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QuickBlox is a cloud-hosted backend platform providing communications functionality - chat, video calling, voice chat, presence and notifications - for mobile applications. QuickBlox also provides modules to power other app features - users, location, content and ratings. Quickblox is amongst the only platforms providing native video and voice calling SDKs for Android and iOS. All our other modules - text & group chat, presence, notifications, user, location, content and ratings - work across all platforms including Web, Windows Phone, and Blackberry. Our SDKs are free to download and use for developers, with no usage limits. For professionals and enterprises requiring higher quality of service, SLAs and support, we provide premium, paid packages including integration assistance.