diff --git a/apps/developer-docs/docs/.vitepress/config.mts b/apps/developer-docs/docs/.vitepress/config.mts
index 5a74acc0..030df609 100644
--- a/apps/developer-docs/docs/.vitepress/config.mts
+++ b/apps/developer-docs/docs/.vitepress/config.mts
@@ -1,9 +1,10 @@
 /// <reference path="./env.d.ts" />
-import { defineConfig, type HeadConfig, type PageData } from "vitepress";
+import { defineConfig, type PageData } from "vitepress";
 import { tabsMarkdownPlugin } from "vitepress-plugin-tabs";
 import { withMermaid } from "vitepress-plugin-mermaid";
 import { extendConfig } from "@voidzero-dev/vitepress-theme/config";
 import llmstxt from "vitepress-plugin-llms";
+import { canonicalLink, siteJsonLd } from "@plane/docs-theme/seo";
 import { readFileSync, readdirSync, statSync, mkdirSync, copyFileSync } from "node:fs";
 import { resolve, join, relative, dirname } from "node:path";
 
@@ -213,21 +214,22 @@ export default extendConfig(
           "meta",
           { name: "twitter:image", content: "https://media.docs.plane.so/logo/og-docs.webp#hero" },
         ],
+
+        // Organization + WebSite JSON-LD (shared identity from packages/theme)
+        siteJsonLd({
+          name: "Plane Developer Docs",
+          url: "https://developers.plane.so",
+          description:
+            "Developer documentation for Plane: REST API reference, webhooks, MCP server, OAuth apps, and self-hosting guides.",
+        }),
       ],
 
       transformPageData(pageData: PageData) {
         const head = (pageData.frontmatter.head ??= []);
 
-        // Inject canonical URL if not already defined in frontmatter
-        const hasCanonical = (head as HeadConfig[]).some(
-          ([tag, attrs]) => tag === "link" && attrs?.rel === "canonical",
-        );
-        if (!hasCanonical) {
-          const canonicalUrl = `https://developers.plane.so/${pageData.relativePath}`
-            .replace(/index\.md$/, "")
-            .replace(/\.md$/, "");
-          head.push(["link", { rel: "canonical", href: canonicalUrl }]);
-        }
+        // Canonical URL per page (skipped when frontmatter already sets one)
+        const canonical = canonicalLink("https://developers.plane.so", pageData);
+        if (canonical) head.push(canonical);
 
         // Inject frontmatter keywords as a meta tag (VitePress doesn't do this natively)
         const keywords = pageData.frontmatter.keywords;
diff --git a/apps/docs/docs/.vitepress/config.ts b/apps/docs/docs/.vitepress/config.ts
index ebeae667..ad4ab588 100644
--- a/apps/docs/docs/.vitepress/config.ts
+++ b/apps/docs/docs/.vitepress/config.ts
@@ -6,6 +6,7 @@ import { defineConfig } from "vitepress";
 import { extendConfig } from "@voidzero-dev/vitepress-theme/config";
 import { tabsMarkdownPlugin } from "vitepress-plugin-tabs";
 import llmstxt from "vitepress-plugin-llms";
+import { canonicalLink, siteJsonLd } from "@plane/docs-theme/seo";
 
 function loadEnvVar(key: string): string | undefined {
   // process.env takes precedence (CI/hosting platforms set vars here)
@@ -211,6 +212,13 @@ const config = defineConfig({
         content: "index, follow",
       },
     ],
+    // Organization + WebSite JSON-LD (shared identity from packages/theme)
+    siteJsonLd({
+      name: "Plane Docs",
+      url: "https://docs.plane.so",
+      description:
+        "Product documentation for Plane: workspaces, projects, work items, cycles, modules, pages, integrations, importers, automations, and Plane AI.",
+    }),
   ],
 
   themeConfig: {
@@ -785,6 +793,12 @@ const config = defineConfig({
 
   // Enables per-page git timestamps used for sitemap <lastmod> (and the
   // "Last updated" footer). Without this, sitemap entries omit lastmod.
+  transformPageData(pageData) {
+    // Canonical URL per page (skipped when frontmatter already sets one)
+    const canonical = canonicalLink("https://docs.plane.so", pageData);
+    if (canonical) (pageData.frontmatter.head ??= []).push(canonical);
+  },
+
   lastUpdated: true,
 
