diff --git a/cidre/pomace/ui/ui.h b/cidre/pomace/ui/ui.h
index a5d86cb9..f6322a04 100644
--- a/cidre/pomace/ui/ui.h
+++ b/cidre/pomace/ui/ui.h
@@ -10,7 +10,9 @@
 NS_ASSUME_NONNULL_BEGIN
 
 Class UI_DEVICE;
+Class UI_APPLICATION;
 Class UI_VIEW;
+Class UI_WINDOW;
 Class UI_SCENE;
 Class UI_SCENE_CONFIGURATION;
 Class UI_COLOR;
@@ -32,8 +34,10 @@ static void ui_initializer(void)
         UI_VIEW = NSClassFromString(@"UIView");
         UI_SCENE_CONFIGURATION = NSClassFromString(@"UISceneConfiguration");
         UI_COLOR = [UIColor class];
-        UI_RESPONDER = NSClassFromString(@"UIResponder");//[UIResponder class];
-        UI_VIEW_CONTROLLER = NSClassFromString(@"UIViewController");//[UIViewController class];
+        UI_RESPONDER = NSClassFromString(@"UIResponder");
+        UI_VIEW_CONTROLLER = NSClassFromString(@"UIViewController");
+        UI_APPLICATION = NSClassFromString(@"UIApplication");
+        UI_WINDOW = NSClassFromString(@"UIWindow");
         UI_IMAGE = [UIImage class];
         
         NS_TEXT_ATTACHMENT = [NSTextAttachment class];
diff --git a/cidre/src/ui.rs b/cidre/src/ui.rs
index 8d9d19d5..cf3115ac 100644
--- a/cidre/src/ui.rs
+++ b/cidre/src/ui.rs
@@ -1,3 +1,8 @@
+mod application;
+pub use application::App;
+pub use application::AppDelegate;
+pub use application::AppDelegateImpl;
+
 mod device;
 pub use device::notifications as device_notifications;
 pub use device::BatteryState as DeviceBatteryState;
@@ -5,11 +10,14 @@ pub use device::Device;
 pub use device::Orientation as DeviceOrientation;
 pub use device::UserInterfaceIdiom;
 
+mod responder;
+pub use responder::Responder;
+
 mod view;
 pub use view::View;
 
-mod responder;
-pub use responder::Responder;
+mod window;
+pub use window::Window;
 
 mod view_controller;
 pub use view_controller::ViewController;
@@ -40,6 +48,11 @@ pub use scene_session::SceneSession;
 mod scene_options;
 pub use scene_options::SceneConnectionOpts;
 
+mod window_scene;
+pub use window_scene::WindowScene;
+pub use window_scene::WindowSceneDelegate;
+pub use window_scene::WindowSceneDelegateImpl;
+
 pub fn app_main(
     principal_class_name: Option<&crate::ns::String>,
     delegate_class_name: Option<&crate::ns::String>,
diff --git a/cidre/src/ui/application.rs b/cidre/src/ui/application.rs
new file mode 100644
index 00000000..7359692e
--- /dev/null
+++ b/cidre/src/ui/application.rs
@@ -0,0 +1,19 @@
+use crate::{arc, define_obj_type, objc, ui};
+
+#[objc::protocol(UIApplication)]
+pub trait AppDelegate {
+    #[objc::optional]
+    #[objc::msg_send(applicationDidFinishLaunching:)]
+    fn app_did_finish_launching(&mut self, app: &App);
+}
+
+define_obj_type!(
+    pub App(ui::Responder),
+    UI_APPLICATION
+);
+
+impl App {}
+
+extern "C" {
+    static UI_APPLICATION: &'static objc::Class<App>;
+}
diff --git a/cidre/src/ui/scene.rs b/cidre/src/ui/scene.rs
index 418dc518..f83f9097 100644
--- a/cidre/src/ui/scene.rs
+++ b/cidre/src/ui/scene.rs
@@ -1,4 +1,4 @@
-use crate::{arc, define_cls, define_obj_type, ns, objc, ui};
+use crate::{define_cls, define_obj_type, ns, objc, ui};
 
 define_obj_type!(
     pub Scene(ui::Responder)
diff --git a/cidre/src/ui/window.rs b/cidre/src/ui/window.rs
new file mode 100644
index 00000000..1f0327f1
--- /dev/null
+++ b/cidre/src/ui/window.rs
@@ -0,0 +1,19 @@
+use crate::{arc, define_obj_type, objc, ui};
+
+define_obj_type!(
+    pub Window(ui::View),
+    UI_WINDOW
+);
+
+impl Window {
+    #[objc::msg_send(rootViewController)]
+    pub fn root_vc(&self) -> Option<&ui::ViewController>;
+
+    #[objc::msg_send(setRootViewController:)]
+    pub fn set_root_vc(&mut self, val: Option<&ui::ViewController>);
+}
+
+#[link(name = "ui", kind = "static")]
+extern "C" {
+    static UI_WINDOW: &'static objc::Class<Window>;
+}
diff --git a/cidre/src/ui/window_scene.rs b/cidre/src/ui/window_scene.rs
new file mode 100644
index 00000000..6a78339e
--- /dev/null
+++ b/cidre/src/ui/window_scene.rs
@@ -0,0 +1,14 @@
+use crate::{define_obj_type, objc, ui};
+
+define_obj_type!(
+    pub WindowScene(ui::Scene)
+);
+
+#[objc::protocol(UIWindowSceneDelegate)]
+pub trait WindowSceneDelegate {
+    #[objc::msg_send(window)]
+    fn window(&self) -> Option<&ui::Window>;
+
+    #[objc::msg_send(setWindow:)]
+    fn set_window(&mut self, val: Option<&ui::Window>);
+}