diff --git a/app/__init__.py b/app/__init__.py
new file mode 100644
index 0000000..c74d306
--- /dev/null
+++ b/app/__init__.py
@@ -0,0 +1,5 @@
+"""
+mc-webui - Flask application package
+"""
+
+__version__ = "0.1.0"
diff --git a/app/config.py b/app/config.py
new file mode 100644
index 0000000..c09ad7f
--- /dev/null
+++ b/app/config.py
@@ -0,0 +1,46 @@
+"""
+Configuration module - loads settings from environment variables
+"""
+
+import os
+from pathlib import Path
+
+
+class Config:
+    """Application configuration from environment variables"""
+
+    # MeshCore device configuration
+    MC_SERIAL_PORT = os.getenv('MC_SERIAL_PORT', '/dev/ttyUSB0')
+    MC_DEVICE_NAME = os.getenv('MC_DEVICE_NAME', 'MeshCore')
+    MC_CONFIG_DIR = os.getenv('MC_CONFIG_DIR', '/root/.config/meshcore')
+
+    # Application settings
+    MC_REFRESH_INTERVAL = int(os.getenv('MC_REFRESH_INTERVAL', '60'))
+    MC_INACTIVE_HOURS = int(os.getenv('MC_INACTIVE_HOURS', '48'))
+
+    # Flask server configuration
+    FLASK_HOST = os.getenv('FLASK_HOST', '0.0.0.0')
+    FLASK_PORT = int(os.getenv('FLASK_PORT', '5000'))
+    FLASK_DEBUG = os.getenv('FLASK_DEBUG', 'false').lower() == 'true'
+
+    # Derived paths
+    @property
+    def msgs_file_path(self) -> Path:
+        """Get the full path to the .msgs file"""
+        return Path(self.MC_CONFIG_DIR) / f"{self.MC_DEVICE_NAME}.msgs"
+
+    @property
+    def meshcli_command(self) -> list:
+        """Get the base meshcli command with serial port"""
+        return ['meshcli', '-s', self.MC_SERIAL_PORT]
+
+    def __repr__(self):
+        return (
+            f"Config(device={self.MC_DEVICE_NAME}, "
+            f"port={self.MC_SERIAL_PORT}, "
+            f"config_dir={self.MC_CONFIG_DIR})"
+        )
+
+
+# Global config instance
+config = Config()
diff --git a/app/main.py b/app/main.py
new file mode 100644
index 0000000..7ec0800
--- /dev/null
+++ b/app/main.py
@@ -0,0 +1,45 @@
+"""
+mc-webui - Flask application entry point
+"""
+
+import logging
+from flask import Flask
+from app.config import config
+from app.routes.views import views_bp
+from app.routes.api import api_bp
+
+# Configure logging
+logging.basicConfig(
+    level=logging.DEBUG if config.FLASK_DEBUG else logging.INFO,
+    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
+)
+
+logger = logging.getLogger(__name__)
+
+
+def create_app():
+    """Create and configure Flask application"""
+    app = Flask(__name__)
+
+    # Load configuration
+    app.config['DEBUG'] = config.FLASK_DEBUG
+    app.config['SECRET_KEY'] = 'mc-webui-secret-key-change-in-production'
+
+    # Register blueprints
+    app.register_blueprint(views_bp)
+    app.register_blueprint(api_bp)
+
+    logger.info(f"mc-webui started - device: {config.MC_DEVICE_NAME}")
+    logger.info(f"Messages file: {config.msgs_file_path}")
+    logger.info(f"Serial port: {config.MC_SERIAL_PORT}")
+
+    return app
+
+
+if __name__ == '__main__':
+    app = create_app()
+    app.run(
+        host=config.FLASK_HOST,
+        port=config.FLASK_PORT,
+        debug=config.FLASK_DEBUG
+    )
diff --git a/app/meshcore/__init__.py b/app/meshcore/__init__.py
new file mode 100644
index 0000000..31e0fb0
--- /dev/null
+++ b/app/meshcore/__init__.py
@@ -0,0 +1,3 @@
+"""
+MeshCore integration package - CLI wrapper and message parser
+"""
diff --git a/app/meshcore/cli.py b/app/meshcore/cli.py
new file mode 100644
index 0000000..45da771
--- /dev/null
+++ b/app/meshcore/cli.py
@@ -0,0 +1,146 @@
+"""
+MeshCore CLI wrapper - executes meshcli commands via subprocess
+"""
+
+import subprocess
+import logging
+from typing import Tuple, Optional
+from app.config import config
+
+logger = logging.getLogger(__name__)
+
+# Command timeout in seconds
+DEFAULT_TIMEOUT = 30
+RECV_TIMEOUT = 60  # recv can take longer
+
+
+class MeshCLIError(Exception):
+    """Custom exception for meshcli command failures"""
+    pass
+
+
+def _run_command(args: list, timeout: int = DEFAULT_TIMEOUT) -> Tuple[bool, str, str]:
+    """
+    Execute a meshcli command and return result.
