diff --git a/.gitignore b/.gitignore
index 0d7684f2..5cb60826 100644
--- a/.gitignore
+++ b/.gitignore
@@ -58,3 +58,6 @@ Thumbs.db
 .secrets/
 libraries/plugins/src/plugins.ts
 i18n.cache
+
+# Generated by apps/frontend/scripts/fetch-gtm.mjs on install
+apps/frontend/public/g.js
diff --git a/apps/frontend/package.json b/apps/frontend/package.json
index 85f5f408..4e92b3ca 100644
--- a/apps/frontend/package.json
+++ b/apps/frontend/package.json
@@ -5,6 +5,8 @@
   "type": "module",
   "scripts": {
     "dev": "dotenv -e ../../.env -- next dev -p 4200",
+    "fetch-gtm": "node scripts/fetch-gtm.mjs",
+    "postinstall": "node scripts/fetch-gtm.mjs",
     "build": "next build",
     "build:sentry": "dotenv -e ../../.env -- next build",
     "start": "dotenv -e ../../.env -- next start -p 4200",
diff --git a/apps/frontend/scripts/fetch-gtm.mjs b/apps/frontend/scripts/fetch-gtm.mjs
new file mode 100644
index 00000000..d1465c1b
--- /dev/null
+++ b/apps/frontend/scripts/fetch-gtm.mjs
@@ -0,0 +1,50 @@
+import { writeFile, mkdir, readFile } from 'node:fs/promises';
+import { existsSync } from 'node:fs';
+import { dirname, resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const envPath = resolve(__dirname, '..', '..', '..', '.env');
+const outPath = resolve(__dirname, '..', 'public', 'g.js');
+
+if (!process.env.NEXT_PUBLIC_GTM_ID && existsSync(envPath)) {
+  const content = await readFile(envPath, 'utf8');
+  for (const raw of content.split('\n')) {
+    const line = raw.trim();
+    if (!line || line.startsWith('#')) continue;
+    const eq = line.indexOf('=');
+    if (eq === -1) continue;
+    const key = line.slice(0, eq).trim();
+    let value = line.slice(eq + 1).trim();
+    if (
+      (value.startsWith('"') && value.endsWith('"')) ||
+      (value.startsWith("'") && value.endsWith("'"))
+    ) {
+      value = value.slice(1, -1);
+    }
+    if (!process.env[key]) process.env[key] = value;
+  }
+}
+
+const id = process.env.NEXT_PUBLIC_GTM_ID;
+if (!id) {
+  console.log('[fetch-gtm] NEXT_PUBLIC_GTM_ID not set, skipping');
+  process.exit(0);
+}
+
+const url = `https://www.googletagmanager.com/gtm.js?id=${encodeURIComponent(id)}`;
+try {
+  console.log(`[fetch-gtm] fetching ${url}`);
+  const res = await fetch(url);
+  if (!res.ok) {
+    console.warn(`[fetch-gtm] non-OK response ${res.status}, skipping`);
+    process.exit(0);
+  }
+  const body = await res.text();
+  await mkdir(dirname(outPath), { recursive: true });
+  await writeFile(outPath, body, 'utf8');
+  console.log(`[fetch-gtm] wrote ${outPath} (${body.length} bytes)`);
+} catch (err) {
+  console.warn(`[fetch-gtm] failed: ${err?.message || err}, skipping`);
+  process.exit(0);
+}
diff --git a/apps/frontend/src/app/(app)/layout.tsx b/apps/frontend/src/app/(app)/layout.tsx
index dedbbf09..eaa4aebe 100644
--- a/apps/frontend/src/app/(app)/layout.tsx
+++ b/apps/frontend/src/app/(app)/layout.tsx
@@ -15,6 +15,7 @@ import { PHProvider } from '@gitroom/react/helpers/posthog';
 import UtmSaver from '@gitroom/helpers/utils/utm.saver';
 import { DubAnalytics } from '@gitroom/frontend/components/layout/dubAnalytics';
 import { FacebookComponent } from '@gitroom/frontend/components/layout/facebook.component';
+import { GoogleTagManagerComponent } from '@gitroom/frontend/components/layout/gtm.component';
 import { cookies } from 'next/headers';
 import {
   cookieName,
@@ -96,6 +97,7 @@ export default async function AppLayout({ children }: { children: ReactNode }) {
             <HtmlComponent />
             <DubAnalytics />
             <FacebookComponent />
+            <GoogleTagManagerComponent gtmId={process.env.NEXT_PUBLIC_GTM_ID} />
             <Plausible
               domain={!!process.env.IS_GENERAL ? 'postiz.com' : 'gitroom.com'}
             >
diff --git a/apps/frontend/src/components/layout/gtm.component.tsx b/apps/frontend/src/components/layout/gtm.component.tsx
new file mode 100644
index 00000000..900228e9
--- /dev/null
+++ b/apps/frontend/src/components/layout/gtm.component.tsx
@@ -0,0 +1,21 @@
+'use client';
+
+import Script from 'next/script';
+import { FC } from 'react';
+
+export const GoogleTagManagerComponent: FC<{ gtmId?: string }> = ({
+  gtmId,
+}) => {
+  if (!gtmId) {
+    return null;
+  }
+  return (
+    <Script strategy="afterInteractive" id="gtm">
+      {`(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
+new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
+j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
+'/g.js?id='+i+dl;f.parentNode.insertBefore(j,f);
+})(window,document,'script','dataLayer','${gtmId}');`}
+    </Script>
+  );
+};
diff --git a/apps/frontend/src/components/onboarding/onboarding.tsx b/apps/frontend/src/components/onboarding/onboarding.tsx
index fe6d39c3..3e7da8f7 100644
--- a/apps/frontend/src/components/onboarding/onboarding.tsx
+++ b/apps/frontend/src/components/onboarding/onboarding.tsx
@@ -27,6 +27,17 @@ export const Onboarding: FC = () => {
       }
       return;
     }
+    if (typeof window !== 'undefined') {
+      const check = query.get('check') || 'unknown';
+      const key = `gtm_start_trial_${check}`;
+      if (!sessionStorage.getItem(key)) {
+        sessionStorage.setItem(key, '1');
+        // @ts-ignore
+        window.dataLayer = window.dataLayer || [];
+        // @ts-ignore
+        window.dataLayer.push({ event: 'start_trial', check });
+      }
+    }
     if (modalOpen.current) {
       return;
     }