diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..3b3c4fa
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,11 @@
+.git
+.venv
+__pycache__
+*.pyc
+.cache-*
+.cache.db
+.session.yml
+auto_sync_status.json
+config.yml
+session.json
+songs not found.txt
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..7027c89
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,20 @@
+FROM python:3.12-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+ENV STREAMLIT_SERVER_ADDRESS=0.0.0.0
+ENV STREAMLIT_SERVER_PORT=8501
+ENV STREAMLIT_BROWSER_GATHER_USAGE_STATS=false
+
+WORKDIR /app
+
+COPY pyproject.toml readme.md LICENSE ./
+COPY src ./src
+COPY app.py ./
+
+RUN python -m pip install --no-cache-dir --upgrade pip \
+    && python -m pip install --no-cache-dir -e .
+
+EXPOSE 8501
+
+CMD ["python", "-m", "streamlit", "run", "app.py"]
diff --git a/Launch Spotify→Tidal.command b/Launch Spotify→Tidal.command
index 477ccef..651433f 100755
--- a/Launch Spotify→Tidal.command	
+++ b/Launch Spotify→Tidal.command	
@@ -4,8 +4,5 @@
 # Change to the project directory (same folder as this script)
 cd "$(dirname "$0")"
 
-# Activate the virtual environment
-source .venv/bin/activate
-
-# Launch Streamlit (opens browser automatically)
-streamlit run app.py
+# Launch Streamlit from the project virtual environment (opens browser automatically)
+.venv/bin/python -m streamlit run app.py
diff --git a/app.py b/app.py
index eb4ea3a..378ae1c 100644
--- a/app.py
+++ b/app.py
@@ -7,6 +7,7 @@ import streamlit as st
 from pathlib import Path
 import spotipy
 
+from spotify_to_tidal import auto_sync as _auto_sync
 from spotify_to_tidal import auth as _auth
 from spotify_to_tidal import sync as _sync
 from spotify_to_tidal.tidalapi_patch import get_all_playlists
@@ -14,6 +15,7 @@ from spotify_to_tidal.tidalapi_patch import get_all_playlists
 # ── Constants ─────────────────────────────────────────────────────────────────
 SESSION_FILE   = Path("session.json")
 NOT_FOUND_FILE = Path("songs not found.txt")
+AUTO_SYNC_STATUS_FILE = Path("auto_sync_status.json")
 
 # ── Session persistence ───────────────────────────────────────────────────────
 def load_session() -> dict:
@@ -38,6 +40,14 @@ def save_watched(ids: set):
 def load_external_playlists() -> list:
     return load_session().get("external_playlists", [])
 
+def load_auto_sync_status() -> dict:
+    if AUTO_SYNC_STATUS_FILE.exists():
+        try:
+            return json.loads(AUTO_SYNC_STATUS_FILE.read_text())
+        except Exception:
+            pass
+    return {}
+
 def upsert_external_playlist(info: dict):
     data = load_session()
     ext = [p for p in data.get("external_playlists", []) if p.get("id") != info["id"]]
@@ -93,6 +103,28 @@ def get_sessions():
 
 config, spotify_session, tidal_session = get_sessions()
 
+@st.cache_resource
+def start_auto_sync_scheduler(config: dict):
+    return _auto_sync.start_scheduler(
+        config,
+        session_file=SESSION_FILE,
+        status_file=AUTO_SYNC_STATUS_FILE,
+    )
+
+start_auto_sync_scheduler(config)
+
+if (config.get("auto_sync") or {}).get("enabled", False):
+    auto_status = load_auto_sync_status()
+    with st.sidebar:
+        st.caption("Daily auto-sync")
+        st.write(auto_status.get("state", "starting"))
+        if auto_status.get("next_run_at"):
+            st.caption(f"Next: {auto_status['next_run_at']}")
+        if auto_status.get("last_run_at"):
+            st.caption(f"Last: {auto_status['last_run_at']}")
+        if auto_status.get("error"):
+            st.error(auto_status["error"])
+
 # ── Data fetchers ─────────────────────────────────────────────────────────────
 @st.cache_data
 def fetch_my_playlists():
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..056b0b5
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,11 @@
+services:
+  spotify-to-tidal:
+    build: .
+    container_name: spotify-to-tidal
+    restart: unless-stopped
+    ports:
+      - "8501:8501"
+    environment:
+      TZ: Europe/Berlin
+    volumes:
+      - ./:/app
diff --git a/example_config.yml b/example_config.yml
index e03971d..6a6b2f2 100644
--- a/example_config.yml
+++ b/example_config.yml
@@ -20,6 +20,16 @@ spotify:
 #   - when false: favorites can only be synced manually via --sync-favorites argument
 sync_favorites_default: true
 