+
+    Args:
+        args: Command arguments (will be prepended with meshcli -s <port>)
+        timeout: Command timeout in seconds
+
+    Returns:
+        Tuple of (success, stdout, stderr)
+    """
+    cmd = config.meshcli_command + args
+    logger.info(f"Executing: {' '.join(cmd)}")
+
+    try:
+        result = subprocess.run(
+            cmd,
+            capture_output=True,
+            text=True,
+            timeout=timeout,
+            check=False
+        )
+
+        success = result.returncode == 0
+        stdout = result.stdout.strip()
+        stderr = result.stderr.strip()
+
+        if not success:
+            logger.warning(f"Command failed: {stderr or stdout}")
+
+        return success, stdout, stderr
+
+    except subprocess.TimeoutExpired:
+        logger.error(f"Command timeout after {timeout}s: {' '.join(cmd)}")
+        return False, "", f"Command timeout after {timeout}s"
+
+    except FileNotFoundError:
+        logger.error("meshcli command not found")
+        return False, "", "meshcli not found - is meshcore-cli installed?"
+
+    except Exception as e:
+        logger.error(f"Unexpected error: {e}")
+        return False, "", str(e)
+
+
+def recv_messages() -> Tuple[bool, str]:
+    """
+    Fetch new messages from the device.
+
+    Returns:
+        Tuple of (success, message)
+    """
+    success, stdout, stderr = _run_command(['recv'], timeout=RECV_TIMEOUT)
+    return success, stdout or stderr
+
+
+def send_message(text: str, reply_to: Optional[str] = None) -> Tuple[bool, str]:
+    """
+    Send a message to the Public channel.
+
+    Args:
+        text: Message content
+        reply_to: Optional username to reply to (will format as @[username])
+
+    Returns:
+        Tuple of (success, message)
+    """
+    if reply_to:
+        message = f"@[{reply_to}] {text}"
+    else:
+        message = text
+
+    success, stdout, stderr = _run_command(['public', message])
+    return success, stdout or stderr
+
+
+def get_contacts() -> Tuple[bool, str]:
+    """
+    Get list of contacts from the device.
+
+    Returns:
+        Tuple of (success, output)
+    """
+    success, stdout, stderr = _run_command(['contacts'])
+    return success, stdout or stderr
+
+
+def clean_inactive_contacts(hours: int = 48) -> Tuple[bool, str]:
+    """
+    Remove contacts inactive for specified hours.
+
+    Args:
+        hours: Inactivity threshold in hours
+
+    Returns:
+        Tuple of (success, message)
+    """
+    # Command format: apply_to u<48h,t=1 remove_contact
+    # u<48h = updated less than 48h ago (inactive)
+    # t=1 = type client (not router/repeater)
+    filter_cmd = f"u<{hours}h,t=1"
+    success, stdout, stderr = _run_command(['apply_to', filter_cmd, 'remove_contact'])
+    return success, stdout or stderr
+
+
+def get_device_info() -> Tuple[bool, str]:
+    """
+    Get device information.
+
+    Returns:
+        Tuple of (success, info)
+    """
+    success, stdout, stderr = _run_command(['infos'])
+    return success, stdout or stderr
+
+
+def check_connection() -> bool:
+    """
+    Quick check if device is accessible.
+
+    Returns:
+        True if device responds, False otherwise
+    """
+    success, _, _ = _run_command(['infos'], timeout=5)
+    return success
diff --git a/app/meshcore/parser.py b/app/meshcore/parser.py
new file mode 100644
index 0000000..1c6ac76
--- /dev/null
+++ b/app/meshcore/parser.py
@@ -0,0 +1,149 @@
+"""
+Message parser - reads and parses .msgs file (JSON Lines format)
+"""
+
+import json
+import logging
+from pathlib import Path
+from typing import List, Dict, Optional
+from datetime import datetime
+from app.config import config
+
+logger = logging.getLogger(__name__)
+
+
+def parse_message(line: Dict) -> Optional[Dict]:
+    """
+    Parse a single message line from .msgs file.
+
+    Args:
+        line: Raw JSON object from .msgs file
+
+    Returns:
+        Parsed message dict or None if not a valid chat message
+    """
+    msg_type = line.get('type')
+    channel_idx = line.get('channel_idx', 0)
+
+    # Only process Public channel (channel 0) messages
+    if channel_idx != 0:
+        return None
+
+    # Only process CHAN (received) and SENT_CHAN (sent) messages
+    if msg_type not in ['CHAN', 'SENT_CHAN']:
+        return None
+
+    timestamp = line.get('timestamp', 0)
+    text = line.get('text', '').strip()
+
+    if not text:
+        return None
+
+    # Determine if message is sent or received
+    is_own = msg_type == 'SENT_CHAN'
+
+    # Extract sender name
+    if is_own:
+        # For sent messages, use device name from config or 'name' field
+        sender = line.get('name', config.MC_DEVICE_NAME)
+        content = text
+    else:
+        # For received messages, extract sender from "SenderName: message" format
+        if ':' in text:
+            sender, content = text.split(':', 1)
+            sender = sender.strip()
+            content = content.strip()
+        else:
+            # Fallback if format is unexpected
+            sender = "Unknown"
+            content = text
+
+    return {
+        'sender': sender,
+        'content': content,
+        'timestamp': timestamp,
+        'datetime': datetime.fromtimestamp(timestamp).isoformat() if timestamp > 0 else None,
+        'is_own': is_own,
+        'snr': line.get('SNR'),
+        'path_len': line.get('path_len')
+    }
+
+
+def read_messages(limit: Optional[int] = None, offset: int = 0) -> List[Dict]:
+    """
+    Read and parse messages from .msgs file.
