diff --git a/src/app/globals.css b/src/app/globals.css
index 0192bb9a..0c96f3bb 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -111,8 +111,6 @@
 }
 
 /* CrawlProof ad unit: zero height until ad.js starts a fill, so an unsold or
-   blocked slot leaves no hole. Reserves the format plus ad.js's caption. */
+   blocked slot leaves no hole. Low profile: one thin text_link line. */
 .cp-ad { height: 0; overflow: hidden; }
-.cp-ad[data-cp-filled] { height: auto; overflow: visible; margin: 2rem 0; }
-.cp-ad[data-cp-filled][data-format="banner_728x90"] { min-height: 106px; }
-.cp-ad[data-cp-filled][data-format="banner_300x250"] { min-height: 266px; }
+.cp-ad[data-cp-filled] { height: auto; overflow: visible; margin: 0.5rem 0; }
diff --git a/src/components/ad-unit.tsx b/src/components/ad-unit.tsx
index 048d5642..77ec6395 100644
--- a/src/components/ad-unit.tsx
+++ b/src/components/ad-unit.tsx
@@ -1,48 +1,38 @@
 "use client";
 
-import { useEffect, useState } from "react";
+import { useEffect } from "react";
 import { usePathname } from "next/navigation";
-import { AD_SLOT, isAdPage, requestAdScan, type AdFormat } from "@/lib/ads";
-
-/** 728x90 needs the full content column; narrower viewports get the 300x250. */
-const LEADERBOARD_QUERY = "(min-width: 768px)";
+import { AD_SLOT, isAdPage, requestAdScan } from "@/lib/ads";
 
 /**
- * One CrawlProof unit at the top of the main content on smshub.dev public pages
- * (never above or inside the footer).
+ * One low-profile CrawlProof text_link unit at the top of the main content on
+ * smshub.dev public pages (never the homepage, never above or inside the footer).
  *
- * The div is rendered without `data-slot`, so ad.js's own first pass skips it;
- * the mount effect picks one format from the viewport, sets slot + format and
- * asks for a scan. Exactly one fill, never a hidden twin. The wrapper collapses
- * to nothing until ad.js marks the unit `data-cp-filled` (see globals.css).
+ * The wrapper collapses to nothing until ad.js marks the unit `data-cp-filled`
+ * (see globals.css). The mount effect asks ad.js to rescan, since client
+ * navigation mounts the unit after ad.js's first pass.
  */
 export function AdUnit() {
   const pathname = usePathname();
   const show = isAdPage(pathname);
-  const [format, setFormat] = useState<AdFormat | null>(null);
 
   useEffect(() => {
     if (!show) return;
-    setFormat(window.matchMedia(LEADERBOARD_QUERY).matches ? "banner_728x90" : "banner_300x250");
-  }, [show]);
-
-  useEffect(() => {
-    if (!show || !format) return;
     return requestAdScan();
-  }, [show, format, pathname]);
+  }, [show, pathname]);
 
   if (!show) return null;
 
   return (
-    <div className="cp-ad-wrap flex justify-center px-4">
+    <div className="cp-ad-wrap px-4">
       <div
         // Keyed by path so each client navigation mounts a fresh unit: ad.js
         // will not refill an element it has already filled.
-        key={`${pathname}:${format ?? "pending"}`}
+        key={pathname}
         className="cp-ad"
         data-cp-ad=""
-        data-slot={format ? AD_SLOT : undefined}
-        data-format={format ?? undefined}
+        data-slot={AD_SLOT}
+        data-format="text_link"
       />
     </div>
   );
diff --git a/src/lib/__tests__/ads.test.ts b/src/lib/__tests__/ads.test.ts
index 0d3bb346..87c1929e 100644
--- a/src/lib/__tests__/ads.test.ts
+++ b/src/lib/__tests__/ads.test.ts
@@ -3,12 +3,12 @@ import { isAdPage } from "../ads";
 
 describe("isAdPage", () => {
   it("shows on public pages", () => {
-    for (const p of ["/", "/docs", "/docs/telnyx", "/privacy", "/terms/", "/sms", "/phonenumbers"]) {
+    for (const p of ["/docs", "/docs/telnyx", "/privacy", "/terms/", "/sms", "/phonenumbers"]) {
       expect(isAdPage(p)).toBe(true);
     }
   });
-  it("never shows in the app, auth or checkout", () => {
-    for (const p of ["/inbox", "/numbers", "/settings", "/login", "/register", "/org/x", "/docsx", null]) {
+  it("never shows on the homepage, in the app, auth or checkout", () => {
+    for (const p of ["/", "/inbox", "/numbers", "/settings", "/login", "/register", "/org/x", "/docsx", null]) {
       expect(isAdPage(p)).toBe(false);
     }
   });
diff --git a/src/lib/ads.ts b/src/lib/ads.ts
index 0d534f50..582c28b5 100644
--- a/src/lib/ads.ts
+++ b/src/lib/ads.ts
@@ -16,10 +16,10 @@ export const AD_HEIGHTS: Record<AdFormat, number> = {
 };
 
 /**
- * Public marketing/docs pages that carry the unit. Everything else (inbox,
- * numbers, settings, auth, checkout) stays ad-free.
+ * Public marketing/docs pages that carry the unit. The homepage and everything
+ * else (inbox, numbers, settings, auth, checkout) stays ad-free.
  */
-const AD_EXACT = new Set(["/", "/privacy", "/terms", "/sms", "/install", "/phonenumbers", "/verification-numbers"]);
+const AD_EXACT = new Set(["/privacy", "/terms", "/sms", "/install", "/phonenumbers", "/verification-numbers"]);
 const AD_PREFIXES = ["/docs"];
 
 export function isAdPage(pathname: string | null | undefined): boolean {