diff --git a/crates/composition/src/builder.rs b/crates/composition/src/builder.rs
index 572fcc9..b65cdc4 100644
--- a/crates/composition/src/builder.rs
+++ b/crates/composition/src/builder.rs
@@ -1,5 +1,5 @@
 use crate::Result;
-use crate::system::WindowingSystem;
+use crate::system::App;
 use layer_shika_adapters::platform::slint_interpreter::{CompilationResult, Compiler};
 use layer_shika_domain::errors::DomainError;
 use layer_shika_domain::prelude::{
@@ -194,7 +194,7 @@ impl LayerShika<HasComponent> {
         self
     }
 
-    pub fn build(self) -> Result<WindowingSystem> {
+    pub fn build(self) -> Result<App> {
         let component_definition = self
             .state
             .compilation_result
@@ -206,10 +206,15 @@ impl LayerShika<HasComponent> {
                 ),
             })?;
 
-        WindowingSystem::new(
+        App::new(
             component_definition,
             Some(self.state.compilation_result),
             self.config,
         )
     }
+
+    pub fn run(self) -> Result<()> {
+        let mut app = self.build()?;
+        app.run()
+    }
 }
diff --git a/crates/composition/src/lib.rs b/crates/composition/src/lib.rs
index eda2851..71ba8df 100644
--- a/crates/composition/src/lib.rs
+++ b/crates/composition/src/lib.rs
@@ -23,7 +23,7 @@ pub use layer_shika_domain::value_objects::popup_request::{
     PopupAt, PopupHandle, PopupRequest, PopupSize,
 };
 pub use slint_callbacks::{SlintCallbackContract, SlintCallbackNames};
-pub use system::{EventLoopHandle, ShellContext, WindowingSystem};
+pub use system::{App, EventLoopHandle, ShellContext};
 
 pub mod calloop {
     pub use layer_shika_adapters::platform::calloop::{
@@ -41,6 +41,19 @@ pub enum Error {
     #[error("Domain error: {0}")]
     Domain(#[from] DomainError),
 
-    #[error("WindowingSystem has been dropped")]
+    #[error("App has been dropped")]
     SystemDropped,
 }
+
+pub mod prelude {
+    pub use crate::{
+        AnchorEdges, App, EventLoopHandle, KeyboardInteractivity, Layer, LayerShika,
+        OutputGeometry, OutputHandle, OutputInfo, OutputPolicy, OutputRegistry, PopupAt,
+        PopupHandle, PopupPositioningMode, PopupRequest, PopupSize, PopupWindow, Result,
+        ShellContext, SlintCallbackContract, SlintCallbackNames,
+    };
+
+    pub use crate::calloop::{Generic, Interest, Mode, PostAction, RegistrationToken, Timer};
+
+    pub use crate::{slint, slint_interpreter};
+}
diff --git a/crates/composition/src/system.rs b/crates/composition/src/system.rs
index 64c50af..9e346b0 100644
--- a/crates/composition/src/system.rs
+++ b/crates/composition/src/system.rs
@@ -391,13 +391,13 @@ impl ShellContext<'_> {
     }
 }
 
-pub struct WindowingSystem {
+pub struct App {
     inner: Rc<RefCell<WindowingSystemFacade>>,
     popup_command_sender: channel::Sender<PopupCommand>,
     callback_contract: SlintCallbackContract,
 }
 
-impl WindowingSystem {
+impl App {
     pub(crate) fn new(
         component_definition: ComponentDefinition,
         compilation_result: Option<Rc<CompilationResult>>,
diff --git a/src/lib.rs b/src/lib.rs
index 6379415..2b8b26a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -22,14 +22,11 @@
 //! ```rust,no_run
 //! use layer_shika::prelude::*;
 //!
-//! let system = LayerShika::from_file("ui/main.slint", Some("AppWindow"))?
+//! LayerShika::from_file("ui/main.slint", Some("AppWindow"))?
 //!     .with_height(42)
 //!     .with_anchor(AnchorEdges::top_bar())
 //!     .with_exclusive_zone(42)
-//!     .build()?;
-//!
-//! let mut system = system;
-//! system.run()?;
+//!     .run()?;
 //! # Ok::<(), layer_shika::Error>(())
 //! ```
 //!
@@ -45,10 +42,10 @@
 pub mod prelude;
 
 pub use layer_shika_composition::{
-    AnchorEdges, Error, EventLoopHandle, KeyboardInteractivity, Layer, LayerShika, OutputGeometry,
-    OutputHandle, OutputInfo, OutputPolicy, OutputRegistry, PopupAt, PopupHandle, PopupPositioningMode,
-    PopupRequest, PopupSize, PopupWindow, Result, ShellContext, SlintCallbackContract,
-    SlintCallbackNames, WindowingSystem,
+    AnchorEdges, App, Error, EventLoopHandle, KeyboardInteractivity, Layer, LayerShika,
+    OutputGeometry, OutputHandle, OutputInfo, OutputPolicy, OutputRegistry, PopupAt, PopupHandle,
+    PopupPositioningMode, PopupRequest, PopupSize, PopupWindow, Result, ShellContext,
+    SlintCallbackContract, SlintCallbackNames,
 };
 
 pub use layer_shika_composition::{slint, slint_interpreter};
diff --git a/src/prelude.rs b/src/prelude.rs
index a275cdb..1eaca8b 100644
--- a/src/prelude.rs
+++ b/src/prelude.rs
@@ -10,14 +10,15 @@
 
 // Core API types
 pub use crate::{
-    Error, EventLoopHandle, LayerShika, PopupWindow, Result, ShellContext, SlintCallbackContract,
-    SlintCallbackNames, WindowingSystem,
+    App, Error, EventLoopHandle, LayerShika, PopupWindow, Result, ShellContext,
+    SlintCallbackContract, SlintCallbackNames,
 };
 
 // Domain value objects
 pub use crate::{
     AnchorEdges, KeyboardInteractivity, Layer, OutputGeometry, OutputHandle, OutputInfo,
-    OutputPolicy, OutputRegistry, PopupAt, PopupHandle, PopupPositioningMode, PopupRequest, PopupSize,
+    OutputPolicy, OutputRegistry, PopupAt, PopupHandle, PopupPositioningMode, PopupRequest,
+    PopupSize,
 };
 
 // Event loop types