Systems and methods for templated, configurable, responsive content items

System and methods for displaying one or more assets on a client device based on device characteristics are provided. Code is transmitted to a client device. The code, when executed by the client device, causes a processor of the client device to determine a first device characteristic of the client device. A first layout may be selected based on the first device characteristic. The layout may include one or more cards. Each card may correspond to one or more assets. Each card may be modified based on a corresponding card characteristic. One or more assets may be requested. The assets may be displayed on the first client device. The code may be transmitted to another client device, which may select a different layout based on a different device characteristic.