+# unattended Streamlit/Docker sync
+# The daily job syncs playlists marked with "Watch" in the Streamlit app.
+auto_sync:
+  enabled: false
+  daily_at: "03:00"
+  timezone: Europe/Berlin
+  run_on_startup: false
+  sync_external: false
+  sync_favorites: false
+
 # increasing these parameters should increase the search speed, while decreasing reduces likelihood of 429 errors
 max_concurrency: 10 # max concurrent connections at any given time
 rate_limit:      10 # max sustained connections per second
diff --git a/pyproject.toml b/pyproject.toml
index 23705e5..0e1438b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,6 +11,8 @@ dependencies = [
   "spotipy~=2.24",
   "tidalapi~=0.8.10",
   "pyyaml~=6.0",
+  "streamlit~=1.55",
+  "pandas~=2.3",
   "tqdm~=4.64",
   "sqlalchemy~=2.0",
   "pytest~=8.0",
diff --git a/readme.md b/readme.md
index 38f9d2d..ba2fbfe 100644
--- a/readme.md
+++ b/readme.md
@@ -39,6 +39,33 @@ spotify_to_tidal --sync-favorites
 
 See example_config.yml for more configuration options, and `spotify_to_tidal --help` for more options.
 
+Streamlit + Docker auto-sync
+----------------------------
+The Streamlit app can run a daily background sync while it is open in Docker.
+It syncs the playlists marked with "Watch" in the app.
+
+Enable it in `config.yml`:
+
+```yaml
+auto_sync:
+  enabled: true
+  daily_at: "03:00"
+  timezone: Europe/Berlin
+  run_on_startup: false
+  sync_external: false
+  sync_favorites: false
+```
+
+Then start the local container:
+
+```bash
+docker compose up -d --build
+```
+
+Open the app at http://localhost:8501. The container mounts the project folder
+so `config.yml`, `session.json`, `.session.yml`, `.cache-*`, and the auto-sync
+status file persist on your machine.
+
 ---
 
