Systems and methods for hosted applications

A computing device configured to execute a hosted application, comprising:

• a processor and storage, where an operating system is installed on the computing device that configures the processor to create a computing environment;
• an application platform application stored in the storage of the computing device, where the application platform application comprises:
• a rendering engine process;
• and
• an integration process
• at least one hosted application comprising a background page file including instructions;
• wherein the rendering engine process is configured to parse the instructions contained within the background page file to configure the processor to:
• download at least one remotely hosted file containing instructions in the rendering language for rendering a web page;
• build a document object model (DOM) based on at least the instructions in the at least one remotely hosted file;
• and
• wherein the rendering engine process is configured to render a user interface page integrated into the computing environment of the operating system of the computing device based on the DOM;
• and
• wherein the integration process:
• enables communication with the operating system to modify the computing environment in response to API calls;
• integrates the user interface page with functionalities of the computing device.