diff --git a/app/src/components/Header.tsx b/app/src/components/Header.tsx
index 1327545..a90275a 100644
--- a/app/src/components/Header.tsx
+++ b/app/src/components/Header.tsx
@@ -22,6 +22,7 @@ import {
   X,
   Clock,
   Trash2,
+  Loader2,
 } from 'lucide-react';
 import {
   DropdownMenu,
@@ -30,6 +31,12 @@ import {
   DropdownMenuSeparator,
   DropdownMenuTrigger,
 } from '@/components/ui/dropdown-menu';
+import {
+  Tooltip,
+  TooltipContent,
+  TooltipProvider,
+  TooltipTrigger,
+} from '@/components/ui/tooltip';
 import {
   AlertDialog,
   AlertDialogAction,
@@ -50,7 +57,7 @@ import { WakuHealthDot } from '@/components/ui/waku-health-indicator';
 
 const Header = () => {
   const { currentUser, delegationInfo } = useAuth();
-  const { statusMessage } = useNetwork();
+  const { statusMessage, syncStatus, syncDetail } = useNetwork();
 
   const location = useLocation();
   const { toast } = useToast();
@@ -166,16 +173,52 @@ const Header = () => {
                 <span className="text-[10px] text-muted-foreground">
                   {statusMessage}
                 </span>
+                {syncStatus === 'syncing' && syncDetail && syncDetail.missing > 0 && (
+                  <TooltipProvider delayDuration={200}>
+                    <Tooltip>
+                      <TooltipTrigger asChild>
+                        <div className="flex items-center space-x-1 text-[10px] text-yellow-400 cursor-help">
+                          <Loader2 className="w-3 h-3 animate-spin" />
+                          <span>SYNCING ({syncDetail.missing})</span>
+                        </div>
+                      </TooltipTrigger>
+                      <TooltipContent>
+                        <p className="text-xs">
+                          <strong>Syncing messages</strong>
+                          <br />
+                          Pending: {syncDetail.missing}
+                          <br />
+                          Received: {syncDetail.received}
+                          {syncDetail.lost > 0 && (
+                            <>
+                              <br />
+                              Lost: {syncDetail.lost}
+                            </>
+                          )}
+                        </p>
+                      </TooltipContent>
+                    </Tooltip>
+                  </TooltipProvider>
+                )}
                 {content.lastSync && (
-                  <div className="flex items-center space-x-1 text-[10px] text-muted-foreground">
-                    <Clock className="w-3 h-3" />
-                    <span>
-                      {new Date(content.lastSync).toLocaleTimeString([], {
-                        hour: '2-digit',
-                        minute: '2-digit',
-                      })}
-                    </span>
-                  </div>
+                  <TooltipProvider delayDuration={200}>
+                    <Tooltip>
+                      <TooltipTrigger asChild>
+                        <div className="flex items-center space-x-1 text-[10px] text-muted-foreground cursor-help">
+                          <Clock className="w-3 h-3" />
+                          <span>
+                            {new Date(content.lastSync).toLocaleTimeString([], {
+                              hour: '2-digit',
+                              minute: '2-digit',
+                            })}
+                          </span>
+                        </div>
+                      </TooltipTrigger>
+                      <TooltipContent>
+                        <p className="text-xs">Last message sync time</p>
+                      </TooltipContent>
+                    </Tooltip>
+                  </TooltipProvider>
                 )}
               </div>
             </div>
@@ -183,9 +226,26 @@ const Header = () => {
             {/* Right: User Actions */}
             <div className="flex items-center space-x-2 sm:space-x-3 flex-shrink-0">
               {/* Network Status (Mobile) */}
-              <div className="lg:hidden">
-                <WakuHealthDot />
-              </div>
+              <TooltipProvider delayDuration={200}>
+                <Tooltip>
+                  <TooltipTrigger asChild>
+                    <div className="lg:hidden flex items-center space-x-1 cursor-help">
+                      {syncStatus === 'syncing' && syncDetail && syncDetail.missing > 0 ? (
+                        <Loader2 className="w-4 h-4 text-yellow-400 animate-spin" />
+                      ) : (
+                        <WakuHealthDot />
+                      )}
+                    </div>
+                  </TooltipTrigger>
+                  <TooltipContent>
+                    <p className="text-xs">
+                      {syncStatus === 'syncing' && syncDetail && syncDetail.missing > 0
+                        ? `Syncing ${syncDetail.missing} messages...`
+                        : 'Network connected'}
+                    </p>
+                  </TooltipContent>
+                </Tooltip>
+              </TooltipProvider>
 
