Systems and methods for sharing authentication between applications include receiving a request to share authentication from a first application with a second application. An account identifier and identity token for a user are obtained from the first application. Access to a communication application associated with the account identifier is verified as available. The account identifier and identity token are sent to a second application server for verification with a first application server. A verification message is received in the communication application from the second application server. The verification message is determined to contain confirmation information and authentication is shared from the first application with the second application. Related systems and methods include retrieving information associated with an operating system to facilitate sharing authentication between applications.