diff --git a/cpu_monitor_gui.py b/cpu_monitor_gui.py
index a333cd9..ed4227c 100755
--- a/cpu_monitor_gui.py
+++ b/cpu_monitor_gui.py
@@ -3,10 +3,24 @@
 
 import tkinter as tk
 from tkinter import ttk
+import subprocess
+import tempfile
+import os
 import time
+import sys
+import gi
 
 import psutil
 
+gi.require_version('Gtk', '3.0')
+gi.require_version('AyatanaAppIndicator3', '0.1')
+from gi.repository import AyatanaAppIndicator3, GLib, Gtk
+
+
+MAX_POINTS = 60
+UPDATE_INTERVAL = 1000  # ms
+
+
 try:
     from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
     from matplotlib.figure import Figure
@@ -15,10 +29,6 @@ except ImportError:
     HAVE_MPL = False
 
 
-MAX_POINTS = 60
-UPDATE_INTERVAL = 1000  # ms
-
-
 class Tracker:
     def __init__(self):
         self.cpu_data = []
@@ -29,6 +39,99 @@ class Tracker:
         return psutil.cpu_percent(interval=None)
 
 
+class SysTrayIndicator:
+    def __init__(self, monitor):
+        self.indicator = AyatanaAppIndicator3.Indicator.new(
+            "cpu-monitor",
+            "utilities-system-monitor",
+            AyatanaAppIndicator3.IndicatorCategory.SYSTEM_SERVICES
+        )
+        self.indicator.set_status(AyatanaAppIndicator3.IndicatorStatus.ACTIVE)
+        self.indicator.set_menu(self._create_menu())
+        self.monitor = monitor
+        self._update_icon()
+
+    def _create_menu(self):
+        menu = Gtk.Menu()
+        cpu = psutil.cpu_percent(interval=None)
+        ram = psutil.virtual_memory().percent
+        disk = psutil.disk_usage('/').percent
+
+        item1 = Gtk.MenuItem(label=f"CPU: {cpu:.1f}%")
+        item1.show()
+        menu.append(item1)
+
+        item2 = Gtk.MenuItem(label=f"RAM: {ram:.1f}%")
+        item2.show()
+        menu.append(item2)
+
+        item3 = Gtk.MenuItem(label=f"Disk: {disk:.1f}%")
+        item3.show()
+        menu.append(item3)
+
+        sep = Gtk.SeparatorMenuItem()
+        sep.show()
+        menu.append(sep)
+
+        hide = Gtk.MenuItem(label="Hide Window")
+        hide.connect("activate", lambda w: self.monitor.root.withdraw())
+        hide.show()
+        menu.append(hide)
+
+        show = Gtk.MenuItem(label="Show Window")
+        show.connect("activate", lambda w: self.monitor.root.deiconify())
+        show.show()
+        menu.append(show)
+
+        sep2 = Gtk.SeparatorMenuItem()
+        sep2.show()
+        menu.append(sep2)
+
+        quit_item = Gtk.MenuItem(label="Quit")
+        quit_item.connect("activate", lambda w: self._quit())
+        quit_item.show()
+        menu.append(quit_item)
+
+        menu.show()
+        return menu
+
+    def _quit(self):
+        GLib.idle_add(Gtk.main_quit)
+        sys.exit(0)
+
+    def _update_icon(self):
+        try:
+            import cairo
+        except ImportError:
+            GLib.timeout_add_seconds(1, self._update_icon)
+            return
+
+        cpu = psutil.cpu_percent()
+        if cpu > 80:
+            color = (0.93, 0.33, 0.31)
+        elif cpu > 50:
+            color = (1.0, 0.55, 0.0)
+        else:
+            color = (0.40, 0.76, 0.97)
+
+        size = 24
+        surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, size, size)
+        cr = cairo.Context(surface)
+        cr.set_source_rgba(*color, 1.0)
+        cr.paint()
+
+        tmp = tempfile.NamedTemporaryFile(suffix='.png', delete=False, dir='/tmp')
+        tmp.close()
+        surface.write_to_png(tmp.name)
+
+        try:
+            self.indicator.set_icon_full(tmp.name, "CPU Monitor")
+        except Exception:
+            pass
+
+        GLib.timeout_add_seconds(2, self._update_icon)
+
+
 class App:
     cpu_data = []
     ram_data = []
@@ -184,12 +287,15 @@ class App:
     def _stop(self):
         self._running = False
         self.status_label.config(text="Stopped.")
-        self.root.destroy()
+        self.root.withdraw()
 
 
 def main():
     root = tk.Tk()
     app = App(root)
+
+    _tray = SysTrayIndicator(app)
+
     root.mainloop()
 
 
diff --git a/debian/changelog b/debian/changelog
old mode 100644
new mode 100755
index 32bc293..acf84b7
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,7 @@
-cpu-monitor (1.2) noble; urgency=low
+cpu-monitor (1.4) noble; urgency=low
 
-  * Removed AppIndicator (Wayland incompatible)
-  * Simpler, more reliable autostart
+  * v1.4: Add working AppIndicator systray with GTK3
+  * v1.4: System tray icon with CPU/RAM/Disk status menu
+  * v1.4: Hide/Show window from systray menu
 
  -- tmzf5455 <tmzf5455>  Sun, 10 May 2026 00:00:00 +0000
diff --git a/debian/control b/debian/control
old mode 100644
new mode 100755
index 7408072..3c48dd8
--- a/debian/control
+++ b/debian/control
@@ -8,7 +8,7 @@ Rules-Requires-Root: no
 
 Package: cpu-monitor
 Architecture: all
-Depends: python3, python3-psutil, python3-matplotlib, python3-tk, ${misc:Depends}
+Depends: python3, python3-psutil, python3-matplotlib, python3-tk, gir1.2-ayatanaappindicator3-0.1, gir1.2-gtk-3.0, ${misc:Depends}
 Description: CPU/RAM/Disk/Network monitor GUI
  A system monitor tool with real-time matplotlib charts
  and a tkinter GUI, showing CPU, RAM, disk and network usage.
diff --git a/debian/source/format b/debian/source/format
old mode 100644
new mode 100755