diff --git a/fastapi_server/server_viewer.py b/fastapi_server/server_viewer.py
new file mode 100644
index 0000000..f41130f
--- /dev/null
+++ b/fastapi_server/server_viewer.py
@@ -0,0 +1,130 @@
+from fastapi import FastAPI, HTTPException
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.responses import HTMLResponse, JSONResponse
+from fastapi.staticfiles import StaticFiles
+from pydantic import BaseModel
+from typing import List, Dict, Optional
+import os
+import sys
+from pathlib import Path
+from dotenv import load_dotenv
+
+load_dotenv()
+
+# Ensure we can import from project root
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from lang_agent.components.conv_store import ConversationStore
+
+app = FastAPI(
+    title="Conversation Viewer",
+    description="Web UI to view conversations from the database",
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Initialize conversation store
+try:
+    conv_store = ConversationStore()
+except ValueError as e:
+    print(f"Warning: {e}. Make sure CONN_STR environment variable is set.")
+    conv_store = None
+
+
+class MessageResponse(BaseModel):
+    message_type: str
+    content: str
+    sequence_number: int
+    created_at: str
+
+
+class ConversationListItem(BaseModel):
+    conversation_id: str
+    message_count: int
+    last_updated: Optional[str] = None
+
+
+@app.get("/", response_class=HTMLResponse)
+async def root():
+    """Serve the main HTML page"""
+    html_path = Path(__file__).parent.parent / "static" / "viewer.html"
+    if html_path.exists():
+        return HTMLResponse(content=html_path.read_text(encoding="utf-8"))
+    else:
+        return HTMLResponse(content="<h1>Viewer HTML not found. Please create static/viewer.html</h1>")
+
+
+@app.get("/api/conversations", response_model=List[ConversationListItem])
+async def list_conversations():
+    """Get list of all conversations"""
+    if conv_store is None:
+        raise HTTPException(status_code=500, detail="Database connection not configured")
+    
+    import psycopg
+    conn_str = os.environ.get("CONN_STR")
+    if not conn_str:
+        raise HTTPException(status_code=500, detail="CONN_STR not set")
+    
+    with psycopg.connect(conn_str) as conn:
+        with conn.cursor(row_factory=psycopg.rows.dict_row) as cur:
+            # Get all unique conversation IDs with message counts and last updated time
+            cur.execute("""
+                SELECT 
+                    conversation_id,
+                    COUNT(*) as message_count,
+                    MAX(created_at) as last_updated
+                FROM messages
+                GROUP BY conversation_id
+                ORDER BY last_updated DESC
+            """)
+            results = cur.fetchall()
+            
+            return [
+                ConversationListItem(
+                    conversation_id=row["conversation_id"],
+                    message_count=row["message_count"],
+                    last_updated=row["last_updated"].isoformat() if row["last_updated"] else None
+                )
+                for row in results
+            ]
+
+
+@app.get("/api/conversations/{conversation_id}/messages", response_model=List[MessageResponse])
+async def get_conversation_messages(conversation_id: str):
+    """Get all messages for a specific conversation"""
+    if conv_store is None:
+        raise HTTPException(status_code=500, detail="Database connection not configured")
+    
+    messages = conv_store.get_conversation(conversation_id)
+    
+    return [
+        MessageResponse(
+            message_type=msg["message_type"],
+            content=msg["content"],
+            sequence_number=msg["sequence_number"],
+            created_at=msg["created_at"].isoformat() if msg["created_at"] else ""
+        )
+        for msg in messages
+    ]
+
+
+@app.get("/health")
+async def health():
+    return {"status": "healthy", "db_connected": conv_store is not None}
+
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(
+        "server_viewer:app",
+        host="0.0.0.0",
+        port=8590,
+        reload=True,
+    )
+
diff --git a/static/viewer.html b/static/viewer.html
new file mode 100644
index 0000000..63672e1
--- /dev/null
+++ b/static/viewer.html
@@ -0,0 +1,394 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Conversation Viewer</title>
+    <style>
+        * {
+            margin: 0;
+            padding: 0;
+            box-sizing: border-box;
+        }
+
+        body {
+            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
+            height: 100vh;
+            display: flex;
+            background-color: #f5f5f5;
+        }
+
+        /* Left Sidebar - Conversation List */
+        .sidebar {
+            width: 300px;
+            background-color: #2c3e50;
+            color: white;
+            display: flex;
+            flex-direction: column;
+            border-right: 1px solid #34495e;
+        }
+
+        .sidebar-header {
+            padding: 20px;
+            background-color: #34495e;
+            border-bottom: 1px solid #2c3e50;
+        }
+
+        .sidebar-header h1 {
+            font-size: 20px;
+            font-weight: 600;
+        }
+
+        .conversation-list {
+            flex: 1;
+            overflow-y: auto;
+            padding: 10px;
+        }
+
+        .conversation-item {
+            padding: 12px 15px;
+            margin-bottom: 8px;
+            background-color: #34495e;
+            border-radius: 8px;
