Methods, systems, and storage media for distinguishing third party resources (TPRs) with respect to first party resources (FPRs) are provided. A client system generates and renders a graphical user interface (GUI) comprising one or more graphical objects in a client application. The client system identifies resources corresponding to individual graphical objects. The client system communicates the identified resources to a verification service, and obtains indicators indicating TPRs to be distinguished from FPRs. The client system applies a distinguishing effect to the TPRs based on the received indicators. Other embodiments may be described and/or claimed.