+
+    Args:
+        limit: Maximum number of messages to return (None = all)
+        offset: Number of messages to skip from the end
+
+    Returns:
+        List of parsed message dictionaries, sorted by timestamp (oldest first)
+    """
+    msgs_file = config.msgs_file_path
+
+    if not msgs_file.exists():
+        logger.warning(f"Messages file not found: {msgs_file}")
+        return []
+
+    messages = []
+
+    try:
+        with open(msgs_file, 'r', encoding='utf-8') as f:
+            for line_num, line in enumerate(f, 1):
+                line = line.strip()
+                if not line:
+                    continue
+
+                try:
+                    data = json.loads(line)
+                    parsed = parse_message(data)
+                    if parsed:
+                        messages.append(parsed)
+                except json.JSONDecodeError as e:
+                    logger.warning(f"Invalid JSON at line {line_num}: {e}")
+                    continue
+                except Exception as e:
+                    logger.error(f"Error parsing line {line_num}: {e}")
+                    continue
+
+    except FileNotFoundError:
+        logger.error(f"Messages file not found: {msgs_file}")
+        return []
+    except Exception as e:
+        logger.error(f"Error reading messages file: {e}")
+        return []
+
+    # Sort by timestamp (oldest first)
+    messages.sort(key=lambda m: m['timestamp'])
+
+    # Apply offset and limit
+    if offset > 0:
+        messages = messages[:-offset] if offset < len(messages) else []
+
+    if limit is not None and limit > 0:
+        messages = messages[-limit:]
+
+    logger.info(f"Loaded {len(messages)} messages from {msgs_file}")
+    return messages
+
+
+def get_latest_message() -> Optional[Dict]:
+    """
+    Get the most recent message.
+
+    Returns:
+        Latest message dict or None if no messages
+    """
+    messages = read_messages(limit=1)
+    return messages[0] if messages else None
+
+
+def count_messages() -> int:
+    """
+    Count total number of messages in the file.
+
+    Returns:
+        Message count
+    """
+    return len(read_messages())
diff --git a/app/routes/__init__.py b/app/routes/__init__.py
new file mode 100644
index 0000000..3607e15
--- /dev/null
+++ b/app/routes/__init__.py
@@ -0,0 +1,3 @@
+"""
+Flask routes - API endpoints and HTML views
+"""
diff --git a/app/routes/api.py b/app/routes/api.py
new file mode 100644
index 0000000..04253a3
--- /dev/null
+++ b/app/routes/api.py
@@ -0,0 +1,237 @@
+"""
+REST API endpoints for mc-webui
+"""
+
+import logging
+from flask import Blueprint, jsonify, request
+from app.meshcore import cli, parser
+from app.config import config
+
+logger = logging.getLogger(__name__)
+
+api_bp = Blueprint('api', __name__, url_prefix='/api')
+
+
+@api_bp.route('/messages', methods=['GET'])
+def get_messages():
+    """
+    Get list of messages from Public channel.
+
+    Query parameters:
+        limit (int): Maximum number of messages to return
+        offset (int): Number of messages to skip from the end
+
+    Returns:
+        JSON with messages list
+    """
+    try:
+        limit = request.args.get('limit', type=int)
+        offset = request.args.get('offset', default=0, type=int)
+
+        messages = parser.read_messages(limit=limit, offset=offset)
+
+        return jsonify({
+            'success': True,
+            'count': len(messages),
+            'messages': messages
+        }), 200
+
+    except Exception as e:
+        logger.error(f"Error fetching messages: {e}")
+        return jsonify({
+            'success': False,
+            'error': str(e)
+        }), 500
+
+
+@api_bp.route('/messages', methods=['POST'])
+def send_message():
+    """
+    Send a message to the Public channel.
