diff --git a/src/Tools/tim_tool/Cargo.toml b/src/Tools/tim_tool/Cargo.toml
index 4db563ea..c695b90c 100644
--- a/src/Tools/tim_tool/Cargo.toml
+++ b/src/Tools/tim_tool/Cargo.toml
@@ -7,3 +7,7 @@ edition = "2021"
 panic = "abort"
 
 [dependencies]
+slint = "1.9.2"
+
+[build-dependencies]
+slint-build = "1.9.2"
diff --git a/src/Tools/tim_tool/build.rs b/src/Tools/tim_tool/build.rs
new file mode 100644
index 00000000..9bc30378
--- /dev/null
+++ b/src/Tools/tim_tool/build.rs
@@ -0,0 +1,3 @@
+fn main() {
+    slint_build::compile("ui/app-window.slint").expect("Slint build failed");
+}
diff --git a/src/Tools/tim_tool/src/main.rs b/src/Tools/tim_tool/src/main.rs
index 41bf1c4d..d065a6de 100644
--- a/src/Tools/tim_tool/src/main.rs
+++ b/src/Tools/tim_tool/src/main.rs
@@ -1,3 +1,22 @@
-fn main() {
-    tim_tool::hello_world();
-}
\ No newline at end of file
+// Prevent console window in addition to Slint window in Windows release builds when, e.g., starting the app via file manager. Ignored on other platforms.
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
+
+use std::error::Error;
+
+slint::include_modules!();
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let ui = AppWindow::new()?;
+
+    ui.on_request_increase_value({
+        let ui_handle = ui.as_weak();
+        move || {
+            let ui = ui_handle.unwrap();
+            ui.set_counter(ui.get_counter() + 1);
+        }
+    });
+
+    ui.run()?;
+
+    Ok(())
+}
diff --git a/src/Tools/tim_tool/ui/app-window.slint b/src/Tools/tim_tool/ui/app-window.slint
new file mode 100644
index 00000000..a2cb9238
--- /dev/null
+++ b/src/Tools/tim_tool/ui/app-window.slint
@@ -0,0 +1,19 @@
+import { Button, VerticalBox } from "std-widgets.slint";
+
+export component AppWindow inherits Window {
+    in-out property <int> counter: 42;
+    callback request-increase-value();
+    VerticalBox {
+        Text {
+            text: "Counter: \{root.counter}";
+        }
+
+        Button {
+            checked: false;
+            text: "Increase value";
+            clicked => {
+                root.request-increase-value();
+            }
+        }
+    }
+}