Review of Apache Usergrid powered by the Slant community.
The BaaS Framework you run
Build Apps not Servers! Whether you need to support one App or a hundred, Usergrid is your backend. As easy as a LAMP stack, but built for mobile. Get Apps to production in record time and stop wasting cycles writing server-side code.
Complete SDKs for iOS, Android, HTML5/JS, Node.js, Ruby, Java, .NET, and PHP. Open source since 2011.
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Pros
Pro Multiple SDKs
Usergrid has full SDKs for iOS, Android, and HTML5/JS but also node.js, Ruby on Rails, pure pure Ruby, server-side Java, .NET / Windows and PHP.