+
+    JSON body:
+        text (str): Message content (required)
+        reply_to (str): Username to reply to (optional)
+
+    Returns:
+        JSON with success status
+    """
+    try:
+        data = request.get_json()
+
+        if not data or 'text' not in data:
+            return jsonify({
+                'success': False,
+                'error': 'Missing required field: text'
+            }), 400
+
+        text = data['text'].strip()
+        if not text:
+            return jsonify({
+                'success': False,
+                'error': 'Message text cannot be empty'
+            }), 400
+
+        reply_to = data.get('reply_to')
+
+        # Send message via meshcli
+        success, message = cli.send_message(text, reply_to=reply_to)
+
+        if success:
+            return jsonify({
+                'success': True,
+                'message': 'Message sent successfully'
+            }), 200
+        else:
+            return jsonify({
+                'success': False,
+                'error': message
+            }), 500
+
+    except Exception as e:
+        logger.error(f"Error sending message: {e}")
+        return jsonify({
+            'success': False,
+            'error': str(e)
+        }), 500
+
+
+@api_bp.route('/status', methods=['GET'])
+def get_status():
+    """
+    Get device connection status and basic info.
+
+    Returns:
+        JSON with status information
+    """
+    try:
+        # Check if device is accessible
+        connected = cli.check_connection()
+
+        # Get message count
+        message_count = parser.count_messages()
+
+        # Get latest message timestamp
+        latest = parser.get_latest_message()
+        latest_timestamp = latest['timestamp'] if latest else None
+
+        return jsonify({
+            'success': True,
+            'connected': connected,
+            'device_name': config.MC_DEVICE_NAME,
+            'serial_port': config.MC_SERIAL_PORT,
+            'message_count': message_count,
+            'latest_message_timestamp': latest_timestamp,
+            'refresh_interval': config.MC_REFRESH_INTERVAL
+        }), 200
+
+    except Exception as e:
+        logger.error(f"Error getting status: {e}")
+        return jsonify({
+            'success': False,
+            'error': str(e)
+        }), 500
+
+
+@api_bp.route('/contacts/cleanup', methods=['POST'])
+def cleanup_contacts():
+    """
+    Clean up inactive contacts.
+
+    JSON body:
+        hours (int): Inactivity threshold in hours (optional, default from config)
+
+    Returns:
+        JSON with cleanup result
+    """
+    try:
+        data = request.get_json() or {}
+        hours = data.get('hours', config.MC_INACTIVE_HOURS)
+
+        if not isinstance(hours, int) or hours < 1:
+            return jsonify({
+                'success': False,
+                'error': 'Invalid hours value (must be positive integer)'
+            }), 400
+
+        # Execute cleanup command
+        success, message = cli.clean_inactive_contacts(hours)
+
+        if success:
+            return jsonify({
+                'success': True,
+                'message': f'Cleanup completed: {message}',
+                'hours': hours
+            }), 200
+        else:
+            return jsonify({
+                'success': False,
+                'error': message
+            }), 500
+
+    except Exception as e:
+        logger.error(f"Error cleaning contacts: {e}")
+        return jsonify({
+            'success': False,
+            'error': str(e)
+        }), 500
+
+
+@api_bp.route('/device/info', methods=['GET'])
+def get_device_info():
+    """
+    Get detailed device information.
+
+    Returns:
+        JSON with device info
+    """
+    try:
+        success, info = cli.get_device_info()
+
+        if success:
+            return jsonify({
+                'success': True,
+                'info': info
+            }), 200
+        else:
+            return jsonify({
+                'success': False,
+                'error': info
+            }), 500
+
+    except Exception as e:
+        logger.error(f"Error getting device info: {e}")
+        return jsonify({
+            'success': False,
+            'error': str(e)
+        }), 500
+
+
+@api_bp.route('/sync', methods=['POST'])
+def sync_messages():
+    """
+    Trigger message sync from device.
+
+    Returns:
+        JSON with sync result
+    """
+    try:
+        success, message = cli.recv_messages()
+
+        if success:
+            return jsonify({
+                'success': True,
+                'message': 'Messages synced successfully'
+            }), 200
+        else:
+            return jsonify({
+                'success': False,
+                'error': message
+            }), 500
+
+    except Exception as e:
+        logger.error(f"Error syncing messages: {e}")
+        return jsonify({
+            'success': False,
+            'error': str(e)
+        }), 500
diff --git a/app/routes/views.py b/app/routes/views.py
new file mode 100644
index 0000000..d728bcd
--- /dev/null
+++ b/app/routes/views.py
@@ -0,0 +1,31 @@
+"""
+HTML views for mc-webui
+"""
+
+import logging
+from flask import Blueprint, render_template
+from app.config import config
+
+logger = logging.getLogger(__name__)
+
+views_bp = Blueprint('views', __name__)
+
+
+@views_bp.route('/')
+def index():
+    """
+    Main chat view - displays message list and send form.
+    """
+    return render_template(
+        'index.html',
+        device_name=config.MC_DEVICE_NAME,
+        refresh_interval=config.MC_REFRESH_INTERVAL
+    )
+
+
+@views_bp.route('/health')
+def health():
+    """
+    Health check endpoint for monitoring.
