Systems, methods, and computer-readable media for communications between applications in a mobile operating system. A first application may receive a request for data from a second application. The first application may generate a first URL to the second application, a parameter of the first URL comprising an identifier of the first application. A mobile operating system may access the first URL to open the second application. The second application may validate credentials for an account and initiate a server on a port. The second application may generate a second URL to the first application, a parameter of the second URL comprising the port. The operating system may access the second URL to open the first application. The first application may establish a connection with the server using the port specified in the second URL and receive data from the second application via the connection with the server.