CrossCloud is a single client application for multiple cloud storage services like Dropbox or Google Drive. It enables users to unite their different cloud storages in one client application and seamlessly collaborate on data with others on different platforms when focusing on very high simplicity and security of files in the cloud. Per default, CrossCloud takes care of the distribution of files among the different accounts for the user when paying attention to preferences. So using multiple accounts becomes as simple as using one. If users want to define where certain files or folders are synced to, they can easily define rules and CrossCloud distributes them accordingly. With client side encryption and encrypted sharing of data CrossCloud provides security of all files in the cloud with almost no usability drawbacks to the user.