diff --git a/index.html b/index.html
index 2004557..0078906 100644
--- a/index.html
+++ b/index.html
@@ -441,7 +441,9 @@
     <script src="lib/cornerstone-base64-image-loader.umd.js"></script>
     <script src="lib/dexie.js"></script>
     <script src="lib/jquery.modal.min.js"></script>
+    <script src="https://browser.sentry-cdn.com/8.48.0/bundle.min.js" crossorigin="anonymous"></script>
     <!-- <script src="packets/rr1" defer="defer"></script> -->
+
     <script src="js/main.js" defer="defer" type="module"></script>
     <script src="lib/notify.min.js" type="text/javascript"></script>
 
diff --git a/js/main.js b/js/main.js
index f9cf338..6f25a9e 100644
--- a/js/main.js
+++ b/js/main.js
@@ -5,6 +5,10 @@ import * as interact from "./interact.js";
 import * as config from "./config.js";
 import { db, question_db } from "./db.js";
 import { initSync, triggerImmediateSync, updateSyncUI } from "./sync.js";
+import { initSentry } from "./sentry.js";
+
+initSentry();
+
 // const { v4: uuidv4 } = require('uuid');
 
 function initLogging() {
diff --git a/js/sentry.js b/js/sentry.js
new file mode 100644
index 0000000..034c04d
--- /dev/null
+++ b/js/sentry.js
@@ -0,0 +1,46 @@
+/**
+ * Sentry Error Monitoring initializer for RTS.
+ *
+ * Configurable via window.SENTRY_DSN or window.RTS_SENTRY_DSN or <meta name="sentry-dsn" content="...">
+ */
+
+export function initSentry() {
+  try {
+    const metaDsn = document.querySelector('meta[name="sentry-dsn"]')?.getAttribute('content');
+    const dsn = window.SENTRY_DSN || window.RTS_SENTRY_DSN || metaDsn;
+
+    if (!dsn) {
+      return;
+    }
+
+    if (window.Sentry) {
+      window.Sentry.init({
+        dsn: dsn,
+        environment: window.SENTRY_ENVIRONMENT || 'production',
+        tracesSampleRate: parseFloat(window.SENTRY_TRACES_SAMPLE_RATE || '0.05'),
+        integrations: [
+          window.Sentry.browserTracingIntegration ? window.Sentry.browserTracingIntegration() : null
+        ].filter(Boolean)
+      });
+      console.log("[RTS] Sentry error monitoring initialized");
+    } else {
+      // Dynamically load Sentry bundle if DSN is set but Sentry library tag isn't explicitly loaded
+      const script = document.createElement('script');
+      script.src = 'https://browser.sentry-cdn.com/8.48.0/bundle.min.js';
+      script.crossOrigin = 'anonymous';
+      script.onload = () => {
+        if (window.Sentry) {
+          window.Sentry.init({
+            dsn: dsn,
+            environment: window.SENTRY_ENVIRONMENT || 'production',
+            tracesSampleRate: parseFloat(window.SENTRY_TRACES_SAMPLE_RATE || '0.05')
+          });
+          console.log("[RTS] Sentry error monitoring initialized via dynamic load");
+        }
+      };
+      document.head.appendChild(script);
+    }
+  } catch (err) {
+    console.warn("[RTS] Sentry initialization failed:", err);
+  }
+}