diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0aa06bc..bb0ceab 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 - Added "Aliases" page.
 - Form for adding aliases.
+- Store appearance settings on server.
+
+### Changed
+
+- Move dark mode toggle out of "Experiments" section.
 
 ## [1.19.0] - 2023-03-30
 
diff --git a/src/api/settings.ts b/src/api/settings.ts
index 1cec7e1..2b020c6 100644
--- a/src/api/settings.ts
+++ b/src/api/settings.ts
@@ -1,7 +1,25 @@
-import { BACKEND_URL } from "@/constants"
+import { APP_NAME, BACKEND_URL } from "@/constants"
 import { http } from "./common"
 import { Aliases, User } from "./users"
 
+export async function updateClientConfig(
+  authToken: string,
+  clientConfig: { [property: string]: any },
+): Promise<User> {
+  const url = `${BACKEND_URL}/api/v1/settings/client_config`
+  const response = await http(url, {
+    method: "POST",
+    json: { [APP_NAME]: clientConfig },
+    authToken,
+  })
+  const data = await response.json()
+  if (response.status !== 200) {
+    throw new Error(data.error_description)
+  } else {
+    return data
+  }
+}
+
 export async function changePassword(
   authToken: string,
   newPassword: string,
diff --git a/src/api/users.ts b/src/api/users.ts
index fd3c1b7..d5c1958 100644
--- a/src/api/users.ts
+++ b/src/api/users.ts
@@ -83,6 +83,7 @@ export function defaultProfile(): Profile {
 export interface User extends Profile {
   source: Source;
   role: Role,
+  client_config: { [clientName: string]: { [property: string]: any } },
 }
 
 export interface ProfileWrapper extends Profile {}
diff --git a/src/composables/theme.ts b/src/composables/theme.ts
index d0bf9ab..631abb2 100644
--- a/src/composables/theme.ts
+++ b/src/composables/theme.ts
@@ -1,6 +1,8 @@
 import { ref } from "vue"
 
-const THEME_STORAGE_KEY = "theme"
+import { updateClientConfig } from "@/api/settings"
+import { APP_NAME } from "@/constants"
+import { useCurrentUser } from "@/store/user"
 
 enum Theme {
   Light = "light",
@@ -14,20 +16,39 @@ export function useTheme() {
   function setTheme(theme: Theme) {
     document.documentElement.setAttribute("data-theme", theme)
     currentTheme.value = theme
-    localStorage.setItem(THEME_STORAGE_KEY, theme)
+  }
+
+  async function persistTheme(theme: Theme) {
+    const {
+      ensureAuthToken,
+      ensureCurrentUser,
+      setCurrentUser,
+    } = useCurrentUser()
+    const currentUser = ensureCurrentUser()
+    let clientConfig = currentUser.client_config[APP_NAME] || {}
+    clientConfig = { ...clientConfig, theme }
+    const authToken = ensureAuthToken()
+    const user = await updateClientConfig(authToken, clientConfig)
+    setCurrentUser(user)
   }
 
   function loadTheme() {
-    const theme = localStorage.getItem(THEME_STORAGE_KEY) || Theme.Light
+    const { ensureCurrentUser } = useCurrentUser()
+    const currentUser = ensureCurrentUser()
+    const clientConfig = currentUser.client_config[APP_NAME] || {}
+    const theme = clientConfig.theme || Theme.Light
     setTheme(theme as Theme)
   }
 
-  function toggleDarkMode() {
+  async function toggleDarkMode() {
+    let theme
     if (currentTheme.value === Theme.Light) {
-      setTheme(Theme.Dark)
+      theme = Theme.Dark
     } else {
-      setTheme(Theme.Light)
+      theme = Theme.Light
     }
+    setTheme(theme)
+    await persistTheme(theme)
   }
 
   return {
diff --git a/src/constants.ts b/src/constants.ts
index 561882a..9a7bef0 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -1,4 +1,5 @@
 export const ENV = process.env.NODE_ENV
 
 export const BACKEND_URL = process.env.VUE_APP_BACKEND_URL
+export const APP_NAME = "mitra-web"
 export const APP_VERSION = process.env.VUE_APP_VERSION
diff --git a/src/views/Settings.vue b/src/views/Settings.vue
index 263447d..55063b5 100644
--- a/src/views/Settings.vue
+++ b/src/views/Settings.vue
@@ -11,6 +11,16 @@
           Edit profile
         </router-link>
       </section>
+      <section>
+        <h2>Appearance</h2>
+        <button
+          class="btn"
+          @click="onToggleDarkMode()"
+          :disabled="isLoading"
+        >
+          Toggle dark mode
+        </button>
+      </section>
       <section>
         <h2>Change password</h2>
         <form @submit.prevent="onChangePassword()">
@@ -70,9 +80,6 @@
             <router-link class="btn" :to="{ name: 'move-followers' }">
               Move followers
             </router-link>
-            <button class="btn" @click="toggleDarkMode()">
-              Toggle dark mode
-            </button>
           </div>
         </details>
       </section>
@@ -93,6 +100,13 @@ const { toggleDarkMode } = useTheme()
 let newPassword = $ref("")
 let newPasswordConfirmation = $ref("")
 let passwordFormMessage = $ref<string | null>(null)
+let isLoading = $ref(false)
+
+async function onToggleDarkMode() {
+  isLoading = true
+  await toggleDarkMode()
+  isLoading = false
+}
 
 function canChangePassword(): boolean {
   return newPassword && newPassword === newPasswordConfirmation