Techniques are described herein that provide for inter-domain communications with one or more shared worker applications. A parent web application associated with a first domain may create a child web application associated with a second domain different than the first domain. The child web application may determine whether a shared worker associated with the second domain is operating. The shared worker acquires information associated with the second domain in response to one or more requests, and stores acquired information associated with the second domain in a memory of the local computing device. The parent web application may request, via the child web application, information associated with the second domain from the shared worker. In response to the request, the parent web application may receive, from the shared worker, information associated with the second domain stored in the memory of the local computing device.