The app provides information about licensed taxi companies in Bulgaria. Currently it supports 5 cities - Sofia, Varna, Bourgas, Pleven and Rouse.
Search by car plate number (or part of it). If it is a licensed taxi, information about the car make & model, driver and taxi company will be displayed. An alert will be displayed in case there is no match.
Data source - https://opendata.government.bg and the local authorities.