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Google’s Flutter is a cross-platform toolkit developed by MobiDev. The toolkit is based on the reactive programming that supposes streams. Flutter apps are not affected by any OS update or system customization. The Hot Reload Reload feature works on a virtual machine, and then Flutter compiles the code and reloaded the code into a Dart code. It means that animations and screen scrolls will work smoothly, while data is loaded from the server. It is the best fit for apps with complex architecture and significant amount of data.