diff --git a/.storybook/decorators/withStellarWallet.tsx b/.storybook/decorators/withStellarWallet.tsx
index 15109a2..48f1528 100644
--- a/.storybook/decorators/withStellarWallet.tsx
+++ b/.storybook/decorators/withStellarWallet.tsx
@@ -6,6 +6,7 @@ interface StellarWalletOverrides {
   isConnected?: boolean;
   isInstalled?: boolean | null;
   isNetworkMismatch?: boolean;
+  freighterNetwork?: string | null;
   connect?: () => Promise<void>;
   disconnect?: () => void;
   signMessage?: (message: string) => Promise<Uint8Array>;
@@ -25,6 +26,7 @@ export function withStellarWallet(overrides: StellarWalletOverrides = {}): Decor
     isConnected: overrides.isConnected ?? address !== null,
     isInstalled: overrides.isInstalled !== undefined ? overrides.isInstalled : true,
     isNetworkMismatch: overrides.isNetworkMismatch ?? false,
+    freighterNetwork: overrides.freighterNetwork ?? null,
     connect: overrides.connect ?? (async () => {}),
     disconnect: overrides.disconnect ?? (() => {}),
     signMessage: overrides.signMessage ?? (async () => new Uint8Array(64)),
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
index 7c4e8a5..551b16e 100644
--- a/src/components/Header.tsx
+++ b/src/components/Header.tsx
@@ -4,6 +4,7 @@ import { useTranslation } from 'react-i18next';
 import { ChainSwitcher } from './ChainSwitcher';
 import { WalletConnect } from './WalletConnect';
 import { LocaleSwitcher } from './LocaleSwitcher';
+import { NetworkChip } from './NetworkChip';
 import { useTheme } from '@/context/ThemeContext';
 