+            cursor: pointer;
+            transition: all 0.2s;
+            border: 2px solid transparent;
+        }
+
+        .conversation-item:hover {
+            background-color: #3d566e;
+            transform: translateX(2px);
+        }
+
+        .conversation-item.active {
+            background-color: #3498db;
+            border-color: #2980b9;
+        }
+
+        .conversation-id {
+            font-weight: 600;
+            font-size: 14px;
+            margin-bottom: 4px;
+            word-break: break-all;
+        }
+
+        .conversation-meta {
+            font-size: 12px;
+            opacity: 0.8;
+            display: flex;
+            justify-content: space-between;
+            align-items: center;
+        }
+
+        .message-count {
+            background-color: rgba(255, 255, 255, 0.2);
+            padding: 2px 8px;
+            border-radius: 12px;
+            font-size: 11px;
+        }
+
+        /* Main Content Area */
+        .main-content {
+            flex: 1;
+            display: flex;
+            flex-direction: column;
+            background-color: #ffffff;
+        }
+
+        .chat-header {
+            padding: 20px;
+            background-color: #ecf0f1;
+            border-bottom: 1px solid #bdc3c7;
+        }
+
+        .chat-header h2 {
+            font-size: 18px;
+            color: #2c3e50;
+        }
+
+        .chat-header .conversation-id-display {
+            font-size: 14px;
+            color: #7f8c8d;
+            margin-top: 4px;
+        }
+
+        .messages-container {
+            flex: 1;
+            overflow-y: auto;
+            padding: 20px;
+            background: linear-gradient(to bottom, #f8f9fa, #ffffff);
+        }
+
+        .message {
+            margin-bottom: 16px;
+            display: flex;
+            animation: fadeIn 0.3s ease-in;
+        }
+
+        @keyframes fadeIn {
+            from {
+                opacity: 0;
+                transform: translateY(10px);
+            }
+            to {
+                opacity: 1;
+                transform: translateY(0);
+            }
+        }
+
+        .message.human {
+            justify-content: flex-end;
+        }
+
+        .message.ai,
+        .message.tool {
+            justify-content: flex-start;
+        }
+
+        .message-bubble {
+            max-width: 70%;
+            padding: 12px 16px;
+            border-radius: 18px;
+            word-wrap: break-word;
+            position: relative;
+        }
+
+        .message.human .message-bubble {
+            background-color: #3498db;
+            color: white;
+            border-bottom-right-radius: 4px;
+        }
+
+        .message.ai .message-bubble {
+            background-color: #e8f5e9;
+            color: #2c3e50;
+            border-bottom-left-radius: 4px;
+        }
+
+        .message.tool .message-bubble {
+            background-color: #fff3e0;
+            color: #2c3e50;
+            border-bottom-left-radius: 4px;
+            border-left: 3px solid #ff9800;
+        }
+
+        .message-type-label {
+            font-size: 11px;
+            font-weight: 600;
+            text-transform: uppercase;
+            margin-bottom: 4px;
+            opacity: 0.7;
+        }
+
+        .message-content {
+            font-size: 14px;
+            line-height: 1.5;
+            white-space: pre-wrap;
+        }
+
+        .message-time {
+            font-size: 11px;
+            opacity: 0.6;
+            margin-top: 4px;
+        }
+
+        .empty-state {
+            display: flex;
+            flex-direction: column;
+            align-items: center;
+            justify-content: center;
+            height: 100%;
+            color: #95a5a6;
+        }
+
+        .empty-state-icon {
+            font-size: 48px;
+            margin-bottom: 16px;
+        }
+
+        .loading {
+            text-align: center;
+            padding: 40px;
+            color: #7f8c8d;
+        }
+
+        .error {
+            background-color: #fee;
+            color: #c33;
+            padding: 12px;
+            margin: 10px;
+            border-radius: 4px;
+            border-left: 4px solid #c33;
+        }
+
+        /* Scrollbar styling */
+        .conversation-list::-webkit-scrollbar,
+        .messages-container::-webkit-scrollbar {
+            width: 8px;
+        }
+
+        .conversation-list::-webkit-scrollbar-track,
+        .messages-container::-webkit-scrollbar-track {
+            background: #2c3e50;
+        }
+
+        .conversation-list::-webkit-scrollbar-thumb {
+            background: #34495e;
+            border-radius: 4px;
+        }
+
+        .messages-container::-webkit-scrollbar-track {
+            background: #f8f9fa;
+        }
+
+        .messages-container::-webkit-scrollbar-thumb {
+            background: #bdc3c7;
+            border-radius: 4px;
+        }
+    </style>
+</head>
+<body>
+    <!-- Left Sidebar -->
+    <div class="sidebar">
+        <div class="sidebar-header">
+            <h1>💬 Conversations</h1>
+        </div>
+        <div class="conversation-list" id="conversationList">
+            <div class="loading">Loading conversations...</div>
+        </div>
+    </div>
+
+    <!-- Main Content -->
+    <div class="main-content">
+        <div class="chat-header">
+            <h2>Conversation Messages</h2>
+            <div class="conversation-id-display" id="conversationIdDisplay">Select a conversation to view messages</div>
