diff --git a/app/layout.tsx b/app/layout.tsx
index 5ff1925..c2ba73f 100644
--- a/app/layout.tsx
+++ b/app/layout.tsx
@@ -4,29 +4,37 @@ import {
   SkipLink,
   ThemeColorSync,
 } from "@/support/theme";
-import { INDEXABLE_ROBOTS } from "@hraness/web-discovery";
 import { JsonLdScript } from "@hraness/web-discovery/json-ld";
 import type { Metadata, Viewport } from "next";
 import type { ReactNode } from "react";
 import "./globals.css";
 import { PostHogAnalytics } from "./posthog-analytics";
 import { websiteJsonLd } from "./seo";
-import { SITE_ORIGIN, site, socialMetadata } from "./site";
+import { SITE_ORIGIN, site } from "./site";
 
 export const metadata: Metadata = {
   metadataBase: new URL(SITE_ORIGIN),
   title: {
-    default: site.title,
+    default: site.applicationName,
     template: site.titleTemplate,
   },
-  description: site.description,
   applicationName: site.applicationName,
-  alternates: {
-    canonical: "/",
-  },
   formatDetection: { address: false, email: false, telephone: false },
-  robots: INDEXABLE_ROBOTS,
-  ...socialMetadata(site.title, site.description, "/"),
+  openGraph: {
+    type: "website",
+    locale: "en_US",
+    siteName: site.name,
+    images: [{
+      alt: site.socialImageAlt,
+      height: 630,
+      url: "/opengraph-image",
+      width: 1200,
+    }],
+  },
+  twitter: {
+    card: "summary_large_image",
+    images: [{ alt: site.socialImageAlt, url: "/opengraph-image" }],
+  },
 };
 
 export const viewport: Viewport = {
diff --git a/app/metadata.test.ts b/app/metadata.test.ts
index ff1fd06..3656664 100644
--- a/app/metadata.test.ts
+++ b/app/metadata.test.ts
@@ -53,10 +53,9 @@ describe("stripehistory.com public identity", () => {
       },
       sitemap: `${SITE_ORIGIN}/sitemap.xml`,
     });
-    expect(metadata.robots).toMatchObject({ index: true, follow: true });
   });
 
-  test("keeps canonical metadata on stripehistory.com", () => {
+  test("keeps only site-wide defaults that other routes can inherit", () => {
     expect(robots()).toMatchObject({ host: SITE_ORIGIN });
     expect(manifest()).toMatchObject({
       description: site.description,
@@ -68,14 +67,26 @@ describe("stripehistory.com public identity", () => {
     expect(new URL(metadata.metadataBase ?? "https://invalid.example").origin).toBe(
       SITE_ORIGIN,
     );
-    expect(metadata.alternates).toEqual({ canonical: "/" });
-    expect(metadata.title).toEqual({
-      default: site.title,
-      template: site.titleTemplate,
+    expect(metadata).toMatchObject({
+      applicationName: site.applicationName,
+      title: {
+        default: site.applicationName,
+        template: site.titleTemplate,
+      },
+      openGraph: {
+        locale: "en_US",
+        siteName: site.name,
+        type: "website",
+      },
     });
-    expect(metadata.description).toBe(site.description);
-    expect(metadata.openGraph?.title).toBe(site.title);
-    expect(metadata.twitter?.title).toBe(site.title);
+    expect(metadata).not.toHaveProperty("description");
+    expect(metadata).not.toHaveProperty("robots");
+    expect(metadata.alternates).toBeUndefined();
+    expect(metadata.openGraph).not.toHaveProperty("url");
+    expect(metadata.openGraph).not.toHaveProperty("title");
+    expect(metadata.openGraph).not.toHaveProperty("description");
+    expect(metadata.twitter).not.toHaveProperty("title");
+    expect(metadata.twitter).not.toHaveProperty("description");
     expect(socialImageAlt).toBe(site.socialImageAlt);
   });
 
