diff --git a/app/app.vue b/app/app.vue
index 71844c0..967eb08 100644
--- a/app/app.vue
+++ b/app/app.vue
@@ -5,7 +5,7 @@
   </v-app>
 </template>
 <script setup lang="ts">
-import { computed, onMounted, watch } from 'vue';
+import { computed, onBeforeUnmount, onMounted, watch } from 'vue';
 import { useHotjar, useRoute, useState } from '#imports';
 import { useAuthStore } from '~/stores/auth';
 import { HOTJAR_LOCAL_STORAGE_KEY, useCookieConsent } from '~/composables/useCookieConsent';
@@ -26,6 +26,7 @@ const authStore = useAuthStore();
 const { hasConsent, analyticsEnabled } = useCookieConsent();
 const { initialize } = useHotjar();
 const hotjarInitialized = useState('hotjar-initialized', () => false);
+const productSession = useState<{ product: 'classroom' | 'liveatc'; path: string; startedAt: number } | null>('product-usage-session', () => null);
 
 const showCookieBanner = computed(() => {
   if (!authStore.isAuthenticated) {
@@ -76,6 +77,74 @@ const scheduleHotjarInitialization = () => {
   }, HOTJAR_INIT_DELAY);
 };
 
+const resolveTrackedProduct = (path: string): 'classroom' | 'liveatc' | null => {
+  if (path.startsWith('/classroom')) return 'classroom';
+  if (path.startsWith('/pm') || path.startsWith('/copilot') || path.startsWith('/bridge')) return 'liveatc';
+  return null;
+};
+
+const flushProductSession = () => {
+  if (typeof window === 'undefined' || !productSession.value) {
+    return;
+  }
+
+  const session = productSession.value;
+  productSession.value = null;
+  const endedAt = Date.now();
+  const durationSeconds = Math.round((endedAt - session.startedAt) / 1000);
+
+  if (durationSeconds < 5) {
+    return;
+  }
+
+  const headers: Record<string, string> = { 'Content-Type': 'application/json' };
+  if (authStore.accessToken) {
+    headers.Authorization = `Bearer ${authStore.accessToken}`;
+  }
+
+  fetch('/api/service/analytics/product-session', {
+    method: 'POST',
+    headers,
+    body: JSON.stringify({
+      product: session.product,
+      path: session.path,
+      durationSeconds,
+      startedAt: new Date(session.startedAt).toISOString(),
+      endedAt: new Date(endedAt).toISOString(),
+    }),
+    keepalive: true,
+  }).catch(() => undefined);
+};
+
+const syncProductSession = () => {
+  if (typeof window === 'undefined') {
+    return;
+  }
+
+  const product = authStore.isAuthenticated ? resolveTrackedProduct(route.path) : null;
+  const current = productSession.value;
+
+  if (current && (!product || current.product !== product || current.path !== route.path)) {
+    flushProductSession();
+  }
+
+  if (product && !productSession.value) {
+    productSession.value = {
+      product,
+      path: route.path,
+      startedAt: Date.now(),
+    };
+  }
+};
+
+const handleVisibilityChange = () => {
+  if (document.visibilityState === 'hidden') {
+    flushProductSession();
+  } else {
+    syncProductSession();
+  }
+};
+
 onMounted(() => {
   if (typeof window === 'undefined') {
     return;
@@ -111,5 +180,22 @@ onMounted(() => {
     },
     { immediate: true }
   );
+
+  watch(
+    [() => route.path, () => authStore.isAuthenticated],
+    () => syncProductSession(),
+    { immediate: true }
+  );
+
+  window.addEventListener('beforeunload', flushProductSession);
+  document.addEventListener('visibilitychange', handleVisibilityChange);
+});
+
+onBeforeUnmount(() => {
+  flushProductSession();
+  if (typeof window !== 'undefined') {
+    window.removeEventListener('beforeunload', flushProductSession);
+    document.removeEventListener('visibilitychange', handleVisibilityChange);
+  }
 });
 </script>
diff --git a/server/models/ProductUsageSession.ts b/server/models/ProductUsageSession.ts
new file mode 100644
index 0000000..4175d8e
--- /dev/null
+++ b/server/models/ProductUsageSession.ts
@@ -0,0 +1,27 @@
+import mongoose from 'mongoose'
+
+export type ProductUsageKey = 'classroom' | 'liveatc'
+
+export interface ProductUsageSessionDocument extends mongoose.Document {
+  user?: mongoose.Types.ObjectId
+  product: ProductUsageKey
+  path?: string
+  durationSeconds: number
+  startedAt: Date
+  endedAt: Date
+  createdAt: Date
+}
+
+const productUsageSessionSchema = new mongoose.Schema<ProductUsageSessionDocument>({
+  user: { type: mongoose.Schema.Types.ObjectId, ref: 'User', index: true },
+  product: { type: String, enum: ['classroom', 'liveatc'], required: true, index: true },
+  path: { type: String, trim: true },
+  durationSeconds: { type: Number, required: true, min: 0 },
+  startedAt: { type: Date, required: true },
+  endedAt: { type: Date, required: true, index: true },
+  createdAt: { type: Date, default: () => new Date() },
+})
+
+export const ProductUsageSession =
+  (mongoose.models.ProductUsageSession as mongoose.Model<ProductUsageSessionDocument> | undefined) ||
+  mongoose.model<ProductUsageSessionDocument>('ProductUsageSession', productUsageSessionSchema)