+        </div>
+        <div class="messages-container" id="messagesContainer">
+            <div class="empty-state">
+                <div class="empty-state-icon">👈</div>
+                <div>Select a conversation from the left to view messages</div>
+            </div>
+        </div>
+    </div>
+
+    <script>
+        const API_BASE = window.location.origin;
+        let currentConversationId = null;
+
+        // Load conversations on page load
+        async function loadConversations() {
+            const listEl = document.getElementById('conversationList');
+            try {
+                const response = await fetch(`${API_BASE}/api/conversations`);
+                if (!response.ok) throw new Error('Failed to load conversations');
+                
+                const conversations = await response.json();
+                
+                if (conversations.length === 0) {
+                    listEl.innerHTML = '<div class="loading">No conversations found</div>';
+                    return;
+                }
+
+                listEl.innerHTML = conversations.map(conv => `
+                    <div class="conversation-item" data-id="${conv.conversation_id}">
+                        <div class="conversation-id">${conv.conversation_id}</div>
+                        <div class="conversation-meta">
+                            <span>${formatDate(conv.last_updated)}</span>
+                            <span class="message-count">${conv.message_count} msgs</span>
+                        </div>
+                    </div>
+                `).join('');
+
+                // Add click handlers
+                listEl.querySelectorAll('.conversation-item').forEach(item => {
+                    item.addEventListener('click', () => {
+                        const convId = item.dataset.id;
+                        selectConversation(convId);
+                    });
+                });
+
+                // Select first conversation by default
+                if (conversations.length > 0) {
+                    selectConversation(conversations[0].conversation_id);
+                }
+            } catch (error) {
+                listEl.innerHTML = `<div class="error">Error loading conversations: ${error.message}</div>`;
+                console.error('Error loading conversations:', error);
+            }
+        }
+
+        // Select a conversation and load its messages
+        async function selectConversation(conversationId) {
+            currentConversationId = conversationId;
+            
+            // Update UI
+            document.querySelectorAll('.conversation-item').forEach(item => {
+                item.classList.toggle('active', item.dataset.id === conversationId);
+            });
+            
+            document.getElementById('conversationIdDisplay').textContent = conversationId;
+            
+            const container = document.getElementById('messagesContainer');
+            container.innerHTML = '<div class="loading">Loading messages...</div>';
+
+            try {
+                const response = await fetch(`${API_BASE}/api/conversations/${conversationId}/messages`);
+                if (!response.ok) throw new Error('Failed to load messages');
+                
+                const messages = await response.json();
+                
+                if (messages.length === 0) {
+                    container.innerHTML = '<div class="empty-state"><div>No messages in this conversation</div></div>';
+                    return;
+                }
+
+                container.innerHTML = messages.map(msg => {
+                    const isHuman = msg.message_type === 'human';
+                    const isTool = msg.message_type === 'tool';
+                    const alignClass = isHuman ? 'human' : (isTool ? 'tool' : 'ai');
+                    const typeLabel = isTool ? 'Tool' : (isHuman ? 'You' : 'AI');
+                    
+                    return `
+                        <div class="message ${alignClass}">
+                            <div class="message-bubble">
+                                <div class="message-type-label">${typeLabel}</div>
+                                <div class="message-content">${escapeHtml(msg.content)}</div>
+                                <div class="message-time">${formatDate(msg.created_at)}</div>
+                            </div>
+                        </div>
+                    `;
+                }).join('');
+
+                // Scroll to bottom
+                container.scrollTop = container.scrollHeight;
+            } catch (error) {
+                container.innerHTML = `<div class="error">Error loading messages: ${error.message}</div>`;
+                console.error('Error loading messages:', error);
+            }
+        }
+
+        // Utility functions
+        function formatDate(dateString) {
+            if (!dateString) return 'Unknown';
+            const date = new Date(dateString);
+            return date.toLocaleString('en-US', {
+                month: 'short',
+                day: 'numeric',
+                hour: '2-digit',
+                minute: '2-digit'
+            });
+        }
+
+        function escapeHtml(text) {
+            const div = document.createElement('div');
+            div.textContent = text;
+            return div.innerHTML;
+        }
+
+        // Initialize on page load
+        loadConversations();
+    </script>
+</body>
+</html>
+