Doors is an access control application that facilitates access to doors and turnstiles. Users can perform all transitions with a single click through the mobile application or with a QR code that is created instantly for the user. It can be easily integrated into existing transition and personnel attendance control systems, or it can be installed as a stand-alone compact system. By reducing the number of hardware needed in the access control system, it enables the management of access permissions from a simple turnstile system to hundreds of doors in your office. Doors, a minimal access control system, consists of a mobile application, management interface and some IoT hardware and provides a convenient user experience and cost advantage by reducing the number of hardware required compared to conventional systems.