+    """
+    return 'OK', 200
diff --git a/app/static/css/style.css b/app/static/css/style.css
new file mode 100644
index 0000000..bfa18ff
--- /dev/null
+++ b/app/static/css/style.css
@@ -0,0 +1,186 @@
+/* mc-webui Custom Styles */
+
+:root {
+    --msg-own-bg: #e7f1ff;
+    --msg-other-bg: #f8f9fa;
+    --msg-border: #dee2e6;
+}
+
+/* Page Layout */
+html, body {
+    height: 100vh;
+    margin: 0;
+    overflow: hidden;
+}
+
+body {
+    display: flex;
+    flex-direction: column;
+}
+
+main {
+    flex: 1;
+    overflow: hidden;
+    display: flex;
+    flex-direction: column;
+}
+
+/* Messages Container */
+.messages-container {
+    background-color: #ffffff;
+}
+
+#messagesList {
+    display: flex;
+    flex-direction: column;
+    gap: 0.75rem;
+}
+
+/* Message Bubbles */
+.message {
+    max-width: 70%;
+    padding: 0.75rem 1rem;
+    border-radius: 1rem;
+    border: 1px solid var(--msg-border);
+    word-wrap: break-word;
+    animation: fadeIn 0.3s ease-in;
+}
+
+@keyframes fadeIn {
+    from { opacity: 0; transform: translateY(10px); }
+    to { opacity: 1; transform: translateY(0); }
+}
+
+/* Own Messages (right-aligned) */
+.message.own {
+    align-self: flex-end;
+    background-color: var(--msg-own-bg);
+    border-color: #b8daff;
+}
+
+/* Other Messages (left-aligned) */
+.message.other {
+    align-self: flex-start;
+    background-color: var(--msg-other-bg);
+}
+
+/* Message Header */
+.message-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 0.25rem;
+    font-size: 0.875rem;
+}
+
+.message-sender {
+    font-weight: 600;
+    color: #0d6efd;
+}
+
+.message.own .message-sender {
+    color: #084298;
+}
+
+.message-time {
+    font-size: 0.75rem;
+    color: #6c757d;
+}
+
+/* Message Content */
+.message-content {
+    margin: 0;
+    white-space: pre-wrap;
+    line-height: 1.4;
+}
+
+/* Message Metadata */
+.message-meta {
+    font-size: 0.7rem;
+    color: #adb5bd;
+    margin-top: 0.25rem;
+}
+
+/* Reply Button */
+.btn-reply {
+    font-size: 0.7rem;
+    padding: 0.1rem 0.4rem;
+    margin-top: 0.25rem;
+}
+
+/* Send Form */
+#messageInput {
+    resize: none;
+    border-radius: 0.5rem 0 0 0.5rem;
+}
+
+#sendBtn {
+    border-radius: 0 0.5rem 0.5rem 0;
+}
+
+/* Status Indicators */
+.status-connected {
+    color: #198754 !important;
+}
+
+.status-disconnected {
+    color: #dc3545 !important;
+}
+
+.status-connecting {
+    color: #ffc107 !important;
+}
+
+/* Scrollbar Styling */
+.messages-container::-webkit-scrollbar {
+    width: 8px;
+}
+
+.messages-container::-webkit-scrollbar-track {
+    background: #f1f1f1;
+}
+
+.messages-container::-webkit-scrollbar-thumb {
+    background: #888;
+    border-radius: 4px;
+}
+
+.messages-container::-webkit-scrollbar-thumb:hover {
+    background: #555;
+}
+
+/* Responsive Design */
+@media (max-width: 768px) {
+    .message {
+        max-width: 85%;
+    }
+
+    .message-header {
+        font-size: 0.8rem;
+    }
+
+    #messageInput {
+        font-size: 0.9rem;
+    }
+}
+
+/* Loading State */
+.loading-spinner {
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    height: 100%;
+}
+
+/* Empty State */
+.empty-state {
+    text-align: center;
+    padding: 3rem 1rem;
+    color: #6c757d;
+}
+
+.empty-state i {
+    font-size: 3rem;
+    margin-bottom: 1rem;
+    opacity: 0.5;
+}
diff --git a/app/static/js/app.js b/app/static/js/app.js
new file mode 100644
index 0000000..3d4cc37
--- /dev/null
+++ b/app/static/js/app.js
@@ -0,0 +1,372 @@
+/**
+ * mc-webui Frontend Application
+ */
+
+// Global state
+let lastMessageCount = 0;
+let autoRefreshInterval = null;
+let isUserScrolling = false;
+
+// Initialize on page load
+document.addEventListener('DOMContentLoaded', function() {
+    console.log('mc-webui initialized');
+
+    // Load initial messages
+    loadMessages();
+
+    // Setup auto-refresh
+    setupAutoRefresh();
+
+    // Setup event listeners
+    setupEventListeners();
+
+    // Load device status
+    loadStatus();
+});
+
+/**
+ * Setup event listeners
+ */
+function setupEventListeners() {
+    // Send message form
+    const form = document.getElementById('sendMessageForm');
+    const input = document.getElementById('messageInput');
+
+    form.addEventListener('submit', function(e) {
+        e.preventDefault();
+        sendMessage();
+    });
+
+    // Handle Enter key (send) vs Shift+Enter (new line)
+    input.addEventListener('keydown', function(e) {
+        if (e.key === 'Enter' && !e.shiftKey) {
+            e.preventDefault();
+            sendMessage();
+        }
+    });
+
+    // Manual refresh button
+    document.getElementById('refreshBtn').addEventListener('click', function() {
+        loadMessages();
+    });
+
+    // Cleanup contacts button
+    document.getElementById('cleanupBtn').addEventListener('click', function() {
+        cleanupContacts();
+    });
+
+    // Track user scrolling
+    const container = document.getElementById('messagesContainer');
+    container.addEventListener('scroll', function() {
