diff --git a/defos/src/defos_mac.mm b/defos/src/defos_mac.mm
index 033bb3c..21f921c 100644
--- a/defos/src/defos_mac.mm
+++ b/defos/src/defos_mac.mm
@@ -93,7 +93,16 @@ void defos_toggle_fullscreen() {
 }
 
 void defos_toggle_borderless() {
-    // TODO: add defos_toggle_borderless for Mac
+    if (!window) return;
+
+    NSUInteger currentStyleMask = [window styleMask];
+    if (currentStyleMask == NSWindowStyleMaskBorderless) {
+        [window setStyleMask:NSWindowStyleMaskTitled | NSWindowStyleMaskResizable | NSWindowStyleMaskClosable | NSWindowStyleMaskMiniaturizable];
+    } else {
+        [window setStyleMask:NSWindowStyleMaskBorderless];
+    }
+
+    [window makeKeyAndOrderFront:nil];
 }
 
 void defos_toggle_maximized() {
@@ -122,8 +131,9 @@ bool defos_is_fullscreen() {
 }
 
 bool defos_is_borderless() {
-    // TODO: add defos_is_borderless for Mac
-    return true;
+    if (!window) return false;
+    NSUInteger currentStyleMask = [window styleMask];
+    return currentStyleMask == NSWindowStyleMaskBorderless;
 }
 
 bool defos_is_maximized() {
diff --git a/example/example.gui b/example/example.gui
index a856c05..18fea8d 100644
--- a/example/example.gui
+++ b/example/example.gui
@@ -10,7 +10,7 @@ textures {
 nodes {
   position {
     x: 525.0
-    y: 104.0
+    y: 141.0
   }
   scale {
     x: 0.7
@@ -36,7 +36,7 @@ nodes {
 nodes {
   position {
     x: 525.0
-    y: 69.0
+    y: 106.0
   }
   scale {
     x: 0.7
@@ -406,7 +406,7 @@ nodes {
 nodes {
   position {
     x: 525.0
-    y: 174.0
+    y: 211.0
   }
   scale {
     x: 0.7
@@ -431,7 +431,7 @@ nodes {
 nodes {
   position {
     x: 525.0
-    y: 34.0
+    y: 71.0
   }
   scale {
     x: 0.7
@@ -561,7 +561,7 @@ nodes {
 nodes {
   position {
     x: 525.0
-    y: 139.0
+    y: 176.0
   }
   scale {
     x: 0.7
@@ -682,7 +682,7 @@ nodes {
 nodes {
   position {
     x: 525.0
-    y: 209.0
+    y: 246.0
   }
   scale {
     x: 0.7
@@ -769,4 +769,29 @@ nodes {
   overridden_fields: 18
   template_node_child: true
 }
+nodes {
+  position {
+    x: 525.0
+    y: 33.0
+  }
+  scale {
+    x: 0.7
+    y: 0.7
+  }
+  size {
+    x: 450.0
+    y: 100.0
+  }
+  type: TYPE_TEXT
+  text: "is_mouse_in_view"
+  font: "larryfont"
+  id: "is_borderless"
+  pivot: PIVOT_NW
+  shadow {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+  }
+  inherit_alpha: true
+}
 material: "/builtins/materials/gui.material"
diff --git a/example/example.gui_script b/example/example.gui_script
index 5b44e15..c04294f 100644
--- a/example/example.gui_script
+++ b/example/example.gui_script
@@ -152,6 +152,7 @@ function update(self, dt)
 	gui.set_text(gui.get_node("is_fullscreen"),"is_fullscreen "..tostring(defos.is_fullscreen()))
 	gui.set_text(gui.get_node("is_maximized"),"is_maximized "..tostring(defos.is_maximized()))
 	gui.set_text(gui.get_node("is_mouse_in_view"),"is_mouse_in_view "..tostring(defos.is_mouse_in_view()))
+	gui.set_text(gui.get_node("is_borderless"),"is_borderless "..tostring(defos.is_borderless()))
 end
 
 function update_clipping_label(self)
@@ -198,7 +199,7 @@ function on_input(self, action_id, action)
 	end)
 
 	dirtylarry:button("toggle_borderless", action_id, action, function ()
-		if system_name == "Windows" then
+		if system_name == "Windows" or system_name == "Darwin" then
 			defos.toggle_borderless()
 		end
 	end)