diff --git a/site/index.html b/site/index.html
index cb058bd1..f54f775d 100644
--- a/site/index.html
+++ b/site/index.html
@@ -6,22 +6,22 @@
     <title>Harness — run a team of Claude Code agents</title>
     <meta
       name="description"
-      content="A native macOS app for managing parallel Claude Code and Codex sessions across git worktrees, with reliable status detection and PR tracking."
+      content="A native app for managing parallel Claude Code and Codex sessions across git worktrees, with reliable status detection and PR tracking."
     />
 
     <meta property="og:site_name" content="Harness" />
     <meta property="og:title" content="Harness — run a team of agents" />
     <meta
       property="og:description"
-      content="Run ten Claudes at once without losing your mind. A native macOS app for managing parallel Claude Code and Codex sessions across git worktrees."
+      content="Run ten Claudes at once without losing your mind. A native app for managing parallel Claude Code and Codex sessions across git worktrees."
     />
-    <meta property="og:image" content="https://harness.mikelyons.org/og-image.png" />
+    <meta property="og:image" content="https://harness.mikelyons.org/og-image.png?v=chat-mode" />
     <meta property="og:image:width" content="1200" />
     <meta property="og:image:height" content="630" />
     <meta property="og:image:type" content="image/png" />
     <meta
       property="og:image:alt"
-      content="Screenshot of Harness showing the worktree sidebar, terminal tabs, and changed-files panel."
+      content="Screenshot of Harness with the Chat mode interface showing a Claude conversation, approval cards, and the worktree sidebar."
     />
     <meta property="og:url" content="https://harness.mikelyons.org/" />
     <meta property="og:type" content="website" />
@@ -30,12 +30,12 @@
     <meta name="twitter:title" content="Harness — run a team of agents" />
     <meta
       name="twitter:description"
-      content="Run ten Claudes at once without losing your mind. A native macOS app for managing parallel Claude Code and Codex sessions across git worktrees."
+      content="Run ten Claudes at once without losing your mind. A native app for managing parallel Claude Code and Codex sessions across git worktrees."
     />
-    <meta name="twitter:image" content="https://harness.mikelyons.org/og-image.png" />
+    <meta name="twitter:image" content="https://harness.mikelyons.org/og-image.png?v=chat-mode" />
     <meta
       name="twitter:image:alt"
-      content="Screenshot of Harness showing the worktree sidebar, terminal tabs, and changed-files panel."
+      content="Screenshot of Harness with the Chat mode interface showing a Claude conversation, approval cards, and the worktree sidebar."
     />
 
     <link rel="icon" type="image/png" href="/icon.png" />
diff --git a/site/og-build/build.py b/site/og-build/build.py
index 54ff7abf..8c1e3611 100755
--- a/site/og-build/build.py
+++ b/site/og-build/build.py
@@ -17,7 +17,12 @@
 
 def data_uri(path: str) -> str:
     ext = os.path.splitext(path)[1].lower()
-    mime = "image/jpeg" if ext in (".jpg", ".jpeg") else "image/png"
+    if ext in (".jpg", ".jpeg"):
+        mime = "image/jpeg"
+    elif ext == ".webp":
+        mime = "image/webp"
+    else:
+        mime = "image/png"
     with open(path, "rb") as f:
         return f"data:{mime};base64," + base64.b64encode(f.read()).decode()
 
@@ -51,7 +56,7 @@ def render(template_name: str, output_name: str, replacements: dict) -> None:
 
 def main() -> int:
     icon = data_uri(os.path.join(PUBLIC, "icon.png"))
-    shot = data_uri(os.path.join(PUBLIC, "harness-demo-poster.jpg"))
+    shot = data_uri(os.path.join(PUBLIC, "announcements/img/chat-mode.webp"))
 
     render("template.html", "og-image.png", {
         "ICON_DATA_URI": icon,
diff --git a/site/og-build/template.html b/site/og-build/template.html
index 1f3899b6..6fce3e61 100644
--- a/site/og-build/template.html
+++ b/site/og-build/template.html
@@ -81,7 +81,7 @@
       <div class="title">Harness</div>
     </div>
     <div class="tagline">Run a team of agents.</div>
-    <div class="sub">Run ten Claudes at once without losing your mind — a native macOS app for parallel Claude Code sessions.</div>
+    <div class="sub">Run ten Claudes at once without losing your mind — a native app for parallel Claude Code sessions.</div>
     <div class="shot-frame">
       <img src="SHOT_DATA_URI" />
     </div>
diff --git a/site/public/guide.html b/site/public/guide.html
index 124c0c13..2df63567 100644
--- a/site/public/guide.html
+++ b/site/public/guide.html
@@ -459,7 +459,7 @@ <h2 class="text-2xl font-bold text-neutral-100">Where Harness comes in</h2>
           is a pitch for a tool I built for when it isn't.
         </p>
         <p>
-          Harness is a macOS app that puts every worktree and every Claude
+          Harness is a native app that puts every worktree and every Claude
           session in a single window. It's opinionated around the specific
           workflow of running several agents at once, and it handles the
           papercuts that pile up past two or three parallel tasks.
diff --git a/site/public/og-image.png b/site/public/og-image.png
index 790152b4..6181615c 100644
Binary files a/site/public/og-image.png and b/site/public/og-image.png differ