diff --git a/www/src/lib/seo.test.ts b/www/src/lib/seo.test.ts
index b3886a7..1d1e516 100644
--- a/www/src/lib/seo.test.ts
+++ b/www/src/lib/seo.test.ts
@@ -6,6 +6,7 @@ import {
   buildWebSiteJsonLd,
   buildBreadcrumbJsonLd,
   buildTitle,
+  buildProductJsonLd,
 } from "./seo";
 
 describe("seo builders", () => {
@@ -70,4 +71,18 @@ describe("seo builders", () => {
   it("buildTitle appends the brand", () => {
     expect(buildTitle("PostgreSQL GUI")).toBe("PostgreSQL GUI | Gridline");
   });
+
+  it("buildProductJsonLd returns valid Product schema", () => {
+    const ld = buildProductJsonLd({
+      name: "Gridline",
+      url: "https://getgridline.app/",
+      description: "Open-source database GUI",
+      image: "https://getgridline.app/og.png",
+      offersPrice: 0,
+      offersCurrency: "USD",
+    });
+    expect(ld["@type"]).toBe("Product");
+    expect(ld.name).toBe("Gridline");
+    expect((ld.offers as { price: number }).price).toBe(0);
+  });
 });
diff --git a/www/src/lib/seo.ts b/www/src/lib/seo.ts
index e7c9994..7c9fee5 100644
--- a/www/src/lib/seo.ts
+++ b/www/src/lib/seo.ts
@@ -108,3 +108,26 @@ export function buildBreadcrumbJsonLd(
 export function buildTitle(primary: string, brand = "Gridline"): string {
   return `${primary} | ${brand}`;
 }
+
+export function buildProductJsonLd(opts: {
+  name: string;
+  url: string;
+  description: string;
+  image: string;
+  offersPrice: number;
+  offersCurrency: string;
+}): JsonLd {
+  return {
+    "@context": "https://schema.org",
+    "@type": "Product",
+    name: opts.name,
+    url: opts.url,
+    description: opts.description,
+    image: opts.image,
+    offers: {
+      "@type": "Offer",
+      price: opts.offersPrice,
+      priceCurrency: opts.offersCurrency,
+    },
+  };
+}