+        const isAtBottom = container.scrollHeight - container.scrollTop <= container.clientHeight + 100;
+        isUserScrolling = !isAtBottom;
+    });
+
+    // Load device info when settings modal opens
+    const settingsModal = document.getElementById('settingsModal');
+    settingsModal.addEventListener('show.bs.modal', function() {
+        loadDeviceInfo();
+    });
+}
+
+/**
+ * Load messages from API
+ */
+async function loadMessages() {
+    try {
+        const response = await fetch('/api/messages?limit=100');
+        const data = await response.json();
+
+        if (data.success) {
+            displayMessages(data.messages);
+            updateStatus('connected');
+            updateLastRefresh();
+        } else {
+            showNotification('Error loading messages: ' + data.error, 'danger');
+        }
+    } catch (error) {
+        console.error('Error loading messages:', error);
+        updateStatus('disconnected');
+        showNotification('Failed to load messages', 'danger');
+    }
+}
+
+/**
+ * Display messages in the UI
+ */
+function displayMessages(messages) {
+    const container = document.getElementById('messagesList');
+    const wasAtBottom = !isUserScrolling;
+
+    // Clear loading spinner
+    container.innerHTML = '';
+
+    if (messages.length === 0) {
+        container.innerHTML = `
+            <div class="empty-state">
+                <i class="bi bi-chat-dots"></i>
+                <p>No messages yet</p>
+                <small>Send a message to get started!</small>
+            </div>
+        `;
+        return;
+    }
+
+    // Render each message
+    messages.forEach(msg => {
+        const messageEl = createMessageElement(msg);
+        container.appendChild(messageEl);
+    });
+
+    // Auto-scroll to bottom if user wasn't scrolling
+    if (wasAtBottom) {
+        scrollToBottom();
+    }
+
+    lastMessageCount = messages.length;
+}
+
+/**
+ * Create message DOM element
+ */
+function createMessageElement(msg) {
+    const div = document.createElement('div');
+    div.className = `message ${msg.is_own ? 'own' : 'other'}`;
+
+    const time = formatTime(msg.timestamp);
+
+    let metaInfo = '';
+    if (msg.snr !== undefined && msg.snr !== null) {
+        metaInfo += `SNR: ${msg.snr.toFixed(1)} dB`;
+    }
+    if (msg.path_len !== undefined && msg.path_len !== null) {
+        metaInfo += ` | Hops: ${msg.path_len}`;
+    }
+
+    div.innerHTML = `
+        <div class="message-header">
+            <span class="message-sender">${escapeHtml(msg.sender)}</span>
+            <span class="message-time">${time}</span>
+        </div>
+        <p class="message-content">${escapeHtml(msg.content)}</p>
+        ${metaInfo ? `<div class="message-meta">${metaInfo}</div>` : ''}
+        ${!msg.is_own ? `<button class="btn btn-outline-secondary btn-sm btn-reply" onclick="replyTo('${escapeHtml(msg.sender)}')">
+            <i class="bi bi-reply"></i> Reply
+        </button>` : ''}
+    `;
+
+    return div;
+}
+
+/**
+ * Send a message
+ */
+async function sendMessage() {
+    const input = document.getElementById('messageInput');
+    const text = input.value.trim();
+
+    if (!text) return;
+
+    const sendBtn = document.getElementById('sendBtn');
+    sendBtn.disabled = true;
+
+    try {
+        const response = await fetch('/api/messages', {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json'
+            },
+            body: JSON.stringify({ text: text })
+        });
+
+        const data = await response.json();
+
+        if (data.success) {
+            input.value = '';
+            showNotification('Message sent', 'success');
+
+            // Reload messages after short delay
+            setTimeout(() => loadMessages(), 1000);
+        } else {
+            showNotification('Failed to send: ' + data.error, 'danger');
+        }
+    } catch (error) {
+        console.error('Error sending message:', error);
+        showNotification('Failed to send message', 'danger');
+    } finally {
+        sendBtn.disabled = false;
+        input.focus();
+    }
+}
+
+/**
+ * Reply to a user
+ */
+function replyTo(username) {
+    const input = document.getElementById('messageInput');
+    input.value = `@[${username}] `;
+    input.focus();
+}
+
+/**
+ * Load connection status
+ */
+async function loadStatus() {
+    try {
+        const response = await fetch('/api/status');
+        const data = await response.json();
+
+        if (data.success) {
+            updateStatus(data.connected ? 'connected' : 'disconnected');
+        }
+    } catch (error) {
+        console.error('Error loading status:', error);
+        updateStatus('disconnected');
+    }
+}
+
+/**
+ * Load device information
+ */
+async function loadDeviceInfo() {
+    const infoEl = document.getElementById('deviceInfo');
+    infoEl.innerHTML = '<div class="spinner-border spinner-border-sm"></div> Loading...';
+
+    try {
+        const response = await fetch('/api/device/info');
+        const data = await response.json();
+
+        if (data.success) {
