Grow your audience across devices
Simple, secure authentication
Improve registration and sign-in conversion with a fast and secure authentication option for users.
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Interactive posts
Help your users prompt friends to take specific actions in your app from a Google+ post.
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Over-the-air installs
Let web users instantly download and install your app to their Android device.
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Integrated Hangouts
Build collaborative Hangout Apps that bring people together in new ways.
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Profile & social graph access
Show relevant content and connections from circles and profile information.
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Lasting re-engagement
App activities can help you re-engage users when it's relevant in the future.
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Engagement analytics
Tune your performance with stats on downloads, signed-in users, and their activity.
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Google+ Sign-In: Boost engagement & installs
Learn how Google+ Sign-In provides a simple, trusted, and secure experience for your users.
Get inspired
Explore examples of some apps and websites that use Google+ Sign-In.
PhotoHunt sample app
Learn how to create a simple scavenger hunt application that lets users hunt for photos matching the topic of the day. You'll see how easy it is to sign in with Google+, share interactive posts, personalize an app, and install a mobile app over-the-air.
Languages
PhotoHunt for Java
PhotoHunt for Android
PhotoHunt for Objective-C / iOS
PhotoHunt for .NET
PhotoHunt for Python
PhotoHunt for Ruby
PhotoHunt for PHP (soon)
PhotoHunt for Go (soon)