diff --git a/src/app/organisms/settings/Settings.jsx b/src/app/organisms/settings/Settings.jsx
index b50c9926..c9b720d1 100644
--- a/src/app/organisms/settings/Settings.jsx
+++ b/src/app/organisms/settings/Settings.jsx
@@ -5,12 +5,14 @@ import initMatrix from '../../../client/initMatrix';
 import cons from '../../../client/state/cons';
 import settings from '../../../client/state/settings';
 import navigation from '../../../client/state/navigation';
+import { openReusableDialog } from '../../../client/action/navigation'
 import {
   toggleSystemTheme, toggleMarkdown, toggleMembershipEvents, toggleNickAvatarEvents,
   toggleNotifications, toggleNotificationSounds,
 } from '../../../client/action/settings';
 import logout from '../../../client/action/logout';
 import { usePermission } from '../../hooks/usePermission';
+import colorMXID from '../../../util/colorMXID';
 
 import Text from '../../atoms/text/Text';
 import IconButton from '../../atoms/button/IconButton';
@@ -25,6 +27,7 @@ import SettingTile from '../../molecules/setting-tile/SettingTile';
 import ImportE2ERoomKeys from '../../molecules/import-export-e2e-room-keys/ImportE2ERoomKeys';
 import ExportE2ERoomKeys from '../../molecules/import-export-e2e-room-keys/ExportE2ERoomKeys';
 import { ImagePackUser, ImagePackGlobal } from '../../molecules/image-pack/ImagePack';
+import PeopleSelector from '../../molecules/people-selector/PeopleSelector';
 
 import ProfileEditor from '../profile-editor/ProfileEditor';
 import CrossSigning from './CrossSigning';
@@ -38,6 +41,7 @@ import BellIC from '../../../../public/res/ic/outlined/bell.svg';
 import InfoIC from '../../../../public/res/ic/outlined/info.svg';
 import PowerIC from '../../../../public/res/ic/outlined/power.svg';
 import CrossIC from '../../../../public/res/ic/outlined/cross.svg';
+import AddUserIC from '../../../../public/res/ic/outlined/add-user.svg';
 
 import CinnySVG from '../../../../public/res/svg/cinny.svg';
 import { confirmDialog } from '../../molecules/confirm-dialog/ConfirmDialog';
@@ -322,6 +326,50 @@ function Settings() {
       logout();
     }
   };
+  const handleSwitchUsers = async () => {
+    const loggedInUsers = JSON.parse(window.localStorage.getItem("loggedInUsers"));
+
+    const renderUserSwitcher = () => (
+      <div>
+        {
+          loggedInUsers.map((userId) => {
+            let mx = initMatrix.matrixClient;
+            let user = mx.getUser(userId);
+            let avatarUrl = user.avatarUrl ? mx.mxcUrlToHttp(user.avatarUrl, 80, 80, 'crop') : null;
+            return (
+              <PeopleSelector
+                key={userId}
+                onClick={() => {
+                  if (userId != window.localStorage.getItem("currentUser")) {
+                    window.localStorage.setItem("currentUser", userId);
+                    window.location.reload();
+                  }
+                }}
+                name={user.displayName}
+                avatarSrc={avatarUrl}
+                color={colorMXID(userId)}
+              />
+            );
+          })
+        }
+        <Button
+          variant="caution"
+          iconSrc={AddUserIC}
+          onClick={() => {
+            window.localStorage.removeItem("currentUser");
+            window.location.reload();
+          }}
+        >
+          Add user
+        </Button>
+      </div>
+    );
+
+    await openReusableDialog(
+      <Text variant="s1" weight="medium">Switch users</Text>,
+      renderUserSwitcher,
+    )
+  }
 
   return (
     <PopupWindow
@@ -330,6 +378,9 @@ function Settings() {
       title={<Text variant="s1" weight="medium" primary>Settings</Text>}
       contentOptions={(
         <>
+          <Button variant="caution" onClick={handleSwitchUsers}>
+            Switch users
+          </Button>
           <Button variant="danger" iconSrc={PowerIC} onClick={handleLogout}>
             Logout
           </Button>
diff --git a/src/app/templates/auth/Auth.jsx b/src/app/templates/auth/Auth.jsx
index 7c211736..d8553133 100644
--- a/src/app/templates/auth/Auth.jsx
+++ b/src/app/templates/auth/Auth.jsx
@@ -9,6 +9,7 @@ import * as auth from '../../../client/action/auth';
 import cons from '../../../client/state/cons';
 import { Debounce, getUrlPrams } from '../../../util/common';
 import { getBaseUrl } from '../../../util/matrixUtil';
+import colorMXID from '../../../util/colorMXID';
 
