diff --git a/web/static/src/ts/core/utils.ts b/web/static/src/ts/core/utils.ts
index 06ff89d8..c85d87ac 100644
--- a/web/static/src/ts/core/utils.ts
+++ b/web/static/src/ts/core/utils.ts
@@ -51,3 +51,35 @@ export function memoize<R, T extends (...args: any[]) => R>(
   }
   return memoizedFunction as T;
 }
+
+/**
+ * Returns a function, that, as long as it continues to be invoked, will not
+ * be triggered. The function will be called after it stops being called for
+ * N milliseconds. If `immediate` is passed, trigger the function on the
+ * leading edge, instead of the trailing.
+ *
+ * Inspired by https://davidwalsh.name/javascript-debounce-function
+ */
+export function debounce(
+  func: Function,
+  wait: number,
+  immediate?: boolean
+): Function {
+  let timeout;
+  return function(this: any) {
+    const context = this;
+    const args = arguments;
+    function later() {
+      timeout = null;
+      if (!immediate) {
+        func.apply(context, args);
+      }
+    }
+    const callNow = immediate && !timeout;
+    clearTimeout(timeout);
+    timeout = setTimeout(later, wait);
+    if (callNow) {
+      func.apply(context, args);
+    }
+  };
+}
diff --git a/web/static/src/ts/env.ts b/web/static/src/ts/env.ts
index f62c0797..5deaced1 100644
--- a/web/static/src/ts/env.ts
+++ b/web/static/src/ts/env.ts
@@ -74,6 +74,6 @@ export const makeEnvironment = memoize(function(): Env {
 
     rpc: ajax.rpc,
     debug: false,
-    isMobile: false
+    isMobile: window.innerWidth <= 768
   };
 });
diff --git a/web/static/src/ts/main.ts b/web/static/src/ts/main.ts
index 57c28ac9..11fd908c 100644
--- a/web/static/src/ts/main.ts
+++ b/web/static/src/ts/main.ts
@@ -4,6 +4,7 @@ import { makeEnvironment } from "./env";
 import { registry } from "./registry";
 import { Discuss } from "./widgets/discuss";
 import { Root } from "./root";
+import { debounce } from "./core/utils";
 
 //------------------------------------------------------------------------------
 // Prepare application registry
@@ -17,4 +18,12 @@ document.addEventListener("DOMContentLoaded", async function() {
   const env = makeEnvironment();
   const rootWidget = new Root(env);
   await rootWidget.mount(document.body);
+
+  window.addEventListener("resize", <any>debounce(() => {
+    const isMobile = window.innerWidth <= 768;
+    if (isMobile !== env.isMobile) {
+      env.isMobile = isMobile;
+      rootWidget.render();
+    }
+  }, 100));
 });
diff --git a/web/static/src/ts/widgets/Navbar.ts b/web/static/src/ts/widgets/Navbar.ts
index ba408d00..1b1ce40b 100644
--- a/web/static/src/ts/widgets/Navbar.ts
+++ b/web/static/src/ts/widgets/Navbar.ts
@@ -3,7 +3,7 @@ import { Env, Menu } from "../env";
 
 const template = `
     <div class="o_navbar">
-        <span class="title">Odoo</span>
+        <span class="title">Odoo<t t-if="env.isMobile"> MOBILE</t></span>
         <ul>
             <li t-foreach="env.menus" t-as="menu">
                 <a t-att-href="getUrl(menu)">
diff --git a/web/static/tests/core/utils.test.ts b/web/static/tests/core/utils.test.ts
index 443b4fa3..f604a4e9 100644
--- a/web/static/tests/core/utils.test.ts
+++ b/web/static/tests/core/utils.test.ts
@@ -2,7 +2,8 @@ import {
   escape,
   htmlTrim,
   idGenerator,
-  memoize
+  memoize,
+  debounce
 } from "../../src/ts/core/utils";
 
 describe("escape", () => {
@@ -59,3 +60,20 @@ describe("memoize", () => {
     expect(nCalls).toBe(1);
   });
 });
+
+describe("debounce", () => {
+  test("works as expected", () => {
+    jest.useFakeTimers();
+    let n = 0;
+    let f = debounce(() => n++, 100);
+    expect(n).toBe(0);
+    f();
+    expect(n).toBe(0);
+    f();
+    expect(n).toBe(0);
+    jest.advanceTimersByTime(90);
+    expect(n).toBe(0);
+    jest.advanceTimersByTime(20);
+    expect(n).toBe(1);
+  });
+});
diff --git a/web/static/tests/widgets/__snapshots__/navbar.test.ts.snap b/web/static/tests/widgets/__snapshots__/navbar.test.ts.snap
index cb4f8e27..daca628c 100644
--- a/web/static/tests/widgets/__snapshots__/navbar.test.ts.snap
+++ b/web/static/tests/widgets/__snapshots__/navbar.test.ts.snap
@@ -21,3 +21,12 @@ exports[`can render one menu item 1`] = `
         </ul>
     </div>"
 `;
+
+exports[`mobile mode: navbar is different 1`] = `
+"<div class=\\"o_navbar\\">
+        <span class=\\"title\\">Odoo MOBILE</span>
+        <ul>
+            
+        </ul>
+    </div>"
+`;
diff --git a/web/static/tests/widgets/navbar.test.ts b/web/static/tests/widgets/navbar.test.ts
index 5a8a5e3d..0531244a 100644
--- a/web/static/tests/widgets/navbar.test.ts
+++ b/web/static/tests/widgets/navbar.test.ts
@@ -34,3 +34,10 @@ test("can render one menu item", async () => {
   await navbar.mount(fixture);
   expect(fixture.innerHTML).toMatchSnapshot();
 });
+
+test("mobile mode: navbar is different", async () => {
+  env.isMobile = true;
+  const navbar = new Navbar(env);
+  await navbar.mount(fixture);
+  expect(fixture.innerHTML).toMatchSnapshot();
+});