 export function Header() {
@@ -83,6 +84,7 @@ export function Header() {
           </button>
           <div className="hidden sm:flex sm:items-center sm:gap-3">
             <ChainSwitcher />
+            <NetworkChip />
             <WalletConnect />
           </div>
           <button
diff --git a/src/components/NetworkChip.tsx b/src/components/NetworkChip.tsx
new file mode 100644
index 0000000..018ddc5
--- /dev/null
+++ b/src/components/NetworkChip.tsx
@@ -0,0 +1,32 @@
+import { useStellarWallet } from '@/context/StellarWalletContext';
+
+const NETWORK_LABELS: Record<string, string> = {
+  PUBLIC: 'Mainnet',
+  TESTNET: 'Testnet',
+  FUTURENET: 'Futurenet',
+};
+
+export function NetworkChip() {
+  const { isInstalled, isConnected, freighterNetwork, isNetworkMismatch } = useStellarWallet();
+
+  // Nothing to show until Freighter is installed and connected
+  if (!isInstalled || !isConnected) return null;
+
+  const label = freighterNetwork ? (NETWORK_LABELS[freighterNetwork] ?? freighterNetwork) : '—';
+
+  return (
+    <span
+      title={isNetworkMismatch ? 'Wallet network does not match app network' : undefined}
+      className={`inline-flex items-center gap-1.5 border px-2 py-0.5 font-mono text-[9px] uppercase tracking-wider ${
+        isNetworkMismatch ? 'border-error text-error' : 'border-outline-variant text-outline'
+      }`}
+    >
+      <span
+        className={`inline-block h-1.5 w-1.5 rounded-full ${
+          isNetworkMismatch ? 'bg-error' : 'bg-tertiary'
+        }`}
+      />
+      {label}
+    </span>
+  );
+}
diff --git a/src/components/NetworkMismatchModal.tsx b/src/components/NetworkMismatchModal.tsx
new file mode 100644
index 0000000..90dccea
--- /dev/null
+++ b/src/components/NetworkMismatchModal.tsx
@@ -0,0 +1,44 @@
+import { useStellarWallet } from '@/context/StellarWalletContext';
+import { STELLAR_NETWORK } from '@/config';
+
+interface NetworkMismatchModalProps {
+  onClose: () => void;
+}
+
+const NETWORK_LABELS: Record<string, string> = {
+  PUBLIC: 'Mainnet',
+  TESTNET: 'Testnet',
+  FUTURENET: 'Futurenet',
+};
+
+export function NetworkMismatchModal({ onClose }: NetworkMismatchModalProps) {
+  const { freighterNetwork } = useStellarWallet();
+
+  const walletLabel = freighterNetwork
+    ? (NETWORK_LABELS[freighterNetwork] ?? freighterNetwork)
+    : 'an unknown network';
+
+  return (
+    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/70">
+      <div className="mx-4 w-full max-w-lg border border-outline-variant bg-surface-container p-6">
+        <h2 className="mb-1 font-heading text-lg font-bold uppercase tracking-tight text-on-surface">
+          Network Mismatch
+        </h2>
+        <p className="mb-6 font-body text-xs text-on-surface-variant">
+          Your wallet is connected to <span className="text-primary">{walletLabel}</span>, but this
+          app runs on <span className="text-primary">{STELLAR_NETWORK.name}</span>. Open Freighter
+          and switch its network to continue.
+        </p>
+
+        <div className="flex gap-2">
+          <button
+            onClick={onClose}
+            className="flex-1 border border-outline-variant py-2 font-heading text-[10px] uppercase tracking-widest text-primary transition-colors hover:bg-surface-bright"
+          >
+            OK, Got It
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+}
diff --git a/src/components/StellarReceive.tsx b/src/components/StellarReceive.tsx
index a7857ec..5ac342e 100644
--- a/src/components/StellarReceive.tsx
+++ b/src/components/StellarReceive.tsx
@@ -38,6 +38,7 @@ import type { ImportResult } from '@/lib/stealthLabels';
 import { KeyVault } from '@/vault';
 import { STELLAR_ASSETS, getAssetByKey, parseAssetBalances } from '@/lib/stellar/assets';
 import { useStellarNotifications } from '@/hooks/useStellarNotifications';
+import { NetworkMismatchModal } from '@/components/NetworkMismatchModal';
 import { useStealthLabels } from '@/hooks/useStealthLabels';
 import { StellarBatchWithdrawModal } from '@/components/StellarBatchWithdrawModal';
 import { createStellarQrUri } from '@/utils/qr';
@@ -178,7 +179,7 @@ function StellarMatchCardContainer({
   onToggleSelect?: () => void;
 }) {
   const { t } = useTranslation();
-  const { address, signTransaction } = useStellarWallet();
+  const { address, signTransaction, isNetworkMismatch } = useStellarWallet();
   const [balances, setBalances] = useState<Record<string, string>>({});
   const [balanceState, setBalanceState] = useState<'loading' | 'loaded' | 'error'>('loading');
   const [withdrawAssetKey, setWithdrawAssetKey] = useState<StellarAssetKey>('XLM');
@@ -192,6 +193,7 @@ function StellarMatchCardContainer({
   const [retryStatus, setRetryStatus] = useState('');
   const [showKey, setShowKey] = useState(false);
   const [showSponsorPrompt, setShowSponsorPrompt] = useState(false);
+  const [showNetworkModal, setShowNetworkModal] = useState(false);
 
   const { upsert } = useActivity();
   const scalarHex = match.stealthPrivateScalar.toString(16).padStart(64, '0');
@@ -233,6 +235,12 @@ function StellarMatchCardContainer({
 
   const handleWithdraw = async () => {
     if (!dest) return;
+
+    if (isNetworkMismatch) {
+      setShowNetworkModal(true);
+      return;
+    }
+
     setError('');
     setRetryStatus('');
     setWithdrawing(true);
@@ -401,6 +409,12 @@ function StellarMatchCardContainer({
 
   const handleSponsoredWithdraw = async () => {
     if (!dest || !address) return;
+
+    if (isNetworkMismatch) {
+      setShowNetworkModal(true);
+      return;
+    }
+
     setError('');
     setRetryStatus('');
     setWithdrawing(true);
@@ -648,13 +662,15 @@ function StellarMatchCardContainer({
         showPrivacyWarning={showPrivacyWarning}
         onDismissPrivacyWarning={onDismissPrivacyWarning}
       />
+      {showNetworkModal && <NetworkMismatchModal onClose={() => setShowNetworkModal(false)} />}
     </>
   );
 }
 
