diff --git a/collection/app/home.css b/collection/app/home.css
index 2990501..df6b25a 100644
--- a/collection/app/home.css
+++ b/collection/app/home.css
@@ -250,6 +250,7 @@
 .frame-lockup {
   display: flex;
   flex-direction: column;
+  margin: 0;
   font-size: 2rem;
   line-height: 1;
 }
diff --git a/collection/app/page.tsx b/collection/app/page.tsx
index 909af65..50e067d 100644
--- a/collection/app/page.tsx
+++ b/collection/app/page.tsx
@@ -1,6 +1,7 @@
 import AppIndex from "@/components/AppIndex";
 import Footer from "@/components/Footer";
 import Hero from "@/components/Hero";
+import JsonLd from "@/components/JsonLd";
 import Manifesto from "@/components/Manifesto";
 import Nav from "@/components/Nav";
 import Rules from "@/components/Rules";
@@ -11,6 +12,7 @@ export default function Home() {
   // chrome to jump to, and <main> claimed the header and footer as content.
   return (
     <>
+      <JsonLd />
       <Nav />
       <main id="content">
         <Hero />
diff --git a/collection/app/robots.ts b/collection/app/robots.ts
deleted file mode 100644
index 60cca3b..0000000
--- a/collection/app/robots.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import type { MetadataRoute } from "next";
-
-export const dynamic = "force-static";
-
-export default function robots(): MetadataRoute.Robots {
-  return {
-    rules: {
-      userAgent: "*",
-      allow: "/",
-      disallow: "/thanks",
-    },
-    sitemap: "https://spiralcc.tech/sitemap.xml",
-  };
-}
diff --git a/collection/app/sitemap.ts b/collection/app/sitemap.ts
deleted file mode 100644
index a74670a..0000000
--- a/collection/app/sitemap.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-import type { MetadataRoute } from "next";
-
-export const dynamic = "force-static";
-
-export default function sitemap(): MetadataRoute.Sitemap {
-  const base = "https://spiralcc.tech";
-  const paths = [
-    "",
-    "/wallpaper/",
-    "/slim/",
-    "/clean/",
-    "/resume/",
-    "/privacy/",
-    "/work/",
-  ];
-  // No lastModified — `new Date()` would make every export look freshly
-  // updated and fight cache/CDN fingerprints for an otherwise static site.
-  return paths.map((path) => ({
-    url: `${base}${path}`,
-    changeFrequency: "weekly" as const,
-    priority: path === "" ? 1 : 0.7,
-  }));
-}
diff --git a/collection/components/AppIndex.tsx b/collection/components/AppIndex.tsx
index eeedb82..50d2379 100644
--- a/collection/components/AppIndex.tsx
+++ b/collection/components/AppIndex.tsx
@@ -49,10 +49,10 @@ export default function AppIndex() {
 
                   <span className="frame-name">
                     <Mark size={28} className="frame-mark" />
-                    <span className="type-heading frame-lockup">
+                    <h3 className="type-heading frame-lockup">
                       <span className="frame-lockup-collection">Spiral</span>
                       <span className="frame-lockup-app">{short}</span>
-                    </span>
+                    </h3>
                   </span>
 
                   <span className="frame-proof">{PROOF[app.slug] ?? app.tagline}</span>
diff --git a/collection/components/JsonLd.tsx b/collection/components/JsonLd.tsx
new file mode 100644
index 0000000..b07700b
--- /dev/null
+++ b/collection/components/JsonLd.tsx
@@ -0,0 +1,13 @@
+import { homeJsonLd } from "@/lib/jsonLd";
+
+/** Home-page JSON-LD. Escapes `<` so a future string cannot break the parser. */
+export default function JsonLd() {
+  const json = JSON.stringify(homeJsonLd()).replace(/</g, "\\u003c");
+  return (
+    <script
+      type="application/ld+json"
+      // biome-ignore lint/security/noDangerouslySetInnerHtml: static JSON-LD, no user input
+      dangerouslySetInnerHTML={{ __html: json }}
+    />
+  );
+}
diff --git a/collection/lib/jsonLd.ts b/collection/lib/jsonLd.ts
new file mode 100644
index 0000000..d1e1583
--- /dev/null
+++ b/collection/lib/jsonLd.ts
@@ -0,0 +1,106 @@
+/**
+ * JSON-LD for the home page. Every string is already on the site (layout
+ * metadata, the hero, the app catalogue, the rules board, or the manifesto).
+ * No ratings, review counts, or other figures we do not have.
