Systems and methods for providing complementary content on linked machines

A system comprising:

• a non-transitory computer-readable medium storing computer-executable instructions;
• and
• one or more processors in communication with the non-transitory computer readable medium that, when the computer-executable instructions are executed by the one or more processors, the one or more processors are configured to:
• receive, from a first machine, first authentication credentials including a user identifier user to authenticate a user, the first authentication credentials being provided during a first session of use of a website through the first machine;
• determine whether second authentication credentials received from a second machine match the first authentication credentials, wherein the second machine is different from the first machine, and the second authentication credentials are provided during a second session of use of the website through the second machine;
• cause the first machine to display a prompt for a linking instruction, the prompt being displayed in response to determining that the second authentication credentials match the first authentication credentials;
• send, based on a response to the prompt, a linking instruction to the second machine to link a display of second content of the website on the second machine to a display of first content of the website by the first machine;
• cause the first machine to display first content;
• receive a selection of a first portion of the first content displayed on the first machine, the first portion of the first content corresponding to a first item listing for a first item;
• cause the second machine to display the second content comprising a comparison table based on the selection, the comparison table comprising a plurality of item feature categories, the comparison table listing a first item attribute for the first item in a first item feature category of the plurality of item feature categories and a second item attribute for a second item in the first item feature category, wherein the second item differs from the first item;
• and
• cause the first machine to display an indicator associated with the first item listing, wherein the indicator comprises an indication that one or more item features associated with the first item listing is displayed in the comparison table at the second machine.

A non-transitory, computer-readable medium storing computer executable instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising:

• receiving, from a first machine, first authentication credentials including a user identifier used to authenticate a user, the first authentication credentials being provided during a first session of use of a website through the first machine;
• determining whether second authentication credentials received from a second machine match the first authentication credentials, wherein the second machine is different from the first machine, and the second authentication credentials are provided during a second session of use of the website through the second machine;
• causing the first machine to display a prompt for a linking instruction, the prompt being displayed in response to determining that the second authentication credentials match the first authentication credentials;
• sending, based on a response to the prompt, a linking instruction to the second machine to link a display of second content of the website on the second machine to a display of first content of the website by the first machine;
• causing the first machine to display the first content;
• receiving a selection of a first portion of the first content displayed on the first machine, the first portion of the first content corresponding to a first item listing for a first item;
• causing the second machine to display the second content comprising a comparison table based on the selection, the comparison table comprising a plurality of item feature categories, the comparison table listing a first item attribute for the first item in a first item feature category of the plurality of item feature categories and a second item attribute for a second item in the first item feature category, wherein the second item differs from the first item;
• and
• causing the first machine to display an indicator associated with the first item listing, wherein the indicator comprises an indication that one or more item features associated with the first item listing is displayed in the comparison table at the second machine.