 export function StellarReceive() {
   const { t } = useTranslation();
-  const { address, isConnected, signMessage, signTransaction } = useStellarWallet();
+  const { address, isConnected, signMessage, signTransaction, isNetworkMismatch } =
+    useStellarWallet();
   const { stellarKeys, stellarMetaAddress, setStellarKeys, setStellarMetaAddress } =
     useStealthKeys();
   const addActivity = useActivityStore((state) => state.addEntry);
@@ -676,6 +692,7 @@ export function StellarReceive() {
   }, []);
   const [hasScanned, setHasScanned] = useState(false);
   const [error, setError] = useState('');
+  const [showNetworkModal, setShowNetworkModal] = useState(false);
   const [retryStatus, setRetryStatus] = useState('');
   const [isRegistering, setIsRegistering] = useState(false);
   const [isRegSuccess, setIsRegSuccess] = useState(false);
@@ -1049,6 +1066,12 @@ export function StellarReceive() {
 
   const registerOnChain = useCallback(async () => {
     if (!stellarKeys || !address) return;
+
+    if (isNetworkMismatch) {
+      setShowNetworkModal(true);
+      return;
+    }
+
     setIsRegistering(true);
     setError('');
     setRetryStatus('');
@@ -1450,6 +1473,7 @@ export function StellarReceive() {
           onClose={() => setShowQRModal(false)}
         />
       )}
+      {showNetworkModal && <NetworkMismatchModal onClose={() => setShowNetworkModal(false)} />}
       <StellarBatchWithdrawModal
         isOpen={isBatchModalOpen}
         onClose={() => setIsBatchModalOpen(false)}
diff --git a/src/components/StellarSend.tsx b/src/components/StellarSend.tsx
index 8f8514a..ec85144 100644
--- a/src/components/StellarSend.tsx
+++ b/src/components/StellarSend.tsx
@@ -1,4 +1,5 @@
 // @ts-nocheck  (temporary: wave-6 merges left stale symbol names; unblocks CI)
+import { NetworkMismatchModal } from '@/components/NetworkMismatchModal';
 import { useState, useCallback, useEffect, useMemo, useRef } from 'react';
 import { useSearchParams } from 'react-router-dom';
 import { QrReader } from 'react-qr-reader';
@@ -103,7 +104,7 @@ export function StellarSend() {
   const paramMemo = searchParams.get('memo');
   const paramExp = searchParams.get('exp');
 
-  const { address, isConnected, signTransaction } = useStellarWallet();
+  const { address, isConnected, signTransaction, isNetworkMismatch } = useStellarWallet();
   const addActivity = useActivityStore((state) => state.addEntry);
   const updateActivity = useActivityStore((state) => state.updateStatus);
   const [recipient, setRecipient] = useState(paramTo || '');
@@ -114,6 +115,7 @@ export function StellarSend() {
   const { isKnownAddress, addContact } = useContacts();
   const { isKnownRecipient, addToHistory } = useNameHistory();
   const [error, setError] = useState('');
+  const [showNetworkModal, setShowNetworkModal] = useState(false);
   const [, setTouched] = useState({ recipient: false, amount: false });
   const [, setSubmitAttempted] = useState(false);
 
@@ -491,6 +493,11 @@ export function StellarSend() {
       return;
     }
 
+    if (isNetworkMismatch) {
+      setShowNetworkModal(true);
+      return;
+    }
+
     if (!canSubmit) {
       setError(validationError || 'Enter valid send details');
       return;
@@ -943,6 +950,7 @@ export function StellarSend() {
           )}
         </div>
       )}
+      {showNetworkModal && <NetworkMismatchModal onClose={() => setShowNetworkModal(false)} />}
 
       {isScanningQR && (
         <div
diff --git a/src/components/StellarVaultClaim.tsx b/src/components/StellarVaultClaim.tsx
index c9a2d3b..74d02b5 100644
--- a/src/components/StellarVaultClaim.tsx
+++ b/src/components/StellarVaultClaim.tsx
@@ -1,5 +1,6 @@
 import { useState, useCallback } from 'react';
 import { CopyButton } from '@/components/CopyButton';
+import { NetworkMismatchModal } from '@/components/NetworkMismatchModal';
 import { useStellarWallet } from '@/context/StellarWalletContext';
 import { StellarLink } from '@/components/StellarLink';
 