diff --git a/app/not-found.test.ts b/app/not-found.test.ts
new file mode 100644
index 0000000..fd6659a
--- /dev/null
+++ b/app/not-found.test.ts
@@ -0,0 +1,16 @@
+import { describe, expect, test } from "bun:test";
+import { NOINDEX_ROBOTS } from "@hraness/web-discovery";
+
+import { metadata } from "./not-found";
+
+describe("stripehistory.com not-found metadata", () => {
+  test("uses a distinct noindex page instead of the homepage identity", () => {
+    expect(metadata).toEqual({
+      title: "Page not found",
+      description: "The requested Stripe history page does not exist.",
+      robots: NOINDEX_ROBOTS,
+    });
+    expect(metadata.alternates).toBeUndefined();
+    expect(metadata.openGraph).toBeUndefined();
+  });
+});
diff --git a/app/not-found.tsx b/app/not-found.tsx
index 63b9e27..a551848 100644
--- a/app/not-found.tsx
+++ b/app/not-found.tsx
@@ -1,15 +1,26 @@
+import { NOINDEX_ROBOTS } from "@hraness/web-discovery";
+import type { Metadata } from "next";
 import Link from "next/link";
 
 import { SiteFooter } from "./site-footer";
 import { SiteHeader } from "./site-header";
 
+const notFoundTitle = "Page not found";
+const notFoundDescription = "The requested Stripe history page does not exist.";
+
+export const metadata: Metadata = {
+  title: notFoundTitle,
+  description: notFoundDescription,
+  robots: NOINDEX_ROBOTS,
+};
+
 export default function NotFound() {
   return (
     <main className="plain-page stripe-history-main stripe-history-state" id="main-content">
       <SiteHeader />
       <section aria-labelledby="not-found-heading" className="stripe-history-section">
-        <h1 id="not-found-heading">Page not found</h1>
-        <p>The requested Stripe history page does not exist.</p>
+        <h1 id="not-found-heading">{notFoundTitle}</h1>
+        <p>{notFoundDescription}</p>
         <p><Link href="/">Browse Stripe company history</Link></p>
       </section>
       <SiteFooter />
diff --git a/app/page.test.tsx b/app/page.test.tsx
index 0d85dff..5853b7b 100644
--- a/app/page.test.tsx
+++ b/app/page.test.tsx
@@ -1,8 +1,10 @@
 import { describe, expect, test } from "bun:test";
+import { INDEXABLE_ROBOTS } from "@hraness/web-discovery";
 import { loadHistory } from "@/lib/content";
 import { renderToStaticMarkup } from "react-dom/server";
 
 import Home, { generateMetadata } from "./page";
+import { site } from "./site";
 
 describe("canonical stripehistory.com history", () => {
   test("publishes root-canonical history metadata", async () => {
@@ -12,6 +14,8 @@ describe("canonical stripehistory.com history", () => {
 
     expect(metadata).toMatchObject({
       alternates: { canonical: "/" },
+      description: site.description,
+      robots: INDEXABLE_ROBOTS,
       title: expectedTitle,
     });
     expect(metadata.openGraph).toMatchObject({
diff --git a/app/page.tsx b/app/page.tsx
index b263cd3..b6bbee4 100644
--- a/app/page.tsx
+++ b/app/page.tsx
@@ -1,4 +1,5 @@
 import { loadHistory } from "@/lib/content";
+import { INDEXABLE_ROBOTS } from "@hraness/web-discovery";
 import { JsonLdScript } from "@hraness/web-discovery/json-ld";
 import type { Metadata } from "next";
 
@@ -19,6 +20,7 @@ export async function generateMetadata(): Promise<Metadata> {
     title,
     description: site.description,
     alternates: { canonical: "/" },
+    robots: INDEXABLE_ROBOTS,
     ...socialMetadata(`${title} | ${site.domain}`, site.description, "/"),
   };
 }