+ */
+import { apps } from "@/lib/apps";
+import { WHOP_CHECKOUT_URL } from "@/lib/whop";
+
+const SITE = "https://spiralcc.tech";
+
+/** Same sentence as `app/layout.tsx` metadata.description. */
+const COLLECTION_DESCRIPTION =
+  "Spiral Collection — Wallpaper, Slim, and Resume. One $9.99 license. No telemetry, no background processes. Mac, and Windows where each app ships.";
+
+/**
+ * Live apps the home page and checkout actually sell. Clean has a page but
+ * is not released — it is not in this list and has no Offer.
+ */
+const LISTED = ["wallpaper", "slim", "resume"] as const;
+
+const OFFER = {
+  "@type": "Offer",
+  name: "Spiral Collection license",
+  description: "One $9.99 license. Unlocks Wallpaper, Slim, and Resume.",
+  price: "9.99",
+  priceCurrency: "USD",
+  url: WHOP_CHECKOUT_URL,
+  availability: "https://schema.org/InStock",
+};
+
+function operatingSystem(slug: string): string {
+  // Slim's only shipped binary is the macOS wizard. The tagline already
+  // states that scripts cover the other browsers and platforms.
+  if (slug === "slim") return "macOS";
+  return "macOS, Windows";
+}
+
+export function homeJsonLd(): Record<string, unknown> {
+  const listedApps = LISTED.map((slug) => {
+    const app = apps.find((entry) => entry.slug === slug);
+    if (!app) throw new Error(`JSON-LD: catalogue is missing "${slug}".`);
+    return app;
+  });
+
+  return {
+    "@context": "https://schema.org",
+    "@graph": [
+      {
+        "@type": "WebSite",
+        "@id": `${SITE}/#website`,
+        url: `${SITE}/`,
+        name: "Spiral",
+        description: COLLECTION_DESCRIPTION,
+        publisher: { "@id": `${SITE}/#org` },
+      },
+      {
+        "@type": "Organization",
+        "@id": `${SITE}/#org`,
+        name: "Spiral",
+        url: `${SITE}/`,
+        email: "cohencool@icloud.com",
+      },
+      {
+        "@type": "SoftwareApplication",
+        "@id": `${SITE}/#collection`,
+        name: "Spiral Collection",
+        url: `${SITE}/`,
+        description: COLLECTION_DESCRIPTION,
+        applicationCategory: "DesktopApplication",
+        operatingSystem: "macOS, Windows",
+        offers: OFFER,
+        featureList: [
+          "One $9.99 license",
+          "No telemetry",
+          "No background processes",
+          "Nothing to sign in to",
+          "Source you can read",
+        ],
+        publisher: { "@id": `${SITE}/#org` },
+      },
+      {
+        "@type": "ItemList",
+        "@id": `${SITE}/#apps`,
+        name: "Spiral Collection apps",
+        numberOfItems: listedApps.length,
+        itemListElement: listedApps.map((app, i) => ({
+          "@type": "ListItem",
+          position: i + 1,
+          item: {
+            "@type": "SoftwareApplication",
+            "@id": `${SITE}${app.page}#app`,
+            name: app.name,
+            url: `${SITE}${app.page}`,
+            description: app.tagline,
+            applicationCategory: "DesktopApplication",
+            operatingSystem: operatingSystem(app.slug),
+            softwareVersion: app.version,
+            downloadUrl: app.downloads?.mac.url,
+            offers: OFFER,
+            publisher: { "@id": `${SITE}/#org` },
+          },
+        })),
+      },
+    ],
+  };
+}
diff --git a/collection/public/robots.txt b/collection/public/robots.txt
new file mode 100644
index 0000000..2149f62
--- /dev/null
+++ b/collection/public/robots.txt
@@ -0,0 +1,9 @@
+# Spiral Collection — https://spiralcc.tech
+# Allow crawlers. /thanks is a post-purchase download page (noindex).
+
+User-agent: *
+Allow: /
+Disallow: /thanks
+Disallow: /thanks/
+
+Sitemap: https://spiralcc.tech/sitemap.xml
diff --git a/collection/public/sitemap.xml b/collection/public/sitemap.xml
new file mode 100644
index 0000000..fdfa8e5
--- /dev/null
+++ b/collection/public/sitemap.xml
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+  <url>
+    <loc>https://spiralcc.tech/</loc>
+    <changefreq>weekly</changefreq>
+    <priority>1.0</priority>
+  </url>
+  <url>
+    <loc>https://spiralcc.tech/wallpaper/</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.8</priority>
+  </url>
+  <url>
+    <loc>https://spiralcc.tech/slim/</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.8</priority>
+  </url>
+  <url>
+    <loc>https://spiralcc.tech/resume/</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.8</priority>
+  </url>
+  <url>
+    <loc>https://spiralcc.tech/clean/</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.8</priority>
+  </url>
+  <url>
+    <loc>https://spiralcc.tech/privacy/</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.6</priority>
+  </url>
+  <url>
+    <loc>https://spiralcc.tech/work/</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.6</priority>
+  </url>
+</urlset>