Tuesday, April 2, 2013 | 9:30 AMWith Google+ Sign-In, users can sign in to your Android, iOS and web apps using their existing Google credentials, and bring along their Google+ info for an upgraded experience. We already provide APKs and APIs that you can build directly into your apps. Hundreds of thousands of developers already use the user management and social infrastructure platforms Janrain and Gigya to manage their sign-in systems. Today we're happy to announce that both companies are including Google+ Sign-In as part of their product suites! This means that their customers will be able to:Add trusted authentication to their apps and sitesAllow web users to automatically download their Android appCustomize their app experience using Google+ profile infoEnable users to share interactive posts with friendsWrite app activities that only appear when they're relevantPosted by Seth Sternberg , Director of Product Management, Google+