 #### Join our amazing community as a code contributor
diff --git a/session.json b/session.json
index 1160e2e..e366490 100644
--- a/session.json
+++ b/session.json
@@ -5,9 +5,11 @@
     "3Sjb6ZlsPxIpzOMZVoq1pW",
     "3eNcChQ2KssR8QjuV7KUEc",
     "44Shnwiw8xk3UmKf7Unp6o",
+    "44WFxhrnNsa31xnaNul8OK",
     "4ISU1ED9Vx8SH8o3JQVttw",
     "4iVWLq7tdRfLzTbKsYhM56",
     "5d49VR3snvfwyAJxJgB20s",
+    "74jNACuelmkmwkBNn6E463",
     "7KG4kWpAQMhJxudcO42YkG"
   ],
   "external_playlists": [
diff --git a/src/spotify_to_tidal/auto_sync.py b/src/spotify_to_tidal/auto_sync.py
new file mode 100644
index 0000000..7aa82f7
--- /dev/null
+++ b/src/spotify_to_tidal/auto_sync.py
@@ -0,0 +1,174 @@
+import asyncio
+import datetime as dt
+import json
+import threading
+import time
+import traceback
+from pathlib import Path
+from zoneinfo import ZoneInfo
+
+from . import auth as _auth
+from . import sync as _sync
+
+
+DEFAULT_SESSION_FILE = Path("session.json")
+DEFAULT_STATUS_FILE = Path("auto_sync_status.json")
+
+
+def _load_json(path: Path, fallback: dict) -> dict:
+    if not path.exists():
+        return fallback
+    try:
+        return json.loads(path.read_text())
+    except Exception:
+        return fallback
+
+
+def _write_status(path: Path, **updates):
+    status = _load_json(path, {})
+    status.update(updates)
+    status["updated_at"] = dt.datetime.now(dt.timezone.utc).isoformat()
+    path.write_text(json.dumps(status, indent=2))
+
+
+def _get_timezone(name: str | None):
+    if not name:
+        return dt.datetime.now().astimezone().tzinfo
+    try:
+        return ZoneInfo(name)
+    except Exception:
+        return dt.datetime.now().astimezone().tzinfo
+
+
+def _parse_daily_time(value: str | None) -> dt.time:
+    if not value:
+        return dt.time(hour=3)
+    hour, minute = value.split(":", 1)
+    return dt.time(hour=int(hour), minute=int(minute))
+
+
+def _next_daily_run(now: dt.datetime, daily_at: dt.time) -> dt.datetime:
+    run_at = now.replace(
+        hour=daily_at.hour,
+        minute=daily_at.minute,
+        second=0,
+        microsecond=0,
+    )
+    if run_at <= now:
+        run_at += dt.timedelta(days=1)
+    return run_at
+
+
+def _sleep_until(target: dt.datetime, stop_event: threading.Event):
+    while not stop_event.is_set():
+        remaining = (target - dt.datetime.now(target.tzinfo)).total_seconds()
+        if remaining <= 0:
+            return
+        stop_event.wait(min(remaining, 60))
+
+
+async def _sync_configured_targets(config: dict, session_file: Path) -> dict:
+    auto_config = config.get("auto_sync") or {}
+    state = _load_json(session_file, {"watched": [], "external_playlists": []})
+
+    spotify_session = _auth.open_spotify_session(config["spotify"])
+    tidal_session = _auth.open_tidal_session()
+    if not tidal_session.check_login():
+        raise RuntimeError("Could not connect to Tidal")
+
+    watched_ids = set(state.get("watched") or [])
+    all_spotify_playlists = await _sync.get_playlists_from_spotify(spotify_session, config)
+    playlists = [p for p in all_spotify_playlists if p["id"] in watched_ids]
+
+    if auto_config.get("sync_external", False):
+        for item in state.get("external_playlists") or []:
+            pid = item.get("id")
+            if pid and pid not in {p["id"] for p in playlists}:
+                playlists.append(spotify_session.playlist(pid))
+
+    tidal_map = {p.name: p for p in await _sync.get_all_playlists(tidal_session.user)}
+    skipped = []
+    for playlist in playlists:
+        try:
+            await _sync.sync_playlist(
+                spotify_session,
+                tidal_session,
+                playlist,
+                tidal_map.get(playlist["name"]),
+                config,
+            )
+        except RuntimeError as exc:
+            skipped.append({"playlist": playlist["name"], "error": str(exc)})
+
+    favorites_synced = False
+    if auto_config.get("sync_favorites", False):
+        await _sync.sync_favorites(spotify_session, tidal_session, config)
+        favorites_synced = True
+
+    return {
+        "playlist_count": len(playlists),
+        "skipped": skipped,
+        "favorites_synced": favorites_synced,
+    }
+
+
+def run_once(config: dict, session_file: Path = DEFAULT_SESSION_FILE, status_file: Path = DEFAULT_STATUS_FILE):
+    started_at = dt.datetime.now(dt.timezone.utc).isoformat()
+    _write_status(status_file, state="running", started_at=started_at, error=None)
+    try:
+        result = asyncio.run(_sync_configured_targets(config, session_file))
+    except Exception as exc:
+        _write_status(
+            status_file,
+            state="failed",
+            last_run_at=started_at,
+            error=str(exc),
+            traceback=traceback.format_exc(),
+        )
+        raise
+    _write_status(
+        status_file,
+        state="idle",
+        last_run_at=started_at,
+        error=None,
+        **result,
+    )
+
+
+def start_scheduler(
+    config: dict,
+    session_file: Path = DEFAULT_SESSION_FILE,
+    status_file: Path = DEFAULT_STATUS_FILE,
+) -> threading.Event | None:
+    auto_config = config.get("auto_sync") or {}
+    if not auto_config.get("enabled", False):
+        return None
+
+    stop_event = threading.Event()
+    timezone = _get_timezone(auto_config.get("timezone"))
+    daily_at = _parse_daily_time(auto_config.get("daily_at", "03:00"))
+    run_on_startup = auto_config.get("run_on_startup", False)
+
+    def _loop():
+        _write_status(status_file, state="idle", error=None)
+        if run_on_startup and not stop_event.is_set():
+            try:
+                run_once(config, session_file, status_file)
+            except Exception:
+                pass
+
+        while not stop_event.is_set():
+            now = dt.datetime.now(timezone)
+            next_run = _next_daily_run(now, daily_at)
+            _write_status(status_file, state="idle", next_run_at=next_run.isoformat())
+            _sleep_until(next_run, stop_event)
+            if stop_event.is_set():
+                break
+            try:
+                run_once(config, session_file, status_file)
+            except Exception:
+                time.sleep(60)
+
+    thread = threading.Thread(target=_loop, name="spotify-to-tidal-auto-sync", daemon=True)
+    thread.start()
+    return stop_event