diff --git a/platforms/macos/Sources/AppState+PortOperations.swift b/platforms/macos/Sources/AppState+PortOperations.swift
index 55e5912..cee7481 100644
--- a/platforms/macos/Sources/AppState+PortOperations.swift
+++ b/platforms/macos/Sources/AppState+PortOperations.swift
@@ -16,9 +16,15 @@ extension AppState {
             isScanning = true
 
             let scanned = await scanner.scanPorts()
+            let previousPorts = ports
             let didChange = updatePorts(scanned)
             didChangeAny = didChangeAny || didChange
 
+            // Check process type notifications for newly appeared ports
+            if didChange {
+                checkProcessTypeNotifications(oldPorts: previousPorts, newPorts: scanned)
+            }
+
             // Always update watcher state to keep transition baseline accurate.
             checkWatchedPorts()
             isScanning = false
diff --git a/platforms/macos/Sources/AppState+ProcessTypeNotifications.swift b/platforms/macos/Sources/AppState+ProcessTypeNotifications.swift
new file mode 100644
index 0000000..39a706e
--- /dev/null
+++ b/platforms/macos/Sources/AppState+ProcessTypeNotifications.swift
@@ -0,0 +1,24 @@
+import Foundation
+import Defaults
+
+extension AppState {
+    /// Checks for new ports matching enabled process type notifications.
+    /// Call after each scan to detect newly appeared ports.
+    func checkProcessTypeNotifications(oldPorts: [PortInfo], newPorts: [PortInfo]) {
+        let enabledTypes = Defaults[.notifyProcessTypes]
+        guard !enabledTypes.isEmpty else { return }
+
+        let oldPortPids = Set(oldPorts.map { "\($0.port)-\($0.pid)" })
+
+        for port in newPorts {
+            let key = "\(port.port)-\(port.pid)"
+            guard !oldPortPids.contains(key) else { continue }
+            guard enabledTypes.contains(port.processType.rawValue) else { continue }
+
+            NotificationService.shared.notify(
+                title: "New \(port.processType.rawValue) on Port \(port.port)",
+                body: "\(port.processName) started listening."
+            )
+        }
+    }
+}
diff --git a/platforms/macos/Sources/AppState.swift b/platforms/macos/Sources/AppState.swift
index 2d106cf..589cb72 100644
--- a/platforms/macos/Sources/AppState.swift
+++ b/platforms/macos/Sources/AppState.swift
@@ -20,6 +20,9 @@ extension Defaults.Keys {
     // Port labels (port number string → custom name)
     static let portLabels = Key<[String: String]>("portLabels", default: [:])
 
+    // Process type notification filters (rawValues of enabled types, empty = disabled)
+    static let notifyProcessTypes = Key<Set<String>>("notifyProcessTypes", default: [])
+
     // Kubernetes-related keys
     static let customNamespaces = Key<[String]>("customNamespaces", default: [])
 
diff --git a/platforms/macos/Sources/Views/Settings/NotificationsSettingsSection.swift b/platforms/macos/Sources/Views/Settings/NotificationsSettingsSection.swift
new file mode 100644
index 0000000..f087a2e
--- /dev/null
+++ b/platforms/macos/Sources/Views/Settings/NotificationsSettingsSection.swift
@@ -0,0 +1,49 @@
+import SwiftUI
+import Defaults
+
+struct NotificationsSettingsSection: View {
+    @Default(.notifyProcessTypes) private var enabledTypes
+
+    var body: some View {
+        SettingsGroup("Port Notifications", icon: "bell.fill") {
+            VStack(spacing: 0) {
+                SettingsRowContainer {
+                    VStack(alignment: .leading, spacing: 2) {
+                        Text("Notify on new ports by process type")
+                            .fontWeight(.medium)
+                        Text("Get notified when a port opens for selected process types")
+                            .font(.caption)
+                            .foregroundStyle(.secondary)
+                    }
+                }
+
+                ForEach(ProcessType.allCases) { type in
+                    SettingsDivider()
+                    processTypeToggle(type)
+                }
+            }
+        }
+    }
+
+    private func processTypeToggle(_ type: ProcessType) -> some View {
+        SettingsRowContainer {
+            Toggle(isOn: Binding(
+                get: { enabledTypes.contains(type.rawValue) },
+                set: { enabled in
+                    if enabled {
+                        Defaults[.notifyProcessTypes].insert(type.rawValue)
+                    } else {
+                        Defaults[.notifyProcessTypes].remove(type.rawValue)
+                    }
+                }
+            )) {
+                HStack(spacing: 8) {
+                    Image(systemName: type.icon)
+                        .foregroundStyle(type.color)
+                        .frame(width: 20)
+                    Text(type.rawValue)
+                }
+            }
+        }
+    }
+}
diff --git a/platforms/macos/Sources/Views/Settings/SettingsView.swift b/platforms/macos/Sources/Views/Settings/SettingsView.swift
index 0a3d0ff..a615156 100644
--- a/platforms/macos/Sources/Views/Settings/SettingsView.swift
+++ b/platforms/macos/Sources/Views/Settings/SettingsView.swift
@@ -36,6 +36,9 @@ struct SettingsView: View {
                 // MARK: - Port Forwarding
                 PortForwardingSettingsSection()
 
+                // MARK: - Notifications
+                NotificationsSettingsSection()
+
                 // MARK: - Cloudflare Tunnels
                 CloudflaredSettingsSection()