   sitemap: {
diff --git a/packages/theme/README.md b/packages/theme/README.md
index c077c3f6..63605ec0 100644
--- a/packages/theme/README.md
+++ b/packages/theme/README.md
@@ -44,6 +44,7 @@ the repo root); changes hot-reload through the workspace link. `pnpm check:types
 src/
   index.ts        createPlaneTheme(options) + client setup (appearance sync, medium-zoom, tab hashes)
   options.ts      PlaneThemeOptions / planeOptionsKey
+  seo.ts          build-time helpers for the VitePress configs (`@plane/docs-theme/seo`): Organization/WebSite JSON-LD, canonical link
   layout/         Layout.vue, doc-layout.vue (PlaneHeader + bordered content wrapper), slots/header helpers
   components/     PlaneHeader, CopyPageMenu, CookieConsent, Card, CardGroup, Tags, brand icons
   css/            index.css → fonts, tokens, base, layout, components, api
diff --git a/packages/theme/package.json b/packages/theme/package.json
index 583a9731..3753760b 100644
--- a/packages/theme/package.json
+++ b/packages/theme/package.json
@@ -6,6 +6,7 @@
   "type": "module",
   "exports": {
     ".": "./src/index.ts",
+    "./seo": "./src/seo.ts",
     "./package.json": "./package.json"
   },
   "scripts": {
diff --git a/packages/theme/src/seo.ts b/packages/theme/src/seo.ts
new file mode 100644
index 00000000..11ca5bf0
--- /dev/null
+++ b/packages/theme/src/seo.ts
@@ -0,0 +1,83 @@
+/**
+ * Build-time SEO helpers shared by both sites. Imported by the VitePress
+ * configs as `@plane/docs-theme/seo`; nothing here ships to the browser.
+ */
+import type { HeadConfig, PageData } from "vitepress";
+
+const PLANE_ORGANIZATION_ID = "https://plane.so/#organization";
+
+/**
+ * Plane as a schema.org Organization. Single source of truth so both sites
+ * publish the same identity (name, logo, profiles, contact points).
+ */
+export const planeOrganization = {
+  "@type": "Organization",
+  "@id": PLANE_ORGANIZATION_ID,
+  name: "Plane",
+  url: "https://plane.so",
+  logo: "https://media.docs.plane.so/logo/new-logo-white.png",
+  sameAs: ["https://github.com/makeplane", "https://x.com/planepowers"],
+  contactPoint: [
+    {
+      "@type": "ContactPoint",
+      contactType: "customer support",
+      email: "support@plane.so",
+      url: "https://docs.plane.so/support/get-help",
+      availableLanguage: "English",
+    },
+    {
+      "@type": "ContactPoint",
+      contactType: "sales",
+      email: "sales@plane.so",
+      availableLanguage: "English",
+    },
+  ],
+};
+
+export interface SiteIdentity {
+  /** Site name, e.g. "Plane Docs". */
+  name: string;
+  /** Origin without a trailing slash, e.g. "https://docs.plane.so". */
+  url: string;
+  /** One-sentence description of what the site covers. */
+  description: string;
+}
+
+/**
+ * `<script type="application/ld+json">` head entry describing the site
+ * (WebSite) and its publisher (the Plane Organization). Add it to `head` so
+ * every page carries it; agents and search engines read it from the homepage.
+ */
+export function siteJsonLd(site: SiteIdentity): HeadConfig {
+  const data = {
+    "@context": "https://schema.org",
+    "@graph": [
+      planeOrganization,
+      {
+        "@type": "WebSite",
+        "@id": `${site.url}/#website`,
+        name: site.name,
+        url: site.url,
+        description: site.description,
+        inLanguage: "en",
+        publisher: { "@id": PLANE_ORGANIZATION_ID },
+      },
+    ],
+  };
+  // Nothing above contains "<", but escape anyway so a future edit can never
+  // close the <script> element early.
+  return ["script", { type: "application/ld+json" }, JSON.stringify(data).replace(/</g, "\\u003c")];
+}
+
+/**
+ * `<link rel="canonical">` for a page, or undefined when the page's
+ * frontmatter already sets one. Mirrors cleanUrls: `dir/page.md` →
+ * `${origin}/dir/page`, `dir/index.md` → `${origin}/dir`, `index.md` →
+ * `${origin}/`. Call from `transformPageData`.
+ */
+export function canonicalLink(origin: string, pageData: PageData): HeadConfig | undefined {
+  const head = (pageData.frontmatter.head ?? []) as HeadConfig[];
+  if (head.some(([tag, attrs]) => tag === "link" && attrs?.rel === "canonical")) return undefined;
+  const path = pageData.relativePath.replace(/\.md$/, "").replace(/(^|\/)index$/, "");
+  return ["link", { rel: "canonical", href: path ? `${origin}/${path}` : `${origin}/` }];
+}