Disclosed are various examples of systems and methods for transferring data between applications executing in sandboxed environments. In one example, a first application is in a first sandbox. A request for access to data is transmitted from the first application to a second application in a second sandbox. The data is stored in the second sandbox. The request is transmitted using a sandbox communications framework. The data is received using the sandbox communications framework. The data is encrypted. An encryption key is retrieved from an access-restricted data store.