 import Text from '../../atoms/text/Text';
 import Button from '../../atoms/button/Button';
@@ -25,6 +26,7 @@ import EyeIC from '../../../../public/res/ic/outlined/eye.svg';
 import EyeBlindIC from '../../../../public/res/ic/outlined/eye-blind.svg';
 import CinnySvg from '../../../../public/res/svg/cinny.svg';
 import SSOButtons from '../../molecules/sso-buttons/SSOButtons';
+import PeopleSelector from '../../molecules/people-selector/PeopleSelector';
 
 const LOCALPART_SIGNUP_REGEX = /^[a-z0-9_\-.=/]+$/;
 const BAD_LOCALPART_ERROR = 'Username can only contain characters a-z, 0-9, or \'=_-./\'';
@@ -539,11 +541,11 @@ function Auth() {
 
   useEffect(async () => {
     if (!loginToken) return;
-    if (localStorage.getItem(cons.secretKey.BASE_URL) === undefined) {
+    if (window.userLocalStorage.getItem(cons.secretKey.BASE_URL) === undefined) {
       setLoginToken(null);
       return;
     }
-    const baseUrl = localStorage.getItem(cons.secretKey.BASE_URL);
+    const baseUrl = window.userLocalStorage.getItem(cons.secretKey.BASE_URL);
     try {
       await auth.loginWithToken(baseUrl, loginToken);
 
@@ -567,6 +569,24 @@ function Auth() {
                   <Text variant="h2" weight="medium">Cinny</Text>
                 </TitleWrapper>
               </Header>
+              {(() => {
+                const loggedInUsers = JSON.parse(window.localStorage.getItem("loggedInUsers"));
+                return (
+                  loggedInUsers.map((userId) => {
+                    return (
+                      <PeopleSelector
+                        key={userId}
+                        onClick={() => {
+                          window.localStorage.setItem("currentUser", userId);
+                          window.location.reload();
+                        }}
+                        name={userId}
+                        color={colorMXID(userId)}
+                      />
+                    );
+                  })
+                );
+              })()}
               <div className="auth-card__content">
                 <AuthCard />
               </div>
diff --git a/src/client/action/auth.js b/src/client/action/auth.js
index f9be13bc..19caa0ae 100644
--- a/src/client/action/auth.js
+++ b/src/client/action/auth.js
@@ -1,11 +1,19 @@
 import * as sdk from 'matrix-js-sdk';
 import cons from '../state/cons';
+import NamespacedStorage from '../state/NamespacedStorage';
 
 function updateLocalStore(accessToken, deviceId, userId, baseUrl) {
-  localStorage.setItem(cons.secretKey.ACCESS_TOKEN, accessToken);
-  localStorage.setItem(cons.secretKey.DEVICE_ID, deviceId);
-  localStorage.setItem(cons.secretKey.USER_ID, userId);
-  localStorage.setItem(cons.secretKey.BASE_URL, baseUrl);
+  window.localStorage.setItem("currentUser", userId);
+  let loggedInUsers = new Set(JSON.parse(window.localStorage.getItem("loggedInUsers")));
+  loggedInUsers.add(userId);
+  window.localStorage.setItem("loggedInUsers", JSON.stringify(Array.from(loggedInUsers)));
+
+  window.userLocalStorage = new NamespacedStorage(userId, window.localStorage);
+
+  window.userLocalStorage.setItem(cons.secretKey.ACCESS_TOKEN, accessToken);
+  window.userLocalStorage.setItem(cons.secretKey.DEVICE_ID, deviceId);
+  window.userLocalStorage.setItem(cons.secretKey.USER_ID, userId);
+  window.userLocalStorage.setItem(cons.secretKey.BASE_URL, baseUrl);
 }
 
 function createTemporaryClient(baseUrl) {
@@ -14,7 +22,7 @@ function createTemporaryClient(baseUrl) {
 
 async function startSsoLogin(baseUrl, type, idpId) {
   const client = createTemporaryClient(baseUrl);
-  localStorage.setItem(cons.secretKey.BASE_URL, client.baseUrl);
+  window.userLocalStorage.setItem(cons.secretKey.BASE_URL, client.baseUrl);
   window.location.href = client.getSsoLoginUrl(window.location.href, type, idpId);
 }
 
diff --git a/src/client/action/logout.js b/src/client/action/logout.js
index c4047bb7..caf9554f 100644
--- a/src/client/action/logout.js
+++ b/src/client/action/logout.js
@@ -9,7 +9,14 @@ async function logout() {
     // ignore if failed to logout
   }
   mx.clearStores();
-  window.localStorage.clear();
+
+  window.userLocalStorage.clear();
+  let currentUser = window.localStorage.getItem("currentUser");
+  let loggedInUsers = new Set(JSON.parse(window.localStorage.getItem("loggedInUsers")));
+  loggedInUsers.delete(currentUser);
+  window.localStorage.setItem("loggedInUsers", JSON.stringify(loggedInUsers));
+  window.localStorage.removeItem("currentUser");
+
   window.location.reload();
 }
 
diff --git a/src/client/initMatrix.js b/src/client/initMatrix.js
index e219a777..2cfbbcfd 100644
--- a/src/client/initMatrix.js
+++ b/src/client/initMatrix.js
@@ -9,6 +9,7 @@ import RoomsInput from './state/RoomsInput';
 import Notifications from './state/Notifications';
 import { cryptoCallbacks } from './state/secretStorageKeys';
 import navigation from './state/navigation';
+import NamespacedStorage from './state/NamespacedStorage';
 
 global.Olm = require('@matrix-org/olm');
 