+            infoEl.innerHTML = `<pre class="mb-0">${escapeHtml(data.info)}</pre>`;
+        } else {
+            infoEl.innerHTML = `<span class="text-danger">Error: ${escapeHtml(data.error)}</span>`;
+        }
+    } catch (error) {
+        infoEl.innerHTML = '<span class="text-danger">Failed to load device info</span>';
+    }
+}
+
+/**
+ * Cleanup inactive contacts
+ */
+async function cleanupContacts() {
+    const hours = parseInt(document.getElementById('inactiveHours').value);
+
+    if (!confirm(`Remove all contacts inactive for more than ${hours} hours?`)) {
+        return;
+    }
+
+    const btn = document.getElementById('cleanupBtn');
+    btn.disabled = true;
+
+    try {
+        const response = await fetch('/api/contacts/cleanup', {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json'
+            },
+            body: JSON.stringify({ hours: hours })
+        });
+
+        const data = await response.json();
+
+        if (data.success) {
+            showNotification(data.message, 'success');
+        } else {
+            showNotification('Cleanup failed: ' + data.error, 'danger');
+        }
+    } catch (error) {
+        console.error('Error cleaning contacts:', error);
+        showNotification('Cleanup failed', 'danger');
+    } finally {
+        btn.disabled = false;
+    }
+}
+
+/**
+ * Setup auto-refresh
+ */
+function setupAutoRefresh() {
+    const interval = window.MC_CONFIG?.refreshInterval || 60000;
+
+    autoRefreshInterval = setInterval(() => {
+        loadMessages();
+    }, interval);
+
+    console.log(`Auto-refresh enabled: every ${interval / 1000}s`);
+}
+
+/**
+ * Update connection status indicator
+ */
+function updateStatus(status) {
+    const statusEl = document.getElementById('statusText');
+
+    const icons = {
+        connected: '<i class="bi bi-circle-fill status-connected"></i> Connected',
+        disconnected: '<i class="bi bi-circle-fill status-disconnected"></i> Disconnected',
+        connecting: '<i class="bi bi-circle-fill status-connecting"></i> Connecting...'
+    };
+
+    statusEl.innerHTML = icons[status] || icons.connecting;
+}
+
+/**
+ * Update last refresh timestamp
+ */
+function updateLastRefresh() {
+    const now = new Date();
+    const timeStr = now.toLocaleTimeString();
+    document.getElementById('lastRefresh').textContent = `Last refresh: ${timeStr}`;
+}
+
+/**
+ * Show notification toast
+ */
+function showNotification(message, type = 'info') {
+    const toastEl = document.getElementById('notificationToast');
+    const toastBody = toastEl.querySelector('.toast-body');
+
+    toastBody.textContent = message;
+    toastEl.className = `toast bg-${type} text-white`;
+
+    const toast = new bootstrap.Toast(toastEl);
+    toast.show();
+}
+
+/**
+ * Scroll to bottom of messages
+ */
+function scrollToBottom() {
+    const container = document.getElementById('messagesContainer');
+    container.scrollTop = container.scrollHeight;
+}
+
+/**
+ * Format timestamp
+ */
+function formatTime(timestamp) {
+    const date = new Date(timestamp * 1000);
+    const now = new Date();
+    const diffDays = Math.floor((now - date) / (1000 * 60 * 60 * 24));
+
+    if (diffDays === 0) {
+        // Today - show time only
+        return date.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
+    } else if (diffDays === 1) {
+        // Yesterday
+        return 'Yesterday ' + date.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
+    } else {
+        // Older - show date and time
+        return date.toLocaleDateString() + ' ' + date.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
+    }
+}
+
+/**
+ * Escape HTML to prevent XSS
+ */
+function escapeHtml(text) {
+    const div = document.createElement('div');
+    div.textContent = text;
+    return div.innerHTML;
+}
diff --git a/app/templates/base.html b/app/templates/base.html
new file mode 100644
index 0000000..9b1de4a
--- /dev/null
+++ b/app/templates/base.html
@@ -0,0 +1,94 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>{% block title %}mc-webui{% endblock %}</title>
+
+    <!-- Bootstrap 5 CSS -->
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet">
+    <!-- Bootstrap Icons -->
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.2/font/bootstrap-icons.css">
+
+    <!-- Custom CSS -->
+    <link rel="stylesheet" href="{{ url_for('static', filename='css/style.css') }}">
+
+    {% block extra_head %}{% endblock %}
+</head>
+<body>
+    <!-- Navbar -->
+    <nav class="navbar navbar-dark bg-primary">
+        <div class="container-fluid">
+            <span class="navbar-brand mb-0 h1">
+                <i class="bi bi-broadcast"></i> mc-webui
+                {% if device_name %}
+                <small class="text-white-50">- {{ device_name }}</small>
+                {% endif %}
+            </span>
+            <div class="d-flex align-items-center">
+                <button class="btn btn-outline-light btn-sm me-2" id="refreshBtn" title="Refresh messages">
+                    <i class="bi bi-arrow-clockwise"></i> Refresh
+                </button>