@@ -35,12 +36,13 @@ type VaultDeposit = {
 };
 
 export function StellarVaultClaim() {
-  const { address, signMessage } = useStellarWallet();
+  const { address, signMessage, isNetworkMismatch } = useStellarWallet();
   const [deposits, setDeposits] = useState<VaultDeposit[]>(MOCK_DEPOSITS);
   const [claimingId, setClaimingId] = useState<string | null>(null);
   const [claimState, setClaimState] = useState<ClaimState>('idle');
   const [error, setError] = useState('');
   const [txHash, setTxHash] = useState<string | null>(null);
+  const [showNetworkModal, setShowNetworkModal] = useState(false);
 
   const handleClaim = useCallback(
     async (depositId: string) => {
@@ -49,6 +51,11 @@ export function StellarVaultClaim() {
         return;
       }
 
+      if (isNetworkMismatch) {
+        setShowNetworkModal(true);
+        return;
+      }
+
       setClaimingId(depositId);
       setClaimState('signing');
       setError('');
@@ -80,7 +87,7 @@ export function StellarVaultClaim() {
         setClaimingId(null);
       }
     },
-    [address, signMessage],
+    [address, signMessage, isNetworkMismatch],
   );
 
   const reset = () => {
@@ -221,6 +228,8 @@ export function StellarVaultClaim() {
           </button>
         </div>
       ))}
+
+      {showNetworkModal && <NetworkMismatchModal onClose={() => setShowNetworkModal(false)} />}
     </div>
   );
 }
diff --git a/src/context/StellarWalletContext.tsx b/src/context/StellarWalletContext.tsx
index 2be13e8..07ecd31 100644
--- a/src/context/StellarWalletContext.tsx
+++ b/src/context/StellarWalletContext.tsx
@@ -9,6 +9,7 @@ interface StellarWalletContextValue {
   isConnected: boolean;
   isInstalled: boolean | null; // null while the initial extension check is in-flight
   isNetworkMismatch: boolean;
+  freighterNetwork: string | null;
   connect: () => Promise<void>;
   disconnect: () => void;
   signMessage: (message: string) => Promise<Uint8Array>;
@@ -30,7 +31,7 @@ export function StellarWalletProvider({ children }: { children: React.ReactNode
   const [address, setAddress] = useState<string | null>(null);
   const [isInstalled, setIsInstalled] = useState<boolean | null>(null);
   const [freighterPassphrase, setFreighterPassphrase] = useState<string | null>(null);
-
+  const [freighterNetwork, setFreighterNetwork] = useState<string | null>(null);
   const tabId = useRef(crypto.randomUUID());
   const channelRef = useRef<BroadcastChannel | null>(null);
   const passPhraseRef = useRef<string | null>(null);
@@ -120,6 +121,10 @@ export function StellarWalletProvider({ children }: { children: React.ReactNode
           passPhraseRef.current = pass;
         }
 
+        if (details.network) {
+          setFreighterNetwork(details.network);
+        }
+
         // Restore silently only if user has not explicitly disconnected this session
         const { isAllowed: allowed } = await freighter.isAllowed();
         if (allowed && !manuallyDisconnected.current) {
@@ -142,10 +147,12 @@ export function StellarWalletProvider({ children }: { children: React.ReactNode
         w.watch(
           ({
             address: newAddr,
+            network: newNetwork,
             networkPassphrase: newPass,
             error,
           }: {
             address?: string;
+            network?: string;
             networkPassphrase?: string;
             error?: unknown;
           }) => {
@@ -157,6 +164,9 @@ export function StellarWalletProvider({ children }: { children: React.ReactNode
             if (newPass && newPass !== passPhraseRef.current) {
               passPhraseRef.current = newPass;
               setFreighterPassphrase(newPass);
+              if (newNetwork) {
+                setFreighterNetwork(newNetwork);
+              }
               fireListeners();
               channelRef.current?.postMessage({
                 type: 'NETWORK_CHANGED',
@@ -318,6 +328,7 @@ export function StellarWalletProvider({ children }: { children: React.ReactNode
         isConnected,
         isInstalled,
         isNetworkMismatch,
+        freighterNetwork,
         connect,
         disconnect,
         signMessage,