feat(website): add hreflang tags, comparison JSON-LD schema, and update sitemap with lastmod

website/index.html

@@ -10,6 +10,9 @@
     <link rel="stylesheet" href="style.css">
     <link rel="icon" type="image/webp" href="assets/NewLogoIcon_64.webp">
     <link rel="canonical" href="https://sync.koalastuff.net/">
+    <link rel="alternate" hreflang="en" href="https://sync.koalastuff.net/">
+    <link rel="alternate" hreflang="de" href="https://sync.koalastuff.net/">
+    <link rel="alternate" hreflang="x-default" href="https://sync.koalastuff.net/">
     <meta name="robots" content="index, follow">
     
     <!-- Open Graph / Facebook -->
@@ -50,7 +53,41 @@
       },
       "description": "Watch Netflix, YouTube, Twitch, Jellyfin, Emby and almost any HTML5 video in perfect sync with friends. Open source, privacy-first, free.",
       "softwareVersion": "1.9.3",
-      "license": "https://opensource.org/licenses/MIT"
+      "license": "https://opensource.org/licenses/MIT",
+      "sameAs": "https://github.com/Shik3i/KoalaSync"
+    }
+    </script>
+    <script type="application/ld+json" id="schema-comparison">
+    {
+      "@context": "https://schema.org",
+      "@type": "ItemList",
+      "name": "KoalaSync vs Teleparty",
+      "description": "Feature comparison: KoalaSync vs Teleparty browser extensions for synchronized video watching.",
+      "itemListElement": [
+        {
+          "@type": "ListItem",
+          "position": 1,
+          "item": {
+            "@type": "SoftwareApplication",
+            "name": "KoalaSync",
+            "applicationCategory": "BrowserApplication",
+            "operatingSystem": "Windows, macOS, Linux, ChromeOS",
+            "offers": { "@type": "Offer", "price": "0", "priceCurrency": "EUR" },
+            "featureList": "100% Free, Open Source (MIT), Self-Hosting (Docker), Zero-Persistence (RAM-only), Universal HTML5 Video Support"
+          }
+        },
+        {
+          "@type": "ListItem",
+          "position": 2,
+          "item": {
+            "@type": "SoftwareApplication",
+            "name": "Teleparty",
+            "applicationCategory": "BrowserApplication",
+            "offers": { "@type": "Offer", "price": "Premium subscription required" },
+            "featureList": "Paid tiers, Proprietary, Limited platforms, Google Analytics"
+          }
+        }
+      ]
     }
     </script>
 </head>

website/sitemap.xml

@@ -2,16 +2,19 @@
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
   <url>
     <loc>https://sync.koalastuff.net/</loc>
-    <changefreq>monthly</changefreq>
+    <lastmod>2026-05-30</lastmod>
+    <changefreq>weekly</changefreq>
     <priority>1.0</priority>
   </url>
   <url>
     <loc>https://sync.koalastuff.net/impressum.html</loc>
+    <lastmod>2026-05-30</lastmod>
     <changefreq>yearly</changefreq>
     <priority>0.3</priority>
   </url>
   <url>
     <loc>https://sync.koalastuff.net/datenschutz.html</loc>
+    <lastmod>2026-05-30</lastmod>
     <changefreq>yearly</changefreq>
     <priority>0.3</priority>
   </url>