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diff --git a/bin/udt-appthemes b/bin/udt-appthemes
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+#!/usr/bin/env python3
+# udt-appthemes: install the generated app themes that need more than a copy.
+# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+# Licensed under the GNU General Public License v2 only.
+"""Install the Obsidian snippet into every vault, and the Typora theme.
+
+Separate from install.sh because enabling an Obsidian snippet means editing
+JSON that the user also owns: appearance.json lists every enabled snippet, so
+the entry has to be appended rather than the file rewritten, or a vault loses
+whatever layout snippets it had.
+"""
+
+import json
+import shutil
+import sys
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parent.parent
+SNIPPET = "udt"
+OBSIDIAN_REGISTRY = Path.home() / ".config" / "obsidian" / "obsidian.json"
+TYPORA_THEMES = Path.home() / ".config" / "Typora" / "themes"
+
+
+def vaults():
+    """The vaults Obsidian itself knows about.
+
+    Read from Obsidian's own registry rather than found by scanning for
+    .obsidian directories. A scan cannot tell a vault from an abandoned one:
+    ~/Documents/Obsidian holds a leftover .obsidian from a vault that no longer
+    exists, and writing to it touched config for something Obsidian never
+    opens.
+    """
+    try:
+        data = json.loads(OBSIDIAN_REGISTRY.read_text())
+    except (OSError, json.JSONDecodeError):
+        return []
+
+    found = []
+    for entry in data.get("vaults", {}).values():
+        path = entry.get("path")
+        if not path:
+            continue
+        config = Path(path) / ".obsidian"
+        if config.is_dir():
+            found.append(config)
+    return sorted(found)
+
+
+def install_obsidian(source):
+    """Copy the snippet into each vault and enable it, preserving the rest."""
+    done = []
+    for config in vaults():
+        snippets = config / "snippets"
+        snippets.mkdir(exist_ok=True)
+        shutil.copyfile(source, snippets / f"{SNIPPET}.css")
+
+        appearance = config / "appearance.json"
+        try:
+            data = json.loads(appearance.read_text())
+        except (OSError, json.JSONDecodeError):
+            data = {}
+
+        enabled = data.get("enabledCssSnippets", [])
+        if SNIPPET not in enabled:
+            # Append: a vault may already have snippets on, and replacing the
+            # list would silently switch them off.
+            enabled.append(SNIPPET)
+            data["enabledCssSnippets"] = enabled
+            appearance.write_text(json.dumps(data, indent=2) + "\n")
+
+        done.append(config.parent.name or str(config.parent))
+    return done
+
+
+def install_typora(source):
+    """Drop the theme in. Typora picks it from Themes once the file exists."""
+    if not TYPORA_THEMES.is_dir():
+        return False
+    shutil.copyfile(source, TYPORA_THEMES / "udt.css")
+    return True
+
+
+def main():
+    obsidian = REPO / "templates" / "obsidian" / "udt.css"
+    typora = REPO / "templates" / "typora" / "udt.css"
+
+    if not obsidian.exists() or not typora.exists():
+        print("udt-appthemes: run udt-palette first", file=sys.stderr)
+        return 1
+
+    names = install_obsidian(obsidian)
+    if names:
+        print(f"obsidian: {len(names)} vaults ({', '.join(names)})")
+
+    if install_typora(typora):
+        print("typora: udt.css installed (select it in Themes)")
+
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())