+                <button class="btn btn-outline-light btn-sm" data-bs-toggle="modal" data-bs-target="#settingsModal" title="Settings">
+                    <i class="bi bi-gear"></i>
+                </button>
+            </div>
+        </div>
+    </nav>
+
+    <!-- Main Content -->
+    <main>
+        {% block content %}{% endblock %}
+    </main>
+
+    <!-- Settings Modal -->
+    <div class="modal fade" id="settingsModal" tabindex="-1">
+        <div class="modal-dialog">
+            <div class="modal-content">
+                <div class="modal-header">
+                    <h5 class="modal-title"><i class="bi bi-gear"></i> Settings</h5>
+                    <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
+                </div>
+                <div class="modal-body">
+                    <h6>Contact Management</h6>
+                    <hr>
+                    <div class="mb-3">
+                        <label for="inactiveHours" class="form-label">Remove contacts inactive for:</label>
+                        <div class="input-group">
+                            <input type="number" class="form-control" id="inactiveHours" value="48" min="1">
+                            <span class="input-group-text">hours</span>
+                        </div>
+                    </div>
+                    <button class="btn btn-danger" id="cleanupBtn">
+                        <i class="bi bi-trash"></i> Clean Inactive Contacts
+                    </button>
+                    <hr>
+                    <h6>Device Information</h6>
+                    <div id="deviceInfo" class="small text-muted">
+                        Loading...
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+
+    <!-- Toast container for notifications -->
+    <div class="toast-container position-fixed bottom-0 end-0 p-3">
+        <div id="notificationToast" class="toast" role="alert">
+            <div class="toast-header">
+                <strong class="me-auto">mc-webui</strong>
+                <button type="button" class="btn-close" data-bs-dismiss="toast"></button>
+            </div>
+            <div class="toast-body"></div>
+        </div>
+    </div>
+
+    <!-- Bootstrap 5 JS Bundle -->
+    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js"></script>
+
+    <!-- Custom JS -->
+    <script src="{{ url_for('static', filename='js/app.js') }}"></script>
+
+    {% block extra_scripts %}{% endblock %}
+</body>
+</html>
diff --git a/app/templates/index.html b/app/templates/index.html
new file mode 100644
index 0000000..9e83c67
--- /dev/null
+++ b/app/templates/index.html
@@ -0,0 +1,67 @@
+{% extends "base.html" %}
+
+{% block title %}Chat - mc-webui{% endblock %}
+
+{% block content %}
+<div class="container-fluid h-100 d-flex flex-column">
+    <!-- Messages Container -->
+    <div class="row flex-grow-1 overflow-hidden">
+        <div class="col-12 h-100">
+            <div id="messagesContainer" class="messages-container h-100 overflow-auto p-3">
+                <div id="messagesList">
+                    <!-- Messages will be loaded here via JavaScript -->
+                    <div class="text-center text-muted py-5">
+                        <div class="spinner-border" role="status">
+                            <span class="visually-hidden">Loading...</span>
+                        </div>
+                        <p class="mt-3">Loading messages...</p>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+
+    <!-- Send Message Form -->
+    <div class="row border-top bg-light">
+        <div class="col-12">
+            <form id="sendMessageForm" class="p-3">
+                <div class="input-group">
+                    <textarea
+                        id="messageInput"
+                        class="form-control"
+                        placeholder="Type a message..."
+                        rows="2"
+                        required
+                    ></textarea>
+                    <button type="submit" class="btn btn-primary px-4" id="sendBtn">
+                        <i class="bi bi-send"></i> Send
+                    </button>
+                </div>
+                <small class="text-muted">Press Shift+Enter for new line, Enter to send</small>
+            </form>
+        </div>
+    </div>
+
+    <!-- Status Bar -->
+    <div class="row border-top">
+        <div class="col-12">
+            <div class="p-2 small text-muted d-flex justify-content-between align-items-center">
+                <span id="statusText">
+                    <i class="bi bi-circle-fill text-secondary"></i> Connecting...
+                </span>
+                <span id="lastRefresh">Last refresh: Never</span>
+            </div>
+        </div>
+    </div>
+</div>
+{% endblock %}
+
+{% block extra_scripts %}
+<script>
+    // Pass configuration from Flask to JavaScript
+    window.MC_CONFIG = {
+        refreshInterval: {{ refresh_interval }} * 1000,  // Convert to milliseconds
+        deviceName: "{{ device_name }}"
+    };
+</script>
+{% endblock %}