diff --git a/components/hooks/useHasAccount.ts b/components/hooks/useHasAccount.ts
new file mode 100644
index 0000000000..6ed6635315
--- /dev/null
+++ b/components/hooks/useHasAccount.ts
@@ -0,0 +1,20 @@
+import { useState, useEffect } from 'react'
+import Cookies from 'js-cookie'
+
+// Measure if the user has a github.com account and signed in during this session.
+// The github.com sends the color_mode cookie every request when you sign in,
+// but does not delete the color_mode cookie on sign out.
+// You do not need to change your color mode settings to get this cookie,
+// this applies to every user regardless of if they changed this setting.
+// To test this, try a private browser tab.
+// We are using the color_mode cookie because it is not HttpOnly.
+export function useHasAccount() {
+  const [hasAccount, setHasAccount] = useState<boolean | null>(null)
+
+  useEffect(() => {
+    const cookieValue = Cookies.get('color_mode')
+    setHasAccount(Boolean(cookieValue))
+  }, [])
+
+  return { hasAccount }
+}
diff --git a/components/hooks/useSession.ts b/components/hooks/useSession.ts
index 1ea66391d8..38d17de698 100644
--- a/components/hooks/useSession.ts
+++ b/components/hooks/useSession.ts
@@ -10,7 +10,6 @@ export default async function fetcher<JSON = any>(
 }
 
 export type Session = {
-  isSignedIn: boolean
   csrfToken?: string
 }
 
diff --git a/components/page-header/Header.tsx b/components/page-header/Header.tsx
index 9e2f848791..09b8c1c0f3 100644
--- a/components/page-header/Header.tsx
+++ b/components/page-header/Header.tsx
@@ -6,7 +6,7 @@ import { useVersion } from 'components/hooks/useVersion'
 
 import { Link } from 'components/Link'
 import { useMainContext } from 'components/context/MainContext'
-import { useSession } from 'components/hooks/useSession'
+import { useHasAccount } from 'components/hooks/useHasAccount'
 import { LanguagePicker } from './LanguagePicker'
 import { HeaderNotifications } from 'components/page-header/HeaderNotifications'
 import { ProductPicker } from 'components/page-header/ProductPicker'
@@ -26,11 +26,10 @@ export const Header = () => {
   )
   const [scroll, setScroll] = useState(false)
 
-  const { session } = useSession()
+  const { hasAccount } = useHasAccount()
 
   const signupCTAVisible =
-    session &&
-    !session.isSignedIn &&
+    hasAccount === false && // don't show if `null`
     (currentVersion === 'free-pro-team@latest' || currentVersion === 'enterprise-cloud@latest')
 
   useEffect(() => {
diff --git a/middleware/api/session.js b/middleware/api/session.js
index 057b69c545..4d83e01c26 100644
--- a/middleware/api/session.js
+++ b/middleware/api/session.js
@@ -6,10 +6,7 @@ const noCacheControl = cacheControlFactory(0)
 
 router.get('/', (req, res) => {
   noCacheControl(res)
-  res.json({
-    isSignedIn: Boolean(req.cookies?.dotcom_user),
-    csrfToken: req.csrfToken?.() || '',
-  })
+  res.json({ csrfToken: req.csrfToken?.() || '' })
 })
 
 export default router