               {/* User Status & Actions */}
               {isConnected || currentUser?.verificationStatus === EVerificationStatus.ANONYMOUS ? (
@@ -466,8 +526,14 @@ const Header = () => {
                 <div className="flex items-center space-x-2 text-[10px] uppercase tracking-[0.2em] text-muted-foreground">
                   <WakuHealthDot />
                   <span>{statusMessage}</span>
+                  {syncStatus === 'syncing' && syncDetail && syncDetail.missing > 0 && (
+                    <span className="text-yellow-400 flex items-center space-x-1">
+                      <Loader2 className="w-3 h-3 animate-spin" />
+                      <span>SYNCING ({syncDetail.missing})</span>
+                    </span>
+                  )}
                   {content.lastSync && (
-                    <span className="ml-auto">
+                    <span className="ml-auto" title="Last message sync">
                       {new Date(content.lastSync).toLocaleTimeString([], {
                         hour: '2-digit',
                         minute: '2-digit',
diff --git a/packages/core/src/lib/waku/core/ReliableMessaging.ts b/packages/core/src/lib/waku/core/ReliableMessaging.ts
index 24ad698..abf0eb0 100644
--- a/packages/core/src/lib/waku/core/ReliableMessaging.ts
+++ b/packages/core/src/lib/waku/core/ReliableMessaging.ts
@@ -16,16 +16,19 @@ export interface MessageStatusCallback {
 }
 
 export type IncomingMessageCallback = (message: OpchanMessage) => void;
+export type SyncStatusCallback = (status: 'syncing' | 'synced', detail: { received: number; missing: number; lost: number }) => void;
 
 export class ReliableMessaging {
   private channel: ReliableChannel<IDecodedMessage> | null = null;
   private messageCallbacks: Map<string, MessageStatusCallback> = new Map();
   private incomingMessageCallbacks: Set<IncomingMessageCallback> = new Set();
+  private syncStatusCallbacks: Set<SyncStatusCallback> = new Set();
   private codecManager: CodecManager;
 
   constructor(node: LightNode, config: WakuConfig) {
     this.codecManager = new CodecManager(node, config);
     this.initializeChannel(node, config);
+    
   }
 
   // ===== PUBLIC METHODS =====
@@ -58,9 +61,15 @@ export class ReliableMessaging {
     return () => this.incomingMessageCallbacks.delete(callback);
   }
 
+  public onSyncStatus(callback: SyncStatusCallback): () => void {
+    this.syncStatusCallbacks.add(callback);
+    return () => this.syncStatusCallbacks.delete(callback);
+  }
+
   public cleanup(): void {
     this.messageCallbacks.clear();
     this.incomingMessageCallbacks.clear();
+    this.syncStatusCallbacks.clear();
     this.channel = null;
   }
 
@@ -81,11 +90,30 @@ export class ReliableMessaging {
         decoder
       );
       this.setupChannelListeners(this.channel);
+      this.setupSyncStatusListeners(this.channel);
     } catch (error) {
       console.error('Failed to create reliable channel:', error);
     }
   }
 
