diff --git a/about.html b/about.html
index 5039ba1..1d54da4 100644
--- a/about.html
+++ b/about.html
@@ -13,15 +13,40 @@
   <meta property="og:description" content="What is UTCI? How does the SunScope soak-factor work? Learn how SunScope calculates urban concrete heat, vehicle interior temperatures, and gives you a more honest outdoor comfort forecast." />
   <meta property="og:url" content="https://sunscope.net/about.html" />
   <meta property="og:type" content="website" />
+  <!-- og:image: replace with your 1200×630 social sharing image URL -->
+  <!-- <meta property="og:image" content="https://sunscope.net/og-image.png" /> -->
+
+  <!-- Twitter Card -->
+  <meta name="twitter:card" content="summary_large_image" />
+  <meta name="twitter:title" content="About SunScope · The True Temperature" />
+  <meta name="twitter:description" content="What is UTCI? How does the SunScope soak-factor work? Learn how SunScope calculates urban heat, vehicle interior temperatures, and gives you a more honest outdoor comfort forecast." />
+  <!-- <meta name="twitter:image" content="https://sunscope.net/og-image.png" /> -->
 
   <link rel="icon" type="image/svg+xml" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>☀️</text></svg>" />
 
+  <link rel="preconnect" href="https://fonts.bunny.net" />
   <link href="https://fonts.bunny.net/css2?family=Fraunces:ital,wght@0,900;1,300&family=Manrope:wght@400;600&family=JetBrains+Mono:wght@400;600&display=swap" rel="stylesheet" />
 
   <link rel="stylesheet" href="./assets/about.css">
 
   <!-- Structured data for AEO / AI search -->
   <script type="application/ld+json">
+  {
+    "@context": "https://schema.org",
+    "@type": "WebApplication",
+    "name": "SunScope",
+    "url": "https://sunscope.net",
+    "description": "A free hourly UTCI thermal comfort forecast combining air temperature, humidity, wind speed, and solar radiation. Includes vehicle interior temperature, indoor temperature, UV burn time, concrete surface temperature, and soil data.",
+    "applicationCategory": "WeatherApplication",
+    "operatingSystem": "Any",
+    "offers": {
+      "@type": "Offer",
+      "price": "0",
+      "priceCurrency": "GBP"
+    }
+  }
+  </script>
+  <script type="application/ld+json">
   {
     "@context": "https://schema.org",
     "@type": "WebSite",
diff --git a/index.html b/index.html
index 5719bfd..ec9dece 100644
--- a/index.html
+++ b/index.html
@@ -3,8 +3,73 @@
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <meta name="description" content="SunScope - UTCI weather forecast showing real thermal comfort, not just air temperature." />
-    <title>SunScope · The True Temperature</title>
+    <title>SunScope – UTCI Thermal Comfort Forecast | The True Temperature</title>
+    <meta name="description" content="SunScope gives you a real felt-temperature forecast using UTCI — combining air temperature, humidity, wind, and solar radiation. See vehicle interior heat, indoor temps, UV burn time, and soil data, hour by hour." />
+    <meta name="robots" content="index, follow" />
+    <link rel="canonical" href="https://sunscope.net" />
+
+    <!-- Open Graph -->
+    <meta property="og:title" content="SunScope – UTCI Thermal Comfort Forecast | The True Temperature" />
+    <meta property="og:description" content="Not just air temperature. SunScope uses UTCI to show how the weather will actually feel on your body — including solar radiation, wind, humidity, and precipitation. Free, worldwide, hourly." />
+    <meta property="og:url" content="https://sunscope.net/" />
+    <meta property="og:type" content="website" />
+    <!-- og:image: replace with your 1200×630 social sharing image URL -->
+    <meta property="og:image" content="https://sunscope.net/og-image.png" />
+
+    <!-- Twitter Card -->
+    <meta name="twitter:card" content="summary_large_image" />
+    <meta name="twitter:title" content="SunScope – UTCI Thermal Comfort Forecast | The True Temperature" />
+    <meta name="twitter:description" content="Not just air temperature. SunScope uses UTCI to show how the weather will actually feel on your body — including solar radiation, wind, humidity, and precipitation." />
+    <meta name="twitter:image" content="https://sunscope.net/og-image.png" />
+
+    <!-- Structured data -->
+    <script type="application/ld+json">
+    {
+      "@context": "https://schema.org",
+      "@type": "WebSite",
+      "name": "SunScope",
+      "url": "https://sunscope.net",
+      "description": "SunScope is a free outdoor thermal comfort forecast using the Universal Thermal Climate Index (UTCI) and the SunScope soak-factor for precipitation.",
+      "potentialAction": {
+        "@type": "SearchAction",
+        "target": {
+          "@type": "EntryPoint",
+          "urlTemplate": "https://sunscope.net/?q={search_term_string}"
+        },
+        "query-input": "required name=search_term_string"
+      }
+    }
+    </script>
+    <script type="application/ld+json">
+    {
+      "@context": "https://schema.org",
+      "@type": "WebApplication",
+      "name": "SunScope",
+      "url": "https://sunscope.net",
+      "description": "A free hourly UTCI thermal comfort forecast combining air temperature, humidity, wind speed, and solar radiation. Includes vehicle interior temperature, indoor temperature, UV burn time, concrete surface temperature, and soil data.",
+      "applicationCategory": "WeatherApplication",
+      "operatingSystem": "Any",
+      "offers": {
+        "@type": "Offer",
+        "price": "0",
+        "priceCurrency": "GBP"
+      },
+      "featureList": [
+        "UTCI thermal comfort index",
+        "Soak-factor precipitation penalty (UTCI+P)",
+        "Vehicle interior temperature model",
+        "Indoor building temperature model",
+        "UV-A and UV-B index with burn time",
+        "Urban concrete surface temperature",
+        "Soil temperature and moisture",
+        "Worldwide location search",
+        "Hourly forecast, auto-refreshes every 5 minutes"
+      ]
+    }
+    </script>
+
+    <link rel="preconnect" href="https://fonts.bunny.net" />
+    <link rel="preconnect" href="https://api.open-meteo.com" />
     <link rel="icon" type="image/svg+xml" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>☀️</text></svg>" />
     <link rel="stylesheet" href="./assets/sunscope.css?v=15a">
   </head>
diff --git a/og-image.png b/og-image.png
new file mode 100644
index 0000000..6c9428f
Binary files /dev/null and b/og-image.png differ
diff --git a/sitemap.xml b/sitemap.xml
index 8f7db3d..1af7bfe 100644
--- a/sitemap.xml
+++ b/sitemap.xml
@@ -2,11 +2,13 @@
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
   <url>
     <loc>https://sunscope.net/</loc>
+    <lastmod>2026-05-15</lastmod>
     <changefreq>daily</changefreq>
     <priority>1.0</priority>
   </url>
   <url>
     <loc>https://sunscope.net/about.html</loc>
+    <lastmod>2026-05-15</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.8</priority>
   </url>
