diff --git a/gotify_tray/gui/MainApplication.py b/gotify_tray/gui/MainApplication.py
index 3df6d56..52030fb 100644
--- a/gotify_tray/gui/MainApplication.py
+++ b/gotify_tray/gui/MainApplication.py
@@ -266,6 +266,10 @@ class MainApplication(QtWidgets.QApplication):
     def new_message_callback(self, message: gotify.GotifyMessageModel):
         self.add_message_to_model(message)
 
+        # Change the tray icon to show there are unread notifications
+        if not self.main_window.isActiveWindow():
+            self.tray.set_icon_unread()
+
         # Show a notification
         if (
             message.priority < settings.value("tray/notifications/priority", type=int)
@@ -385,6 +389,7 @@ class MainApplication(QtWidgets.QApplication):
         self.main_window.delete_message.connect(self.delete_message_callback)
         self.main_window.image_popup.connect(self.image_popup_callback)
         self.main_window.hidden.connect(self.main_window_hidden_callback)
+        self.main_window.activated.connect(self.tray.revert_icon)
 
         self.watchdog.closed.connect(lambda: self.listener_closed_callback(None, None))
 
diff --git a/gotify_tray/gui/images/tray-unread-macos.png b/gotify_tray/gui/images/tray-unread-macos.png
new file mode 100644
index 0000000..f9edb2c
Binary files /dev/null and b/gotify_tray/gui/images/tray-unread-macos.png differ
diff --git a/gotify_tray/gui/images/tray-unread.png b/gotify_tray/gui/images/tray-unread.png
new file mode 100644
index 0000000..5d397d7
Binary files /dev/null and b/gotify_tray/gui/images/tray-unread.png differ
diff --git a/gotify_tray/gui/widgets/MainWindow.py b/gotify_tray/gui/widgets/MainWindow.py
index 0992c38..683f2a4 100644
--- a/gotify_tray/gui/widgets/MainWindow.py
+++ b/gotify_tray/gui/widgets/MainWindow.py
@@ -23,12 +23,15 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
     application_selection_changed = QtCore.pyqtSignal(QtGui.QStandardItem)
     image_popup = QtCore.pyqtSignal(str, QtCore.QPoint)
     hidden = QtCore.pyqtSignal()
+    activated = QtCore.pyqtSignal()
 
     def __init__(
         self, application_model: ApplicationModel, messages_model: MessagesModel
     ):
         super(MainWindow, self).__init__()
         self.setupUi(self)
+        
+        self.installEventFilter(self)
 
         self.setWindowTitle(__title__)
 
@@ -177,3 +180,9 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
     def closeEvent(self, e: QtGui.QCloseEvent) -> None:
         self.hide()
         self.hidden.emit()
+
+    def eventFilter(self, object: QtCore.QObject, event: QtCore.QEvent) -> bool:
+        if event.type() == QtCore.QEvent.Type.WindowActivate:
+            self.activated.emit()
+
+        return super().eventFilter(object, event)
diff --git a/gotify_tray/gui/widgets/Tray.py b/gotify_tray/gui/widgets/Tray.py
index 6339d0c..ab77124 100644
--- a/gotify_tray/gui/widgets/Tray.py
+++ b/gotify_tray/gui/widgets/Tray.py
@@ -44,7 +44,18 @@ class Tray(QtWidgets.QSystemTrayIcon):
         self.setContextMenu(menu)
 
     def set_icon_ok(self):
+        self.icon_error = False
         self.setIcon(QtGui.QIcon(get_icon("tray")))
 
     def set_icon_error(self):
+        self.icon_error = True
         self.setIcon(QtGui.QIcon(get_icon("tray-error")))
+
+    def set_icon_unread(self):
+        self.setIcon(QtGui.QIcon(get_icon("tray-unread")))
+
+    def revert_icon(self):
+        if self.icon_error:
+            self.set_icon_error()
+        else:
+            self.set_icon_ok()