+  private setupSyncStatusListeners(channel: ReliableChannel<IDecodedMessage>): void {
+    // Check if syncStatus API is available
+    if (!channel.syncStatus) {
+      console.warn('ReliableChannel.syncStatus is not available in this SDK version');
+      return;
+    }
+
+    channel.syncStatus.addEventListener('syncing', (event) => {
+      const detail = event.detail;
+      this.syncStatusCallbacks.forEach(cb => cb('syncing', detail));
+    });
+
+    channel.syncStatus.addEventListener('synced', (event) => {
+      const detail = event.detail;
+      this.syncStatusCallbacks.forEach(cb => cb('synced', detail));
+    });
+  }
+
   private setupChannelListeners(
     channel: ReliableChannel<IDecodedMessage>
   ): void {
diff --git a/packages/core/src/lib/waku/index.ts b/packages/core/src/lib/waku/index.ts
index 244e5f9..14148b5 100644
--- a/packages/core/src/lib/waku/index.ts
+++ b/packages/core/src/lib/waku/index.ts
@@ -5,10 +5,10 @@ import {
   MessageService,
   MessageStatusCallback,
 } from './services/MessageService';
-import { ReliableMessaging } from './core/ReliableMessaging';
+import { ReliableMessaging, SyncStatusCallback } from './core/ReliableMessaging';
 import { WakuConfig } from '../../types';
 
-export type { HealthChangeCallback, MessageStatusCallback };
+export type { HealthChangeCallback, MessageStatusCallback, SyncStatusCallback };
 
 class MessageManager {
   private nodeManager: WakuNodeManager | null = null;
@@ -71,6 +71,13 @@ class MessageManager {
     return this.messageService.onMessageReceived(callback);
   }
 
+  public onSyncStatus(callback: SyncStatusCallback): () => void {
+    if (!this.reliableMessaging) {
+      throw new Error('Reliable messaging not initialized');
+    }
+    return this.reliableMessaging.onSyncStatus(callback);
+  }
+
   // ===== PRIVATE METHODS =====
 
   private async initialize(): Promise<void> {
@@ -84,9 +91,9 @@ class MessageManager {
       );
 
       // Set up health-based reliable messaging initialization
-      this.nodeManager.onHealthChange(isReady => {
+      this.nodeManager.onHealthChange(async (isReady) => {
         if (isReady && !this.reliableMessaging) {
-          this.initializeReliableMessaging();
+          await this.initializeReliableMessaging();
         } else if (!isReady && this.reliableMessaging) {
           this.cleanupReliableMessaging();
         }
@@ -115,6 +122,10 @@ class MessageManager {
     }
   }
 
+  public getReliableMessaging(): ReliableMessaging | null {
+    return this.reliableMessaging;
+  }
+
   private cleanupReliableMessaging(): void {
     if (this.reliableMessaging) {
       console.log('Cleaning up reliable messaging due to health status');
@@ -131,6 +142,7 @@ export class DefaultMessageManager {
   private _initPromise: Promise<MessageManager> | null = null;
   private _pendingHealthSubscriptions: HealthChangeCallback[] = [];
   private _pendingMessageSubscriptions: ((message: any) => void)[] = [];
+  private _pendingSyncStatusSubscriptions: SyncStatusCallback[] = [];
   private _wakuConfig: WakuConfig | null = null;
 
   // ===== PUBLIC METHODS =====
@@ -157,6 +169,31 @@ export class DefaultMessageManager {
       this._instance!.onMessageReceived(callback);
     });
     this._pendingMessageSubscriptions = [];
+    
+    // Establish all pending sync status subscriptions
+    this._pendingSyncStatusSubscriptions.forEach(callback => {
+      try {
+        this._instance!.onSyncStatus(callback);
+      } catch (e) {
+        // Reliable messaging might not be ready yet, keep in pending
+      }
+    });
+    
+    // Set up a listener to retry sync subscriptions when reliable messaging becomes available
+    const reliableMessaging = this._instance.getReliableMessaging();
+    if (!reliableMessaging) {
+      // Watch for when it becomes available
+      const checkInterval = setInterval(() => {
+        const rm = this._instance?.getReliableMessaging();
+        if (rm && this._pendingSyncStatusSubscriptions.length > 0) {
+          this.retryPendingSyncSubscriptions();
+          clearInterval(checkInterval);
+        }
+      }, 1000);
+      
+      // Clean up after 30 seconds
+      setTimeout(() => clearInterval(checkInterval), 30000);
+    }
   }
 
