diff --git a/web-portal/client/novnc_oio/vnc.html b/web-portal/client/novnc_oio/vnc.html
index 4ae487f..52bd846 100644
--- a/web-portal/client/novnc_oio/vnc.html
+++ b/web-portal/client/novnc_oio/vnc.html
@@ -57,6 +57,18 @@
 
     <script src="app/error-handler.js"></script>
     <script type="module" crossorigin="anonymous" src="app/ui.js"></script>
+
+    <!-- Google Analytics -->
+
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-JXK20KN1W1"></script>
+    <script>
+        window.dataLayer = window.dataLayer || [];
+        function gtag(){dataLayer.push(arguments);}
+        gtag('js', new Date());
+
+        gtag('config', 'G-JXK20KN1W1');
+    </script>
+
     
     <!-- Interlisp Online -->
     <link rel="stylesheet" href="oio/dialog.css">
diff --git a/web-portal/client/views/layout.pug b/web-portal/client/views/layout.pug
index 20ebdad..b11a59f 100644
--- a/web-portal/client/views/layout.pug
+++ b/web-portal/client/views/layout.pug
@@ -47,6 +47,14 @@ html(lang="en")
             document.querySelectorAll('dialog').forEach(dialogEl => dialogPolyfill.registerDialog(dialogEl));
         });
 
+    //  Google tag (gtag.js)
+    script(async='' src="https://www.googletagmanager.com/gtag/js?id=G-JXK20KN1W1")
+    script.
+        window.dataLayer = window.dataLayer || [];
+        function gtag(){dataLayer.push(arguments);}
+        gtag('js', new Date());
+        gtag('config', 'G-JXK20KN1W1');
+
     script. 
         var targetSystem = "#{targetSystem}";
         var $buoop = {