diff --git a/web/cashtab/src/components/App.js b/web/cashtab/src/components/App.js
--- a/web/cashtab/src/components/App.js
+++ b/web/cashtab/src/components/App.js
@@ -1,6 +1,6 @@
-import React, { useState } from 'react';
+import React, { useState, useEffect } from 'react';
 import 'antd/dist/antd.less';
-import { Spin } from 'antd';
+import { Modal, Spin } from 'antd';
 import { CashLoadingIcon } from '@components/Common/CustomIcons';
 import '../index.css';
 import styled, { ThemeProvider, createGlobalStyle } from 'styled-components';
@@ -33,6 +33,7 @@
 import TabCash from '@assets/tabcash.png';
 import ABC from '@assets/logo_topright.png';
 import { checkForTokenById } from '@utils/tokenMethods.js';
+import { currency } from './Common/Ticker';
 
 const GlobalStyle = createGlobalStyle`    
     .ant-modal-wrap > div > div.ant-modal-content > div > div > div.ant-modal-confirm-btns > button, .ant-modal > button, .ant-modal-confirm-btns > button, .ant-modal-footer > button {
@@ -235,6 +236,41 @@
           )
         : false;
 
+    useEffect(() => {
+        // If URL is not as specified in currency.appURL in Ticker.js, show a popup
+        const currentUrl = window.location.hostname;
+        if (currentUrl !== currency.appUrl) {
+            console.log(
+                `Loaded URL ${currentUrl} does not match app URL ${currency.appUrl}!`,
+            );
+            Modal.warning({
+                title: 'Cashtab is moving!',
+                content: (
+                    <div>
+                        <p>
+                            Cashtab is moving to a new home at{' '}
+                            <a
+                                href="https://cashtab.com/"
+                                target="_blank"
+                                rel="noreferrer"
+                            >
+                                Cashtab.com
+                            </a>
+                        </p>
+                        <p>
+                            Please write down your wallet 12-word seed and
+                            import it at the new domain.
+                        </p>
+                        <p>
+                            At the end of the month, cashtabapp.com will
+                            auto-fwd to cashtab.com after one minute.
+                        </p>
+                    </div>
+                ),
+            });
+        }
+    }, []);
+
     return (
         <ThemeProvider theme={theme}>
             <GlobalStyle />
diff --git a/web/cashtab/src/components/Common/Ticker.js b/web/cashtab/src/components/Common/Ticker.js
--- a/web/cashtab/src/components/Common/Ticker.js
+++ b/web/cashtab/src/components/Common/Ticker.js
@@ -6,6 +6,7 @@
 export const currency = {
     name: 'eCash',
     ticker: 'XEC',
+    appUrl: 'cashtabapp.com',
     logo: mainLogo,
     legacyPrefix: 'bitcoincash',
     prefixes: ['ecash'],