API Reference > imodeljs-frontend > IModelApp IModelApp Classes for configuring and administering an iModel.js application. See the learning articles. Classes Name Description IModelApp Global singleton that connects the user interface with the iModel.js services. Enumerations Name Description WebGLFeature Describes the required and optional WebGL features used by the RenderSystem. Beta WebGLRenderCompatibilityStatus Describes the state of render compatibility. Beta Interfaces Name Description IModelAppOptions Options that can be supplied to IModelApp.startup to customize frontend behavior. WebGLRenderCompatibilityInfo WebGL rendering compatibility information returned by IModelApp.queryRenderCompatibility. Beta Last Updated: 13 June, 2024