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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"
+VAULT_ROOT = Path.home() / "Documents" / "Obsidian"
+TYPORA_THEMES = Path.home() / ".config" / "Typora" / "themes"
+
+
+def vaults():
+    """Every Obsidian vault under the vault root.
+
+    A vault is any directory holding a .obsidian config dir. Nested vaults are
+    real: a vault inside another vault's folder is still its own vault.
+    """
+    if not VAULT_ROOT.is_dir():
+        return []
+    return sorted(p for p in VAULT_ROOT.rglob(".obsidian") if p.is_dir())
+
+
+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())