@@ -22,16 +23,19 @@ class InitMatrix extends EventEmitter {
   }
 
   async init() {
-    await this.startClient();
+    const user = window.localStorage.getItem("currentUser");
+    window.userLocalStorage = new NamespacedStorage(user, window.localStorage);
+
+    await this.startClient(user, window.userLocalStorage);
     this.setupSync();
     this.listenEvents();
   }
 
-  async startClient() {
+  async startClient(user, storage) {
     const indexedDBStore = new sdk.IndexedDBStore({
       indexedDB: global.indexedDB,
-      localStorage: global.localStorage,
-      dbName: 'web-sync-store',
+      localStorage: storage,
+      dbName: `${user}.web-sync-store`,
     });
     await indexedDBStore.startup();
 
@@ -40,7 +44,7 @@ class InitMatrix extends EventEmitter {
       accessToken: secret.accessToken,
       userId: secret.userId,
       store: indexedDBStore,
-      cryptoStore: new sdk.IndexedDBCryptoStore(global.indexedDB, 'crypto-store'),
+      cryptoStore: new sdk.IndexedDBCryptoStore(global.indexedDB, `${user}.crypto-store`),
       deviceId: secret.deviceId,
       timelineSupport: true,
       cryptoCallbacks,
@@ -98,7 +102,7 @@ class InitMatrix extends EventEmitter {
     this.matrixClient.on('Session.logged_out', () => {
       this.matrixClient.stopClient();
       this.matrixClient.clearStores();
-      window.localStorage.clear();
+      window.userLocalStorage.clear();
       window.location.reload();
     });
   }
diff --git a/src/client/state/NamespacedStorage.js b/src/client/state/NamespacedStorage.js
new file mode 100644
index 00000000..1d2c220b
--- /dev/null
+++ b/src/client/state/NamespacedStorage.js
@@ -0,0 +1,44 @@
+class NamespacedStorage {
+  #namespace;
+  #storage;
+  #cache;
+
+  constructor(namespace, storage) {
+    this.#namespace = namespace;
+    this.#storage = storage;
+
+    this.#cache = new Set();
+    for (let i = 0; i < this.#storage.length; i++) {
+      let key = this.#storage.key(i);
+      if (key.startsWith(`${this.#namespace}.`)) {
+        this.#cache.add(key.replace(`${this.#namespace}.`, ""));
+      }
+    }
+  }
+
+  key(n) {
+    return this.#cache[n];
+  }
+
+  getItem(key) {
+    return this.#storage.getItem(`${this.#namespace}.${key}`);
+  }
+
+  setItem(key, value) {
+    this.#storage.setItem(`${this.#namespace}.${key}`, value);
+    this.#cache.add(key);
+  }
+
+  removeItem(key) {
+    this.#storage.removeItem(`${this.#namespace}.${key}`);
+    this.#cache.delete(key);
+  }
+
+  clear() {
+    for (let key of this.#cache) {
+      this.removeItem(key);
+    }
+  }
+}
+
+export default NamespacedStorage;
diff --git a/src/client/state/auth.js b/src/client/state/auth.js
index fbc23f6f..9fc4142a 100644
--- a/src/client/state/auth.js
+++ b/src/client/state/auth.js
@@ -1,7 +1,10 @@
 import cons from './cons';
+import NamespacedStorage from './NamespacedStorage';
 
 function getSecret(key) {
-  return localStorage.getItem(key);
+  const user = global.localStorage.getItem("currentUser");
+  const storage = new NamespacedStorage(user, global.localStorage);
+  return storage.getItem(key);
 }
 
 const isAuthenticated = () => getSecret(cons.secretKey.ACCESS_TOKEN) !== null;
diff --git a/src/client/state/settings.js b/src/client/state/settings.js
index 32f55fcc..0c442d26 100644
--- a/src/client/state/settings.js
+++ b/src/client/state/settings.js
@@ -4,7 +4,7 @@ import appDispatcher from '../dispatcher';
 import cons from './cons';
 
 function getSettings() {
-  const settings = localStorage.getItem('settings');
+  const settings = window.localStorage.getItem('settings');
   if (settings === null) return null;
   return JSON.parse(settings);
 }
@@ -13,7 +13,7 @@ function setSettings(key, value) {
   let settings = getSettings();
   if (settings === null) settings = {};
   settings[key] = value;
-  localStorage.setItem('settings', JSON.stringify(settings));
+  window.localStorage.setItem('settings', JSON.stringify(settings));
 }
 
 class Settings extends EventEmitter {