diff --git a/shared/static/scripts/sx-browser.js b/shared/static/scripts/sx-browser.js
index 3214d2e..9282400 100644
--- a/shared/static/scripts/sx-browser.js
+++ b/shared/static/scripts/sx-browser.js
@@ -14,6 +14,7 @@
   // =========================================================================
 
   var NIL = Object.freeze({ _nil: true, toString: function() { return "nil"; } });
+  var SX_VERSION = "2026-03-06T21:05:23Z";
 
   function isNil(x) { return x === NIL || x === null || x === undefined; }
   function isSxTruthy(x) { return x !== false && !isNil(x); }
@@ -2349,7 +2350,7 @@ callExpr.push(dictGet(kwargs, k)); } }
 })(); };
 
   // boot-init
-  var bootInit = function() { return (initCssTracking(), initStyleDict(), processSxScripts(NIL), processPageScripts(), sxHydrateElements(NIL), processElements(NIL)); };
+  var bootInit = function() { return (logInfo((String("sx-browser ") + String(SX_VERSION))), initCssTracking(), initStyleDict(), processSxScripts(NIL), processPageScripts(), sxHydrateElements(NIL), processElements(NIL)); };
 
 
   // =========================================================================
diff --git a/shared/sx/ref/boot.sx b/shared/sx/ref/boot.sx
index 41e7fec..0e95e85 100644
--- a/shared/sx/ref/boot.sx
+++ b/shared/sx/ref/boot.sx
@@ -336,6 +336,7 @@
     ;; 5. Hydrate [data-sx] elements
     ;; 6. Process engine elements
     (do
+      (log-info (str "sx-browser " SX_VERSION))
       (init-css-tracking)
       (init-style-dict)
       (process-sx-scripts nil)
diff --git a/shared/sx/ref/bootstrap_js.py b/shared/sx/ref/bootstrap_js.py
index c63e54e..f39c979 100644
--- a/shared/sx/ref/bootstrap_js.py
+++ b/shared/sx/ref/bootstrap_js.py
@@ -476,6 +476,7 @@ class JSEmitter:
             "process-sx-scripts": "processSxScripts",
             "process-component-script": "processComponentScript",
             "init-style-dict": "initStyleDict",
+            "SX_VERSION": "SX_VERSION",
             "boot-init": "bootInit",
             "resolve-mount-target": "resolveMountTarget",
             "sx-render-with-env": "sxRenderWithEnv",
@@ -1288,7 +1289,9 @@ def compile_ref_to_js(
         parts.append(CONTINUATIONS_JS)
     parts.append(public_api_js(has_html, has_sx, has_dom, has_engine, has_orch, has_cssx, has_boot, has_parser, adapter_label, has_deps, has_router))
     parts.append(EPILOGUE)
-    return "\n".join(parts)
+    from datetime import datetime, timezone
+    build_ts = datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
+    return "\n".join(parts).replace("BUILD_TIMESTAMP", build_ts)
 
 
 # ---------------------------------------------------------------------------
@@ -1312,6 +1315,7 @@ PREAMBLE = '''\
   // =========================================================================
 
   var NIL = Object.freeze({ _nil: true, toString: function() { return "nil"; } });
+  var SX_VERSION = "BUILD_TIMESTAMP";
 
   function isNil(x) { return x === NIL || x === null || x === undefined; }
   function isSxTruthy(x) { return x !== false && !isNil(x); }