   // Proxy other common methods
@@ -209,6 +246,49 @@ export class DefaultMessageManager {
     }
     return this._instance.onMessageReceived(callback);
   }
+
+  onSyncStatus(callback: SyncStatusCallback) {
+    if (!this._instance) {
+      // Queue the callback for when we're initialized
+      this._pendingSyncStatusSubscriptions.push(callback);
+      
+      return () => {
+        const index = this._pendingSyncStatusSubscriptions.indexOf(callback);
+        if (index !== -1) {
+          this._pendingSyncStatusSubscriptions.splice(index, 1);
+        }
+      };
+    }
+    try {
+      return this._instance.onSyncStatus(callback);
+    } catch (e) {
+      // Reliable messaging not ready, queue it
+      this._pendingSyncStatusSubscriptions.push(callback);
+      return () => {
+        const index = this._pendingSyncStatusSubscriptions.indexOf(callback);
+        if (index !== -1) {
+          this._pendingSyncStatusSubscriptions.splice(index, 1);
+        }
+      };
+    }
+  }
+
+  // Helper to retry pending sync subscriptions when reliable messaging becomes available
+  private retryPendingSyncSubscriptions() {
+    if (!this._instance) return;
+    
+    const pending = [...this._pendingSyncStatusSubscriptions];
+    this._pendingSyncStatusSubscriptions = [];
+    
+    pending.forEach(callback => {
+      try {
+        this._instance!.onSyncStatus(callback);
+      } catch (e) {
+        // Still not ready, put it back
+        this._pendingSyncStatusSubscriptions.push(callback);
+      }
+    });
+  }
 }
 
 const messageManager = new DefaultMessageManager();
diff --git a/packages/react/src/v1/hooks/useNetwork.ts b/packages/react/src/v1/hooks/useNetwork.ts
index ee5f352..6229ad6 100644
--- a/packages/react/src/v1/hooks/useNetwork.ts
+++ b/packages/react/src/v1/hooks/useNetwork.ts
@@ -20,6 +20,8 @@ export function useNetwork() {
     statusMessage: network.statusMessage,
     issues: network.issues,
     isHydrated: network.isHydrated,
+    syncStatus: network.syncStatus,
+    syncDetail: network.syncDetail,
     canRefresh: true,
     refresh,
   } as const;
diff --git a/packages/react/src/v1/provider/StoreWiring.tsx b/packages/react/src/v1/provider/StoreWiring.tsx
index 8ad0f10..31422e9 100644
--- a/packages/react/src/v1/provider/StoreWiring.tsx
+++ b/packages/react/src/v1/provider/StoreWiring.tsx
@@ -103,6 +103,22 @@ export const StoreWiring: React.FC = () => {
         }));
       });
 
+      // Wire sync status
+      try {
+        client.messageManager.onSyncStatus((status, detail) => {
+          setOpchanState(prev => ({
+            ...prev,
+            network: {
+              ...prev.network,
+              syncStatus: status,
+              syncDetail: detail,
+            },
+          }));
+        });
+      } catch (e) {
+        // Reliable messaging not ready yet
+      }
+
       unsubMessages = client.messageManager.onMessageReceived(async (message: OpchanMessage) => {
         // Persist, then reflect cache in store
         try {
diff --git a/packages/react/src/v1/store/opchanStore.ts b/packages/react/src/v1/store/opchanStore.ts
index ee69208..4d43de8 100644
--- a/packages/react/src/v1/store/opchanStore.ts
+++ b/packages/react/src/v1/store/opchanStore.ts
@@ -47,6 +47,8 @@ export interface NetworkSlice {
   statusMessage: string;
   issues: string[];
   isHydrated: boolean;
+  syncStatus: 'syncing' | 'synced' | 'unknown';
+  syncDetail: { received: number; missing: number; lost: number } | null;
 }
 
 export interface OpchanState {
@@ -87,6 +89,8 @@ const defaultState: OpchanState = {
     statusMessage: 'connecting…',
     issues: [],
     isHydrated: false,
+    syncStatus: 'unknown',
+    syncDetail: null,
   },
 };