diff --git a/Downterm/Downterm.xcodeproj/project.pbxproj b/Downterm/Downterm.xcodeproj/project.pbxproj
index 912a38f..93e17ed 100644
--- a/Downterm/Downterm.xcodeproj/project.pbxproj
+++ b/Downterm/Downterm.xcodeproj/project.pbxproj
@@ -27,12 +27,14 @@
 		C4C93F2911B41BC19A2AE934 /* SettingsWindowController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0A973877BCE6084D0EBBBDBD /* SettingsWindowController.swift */; };
 		CC26C1677258E44F0D7B106A /* SwiftTermView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1E47000112562615C7E59489 /* SwiftTermView.swift */; };
 		E9A064422790735E033E534F /* TerminalManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = BA6843B571B41986DE386F5F /* TerminalManager.swift */; };
+		EA604F3F38D6638C7236CDC2 /* LaunchAtLoginHelper.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0B567F3B5D006D2B35630CFF /* LaunchAtLoginHelper.swift */; };
 		F0130A88D1453CD199FA65D7 /* NSScreen+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = F0CED6A0F25A6E57D8AA308A /* NSScreen+Extensions.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
 		02FEFF9074A85F02C43D9408 /* NotchWindow.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NotchWindow.swift; sourceTree = "<group>"; };
 		0A973877BCE6084D0EBBBDBD /* SettingsWindowController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingsWindowController.swift; sourceTree = "<group>"; };
+		0B567F3B5D006D2B35630CFF /* LaunchAtLoginHelper.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LaunchAtLoginHelper.swift; sourceTree = "<group>"; };
 		15A290D4D21D6C01A583A372 /* ScreenManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ScreenManager.swift; sourceTree = "<group>"; };
 		1E47000112562615C7E59489 /* SwiftTermView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SwiftTermView.swift; sourceTree = "<group>"; };
 		1FC09C538CBE7C2D072008B2 /* NotchShape.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NotchShape.swift; sourceTree = "<group>"; };
@@ -79,6 +81,7 @@
 			isa = PBXGroup;
 			children = (
 				3B72743F178231E0B06DD3DE /* HotkeyManager.swift */,
+				0B567F3B5D006D2B35630CFF /* LaunchAtLoginHelper.swift */,
 				EA1CD1DE020F0467AFB98DE3 /* PopoutWindowController.swift */,
 				15A290D4D21D6C01A583A372 /* ScreenManager.swift */,
 				0A973877BCE6084D0EBBBDBD /* SettingsWindowController.swift */,
@@ -223,6 +226,7 @@
 				88EBFBB2292659EA7C42A8F9 /* HotkeyBinding.swift in Sources */,
 				4D5125E11B4DDBDB3DFACBAF /* HotkeyManager.swift in Sources */,
 				7BD705CA6A34117929B362EC /* HotkeyRecorderView.swift in Sources */,
+				EA604F3F38D6638C7236CDC2 /* LaunchAtLoginHelper.swift in Sources */,
 				F0130A88D1453CD199FA65D7 /* NSScreen+Extensions.swift in Sources */,
 				2213F430F3D8A88033607CD2 /* NotchSettings.swift in Sources */,
 				4566E6B87CB62AF5C8D4B9D8 /* NotchShape.swift in Sources */,
diff --git a/Downterm/Downterm.xcodeproj/project.xcworkspace/xcuserdata/harvmaster.xcuserdatad/UserInterfaceState.xcuserstate b/Downterm/Downterm.xcodeproj/project.xcworkspace/xcuserdata/harvmaster.xcuserdatad/UserInterfaceState.xcuserstate
index 86a7023..3a96b67 100644
Binary files a/Downterm/Downterm.xcodeproj/project.xcworkspace/xcuserdata/harvmaster.xcuserdatad/UserInterfaceState.xcuserstate and b/Downterm/Downterm.xcodeproj/project.xcworkspace/xcuserdata/harvmaster.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/Downterm/Downterm/AppDelegate.swift b/Downterm/Downterm/AppDelegate.swift
index fe435ae..1b8a522 100644
--- a/Downterm/Downterm/AppDelegate.swift
+++ b/Downterm/Downterm/AppDelegate.swift
@@ -11,6 +11,10 @@ class AppDelegate: NSObject, NSApplicationDelegate {
         NotchSettings.registerDefaults()
         NSApp.setActivationPolicy(.accessory)
 
