Matching and attribution of user device events

A system comprising:

• one or more storage devices configured to store:
• a first data object that includes a first device identifier (ID) and web browser metadata that are associated with selection of a website link in a web browser application on a user device;
• and
• a second data object that includes a second device ID and device metadata that are associated with an installed application on the user device, wherein the second data object is associated with an application open event generated by the installed application in response to opening of the installed application;
• and
• one or more processing units that execute computer-readable instructions that cause the one or more processing units to:
• determine a matching score based on the web browser metadata and the device metadata, wherein the matching score indicates that the first device ID and the second device ID are likely associated with the user device;
• store the matching score in the one or more storage devices;
• receive web event data from the user device, the web event data generated in response to a user browser action on the web browser application, wherein the web event data includes the first device ID;
• receive app event data generated by the installed application, wherein the app event data includes the second device ID, and wherein the app event data indicates that a partner-defined action has been performed by a user in the installed application;
• attribute the partner-defined action to the user browser action and selection of the website link in response to receiving the app event data and determining the stored matching score indicates that the first and second device IDs are likely associated with the user device;
• and
• transmit attribution data to a partner computing device, the attribution data indicating that the partner-defined action is attributed to the user browser action and the selection of the website link.