renting made easy. Lessee can always search online, compare, and book directly online . It's so easy.