+        // Sync the launch-at-login toggle with the actual system state
+        // in case the user toggled it from System Settings.
+        UserDefaults.standard.set(LaunchAtLoginHelper.isEnabled, forKey: NotchSettings.Keys.launchAtLogin)
+
         ScreenManager.shared.start()
         observeDisplayPreference()
         observeSizePreferences()
diff --git a/Downterm/Downterm/Managers/LaunchAtLoginHelper.swift b/Downterm/Downterm/Managers/LaunchAtLoginHelper.swift
new file mode 100644
index 0000000..954b83f
--- /dev/null
+++ b/Downterm/Downterm/Managers/LaunchAtLoginHelper.swift
@@ -0,0 +1,24 @@
+import ServiceManagement
+
+/// Registers / unregisters the app as a login item using the
+/// modern SMAppService API (macOS 13+).
+enum LaunchAtLoginHelper {
+
+    static func setEnabled(_ enabled: Bool) {
+        let service = SMAppService.mainApp
+        do {
+            if enabled {
+                try service.register()
+            } else {
+                try service.unregister()
+            }
+        } catch {
+            print("[LaunchAtLogin] Failed to \(enabled ? "register" : "unregister"): \(error)")
+        }
+    }
+
+    /// Reads the current registration state from the system.
+    static var isEnabled: Bool {
+        SMAppService.mainApp.status == .enabled
+    }
+}
diff --git a/Downterm/Downterm/Models/NotchSettings.swift b/Downterm/Downterm/Models/NotchSettings.swift
index 869ecbc..e8c7d0b 100644
--- a/Downterm/Downterm/Models/NotchSettings.swift
+++ b/Downterm/Downterm/Models/NotchSettings.swift
@@ -9,6 +9,7 @@ enum NotchSettings {
         static let openNotchOnHover      = "openNotchOnHover"
         static let minimumHoverDuration  = "minimumHoverDuration"
         static let showMenuBarIcon       = "showMenuBarIcon"
+        static let launchAtLogin         = "launchAtLogin"
 
         // Sizing — closed state
         static let notchHeight           = "notchHeight"
@@ -58,6 +59,7 @@ enum NotchSettings {
         static let openNotchOnHover: Bool       = true
         static let minimumHoverDuration: Double = 0.3
         static let showMenuBarIcon: Bool        = true
+        static let launchAtLogin: Bool          = false
 
         static let notchHeight: Double          = 32
         static let nonNotchHeight: Double       = 32
@@ -102,6 +104,7 @@ enum NotchSettings {
             Keys.openNotchOnHover:      Defaults.openNotchOnHover,
             Keys.minimumHoverDuration:  Defaults.minimumHoverDuration,
             Keys.showMenuBarIcon:       Defaults.showMenuBarIcon,
+            Keys.launchAtLogin:         Defaults.launchAtLogin,
 
             Keys.notchHeight:           Defaults.notchHeight,
             Keys.nonNotchHeight:        Defaults.nonNotchHeight,
diff --git a/Downterm/Downterm/Views/SettingsView.swift b/Downterm/Downterm/Views/SettingsView.swift
index 3b8c2c5..2341edb 100644
--- a/Downterm/Downterm/Views/SettingsView.swift
+++ b/Downterm/Downterm/Views/SettingsView.swift
@@ -73,6 +73,7 @@ struct GeneralSettingsView: View {
     @AppStorage(NotchSettings.Keys.openNotchOnHover)     private var openNotchOnHover     = NotchSettings.Defaults.openNotchOnHover
     @AppStorage(NotchSettings.Keys.minimumHoverDuration) private var minimumHoverDuration = NotchSettings.Defaults.minimumHoverDuration
     @AppStorage(NotchSettings.Keys.showMenuBarIcon)      private var showMenuBarIcon      = NotchSettings.Defaults.showMenuBarIcon
+    @AppStorage(NotchSettings.Keys.launchAtLogin)        private var launchAtLogin        = NotchSettings.Defaults.launchAtLogin
     @AppStorage(NotchSettings.Keys.enableGestures)       private var enableGestures       = NotchSettings.Defaults.enableGestures
     @AppStorage(NotchSettings.Keys.gestureSensitivity)   private var gestureSensitivity   = NotchSettings.Defaults.gestureSensitivity
 
@@ -89,6 +90,10 @@ struct GeneralSettingsView: View {
             Section("Display") {
                 Toggle("Show on all displays", isOn: $showOnAllDisplays)
                 Toggle("Show menu bar icon", isOn: $showMenuBarIcon)
+                Toggle("Launch at login", isOn: $launchAtLogin)
+                    .onChange(of: launchAtLogin) { _, newValue in
+                        LaunchAtLoginHelper.setEnabled(newValue)
+                    }
             }
 
             Section("Hover Behavior") {