diff --git a/README.md b/README.md
index 8141b56..874d62e 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ A [Model Context Protocol](https://modelcontextprotocol.io/) server that lets AI
 
 ## Features
 
-- **15 tools** for complete TV control via natural language
+- **18 tools** for complete TV control via natural language
 - **Auto-discovery** — finds Samsung TVs on your network via SSDP
 - **Zero config** — no API keys, no cloud, everything runs locally
 - **Multi-protocol** — combines WebSocket, REST, UPnP/DLNA, and Wake-on-LAN
@@ -28,6 +28,9 @@ A [Model Context Protocol](https://modelcontextprotocol.io/) server that lets AI
 | `tv_apps` | List all installed apps |
 | `tv_launch` | Launch app by name ("netflix") or ID |
 | `tv_close_app` | Close a running app |
+| `tv_current_app` | Detect which app is currently running |
+| `tv_aspect_ratio` | Get/set aspect ratio (Default, 16:9, Zoom, 4:3) |
+| `tv_captions` | Get caption state or toggle subtitles |
 | `tv_browser` | Open a URL in the TV's browser |
 | `tv_text` | Type text into active input fields |
 | `tv_cursor` | Move virtual cursor on screen |
diff --git a/main.py b/main.py
index 6ced0c3..fbecf9e 100644
--- a/main.py
+++ b/main.py
@@ -250,6 +250,64 @@ async def tv_close_app(app: str) -> dict[str, Any]:
     return await _safe(_do)
 
 
+# ── Current App ─────────────────────────────────────────────
+
+
+@mcp.tool()
+async def tv_current_app() -> dict[str, Any]:
+    """Detect which app is currently running on the TV.
+
+    Checks all known apps via REST API. Returns the running app's
+    name, ID, and visibility, or a message if no known app is active.
+    """
+    def _do():
+        app = _tv.current_app()
+        if app:
+            return _ok(f"Running: {app['name']}", **app)
+        return _ok("No known app is currently running")
+    return await _safe(_do, timeout=40)
+
+
+# ── Aspect Ratio ────────────────────────────────────────────
+
+
+@mcp.tool()
+async def tv_aspect_ratio(ratio: Optional[str] = None) -> dict[str, Any]:
+    """Get or set the TV's aspect ratio.
+
+    Args:
+        ratio: Set to this value. Known values: "Default", "16:9", "Zoom",
+               "4:3", "Screen Fit". Omit to just read current ratio.
+    """
+    def _do():
+        if ratio:
+            _tv.set_aspect_ratio(ratio)
+            return _ok(f"Aspect ratio set to {ratio}", ratio=ratio)
+        current = _tv.get_aspect_ratio()
+        return _ok(f"Aspect ratio: {current}", ratio=current)
+    return await _safe(_do)
+
+
+# ── Captions ────────────────────────────────────────────────
+
+
+@mcp.tool()
+async def tv_captions(toggle: bool = False) -> dict[str, Any]:
+    """Get caption/subtitle state or toggle captions on/off.
+
+    Args:
+        toggle: If True, sends the CAPTION key to toggle subtitles.
+                If False (default), just returns current caption state.
+    """
+    def _do():
+        if toggle:
+            _tv.send_key("KEY_CAPTION")
+            return _ok("Caption toggled")
+        state = _tv.get_captions()
+        return _ok("Caption state", **state)
+    return await _safe(_do)
+
+
 # ── Browser & Text ───────────────────────────────────────────────
 
 
diff --git a/tv.py b/tv.py
index a276db4..39c9c16 100644
--- a/tv.py
+++ b/tv.py
@@ -430,6 +430,59 @@ class SamsungTV:
             raise ValueError(f"Unknown: '{action}'. Valid: play, pause, stop, seek, status")
         return {"action": a, "done": True}
 
+    # ── App Detection ────────────────────────────────────────
+
+    def current_app(self) -> dict[str, Any] | None:
+        """Detect which known app is currently running via REST."""
+        ip = self._ensure_ip()
+        for name, ids in APP_ALIASES.items():
+            try:
+                raw = urlopen(
+                    f"http://{ip}:8001/api/v2/applications/{ids[0]}",
+                    timeout=2,
+                ).read()
+                data = json.loads(raw)
+                if data.get("running"):
+                    return {
+                        "name": name,
+                        "id": ids[0],
+                        "visible": data.get("visible", False),
+                    }
+            except Exception:
+                continue
+        return None
+
+    # ── Aspect Ratio ──────────────────────────────────────────
+
+    def get_aspect_ratio(self) -> str:
+        ip = self._ensure_ip()
+        xml = _soap_call(
+            ip, "/upnp/control/RenderingControl1", "RenderingControl",
+            "X_GetAspectRatio", "<InstanceID>0</InstanceID>",
+        )
+        return _soap_value(xml, "AspectRatio") or "Unknown"
+
+    def set_aspect_ratio(self, ratio: str) -> None:
+        ip = self._ensure_ip()
+        _soap_call(
+            ip, "/upnp/control/RenderingControl1", "RenderingControl",
+            "X_SetAspectRatio",
+            f"<InstanceID>0</InstanceID><AspectRatio>{ratio}</AspectRatio>",
+        )
+
+    # ── Captions ──────────────────────────────────────────────
+
+    def get_captions(self) -> dict[str, str]:
+        ip = self._ensure_ip()
+        xml = _soap_call(
+            ip, "/upnp/control/RenderingControl1", "RenderingControl",
+            "X_GetCaptionState", "<InstanceID>0</InstanceID>",
+        )
+        return {
+            "captions": _soap_value(xml, "Captions") or "",
+            "enabled": _soap_value(xml, "EnabledCaptions") or "",
+        }
+
     def close(self) -> None:
         if self._ws:
             try: