diff --git a/apps/stage-web/src/composables/theme-color.ts b/apps/stage-web/src/composables/theme-color.ts
new file mode 100644
index 000000000..145ecc84e
--- /dev/null
+++ b/apps/stage-web/src/composables/theme-color.ts
@@ -0,0 +1,46 @@
+import Color from 'colorjs.io'
+
+import { withRetry } from '@moeru/std'
+import { useDark } from '@vueuse/core'
+
+export function themeColorFromPropertyOf(colorFromClass: string, property: string): () => Promise<string> {
+  return async () => {
+    const fetchUntilWidgetMounted = withRetry(() => {
+      const widgets = document.querySelector(colorFromClass) as HTMLDivElement | undefined
+      if (!widgets)
+        throw new Error('Widgets element not found')
+
+      return widgets
+    }, { retry: 10, retryDelay: 1000 })
+
+    const widgets = await fetchUntilWidgetMounted()
+    return window.getComputedStyle(widgets).getPropertyValue(property)
+  }
+}
+
+export function themeColorFromValue(value: string | { light: string, dark: string }): () => Promise<string> {
+  return async () => {
+    if (typeof value === 'string') {
+      return value
+    }
+    else {
+      const dark = useDark()
+      return dark.value ? value.dark : value.light
+    }
+  }
+}
+
+export function useThemeColor(colorFrom: () => string | Promise<string>) {
+  async function updateThemeColor() {
+    if (!('document' in globalThis && globalThis.document != null))
+      return
+    if (!('window' in globalThis && globalThis.window != null))
+      return
+
+    document.querySelector('meta[name="theme-color"]')?.setAttribute('content', new Color(await colorFrom()).to('srgb').toString({ format: 'hex' }))
+  }
+
+  return {
+    updateThemeColor,
+  }
+}
diff --git a/apps/stage-web/src/layouts/settings.vue b/apps/stage-web/src/layouts/settings.vue
index 836d010c4..ced0136a7 100644
--- a/apps/stage-web/src/layouts/settings.vue
+++ b/apps/stage-web/src/layouts/settings.vue
@@ -1,14 +1,18 @@
 <script setup lang="ts">
 import { PageHeader } from '@proj-airi/stage-ui/components'
 import { useProvidersStore } from '@proj-airi/stage-ui/stores'
+import { useDark } from '@vueuse/core'
 import { storeToRefs } from 'pinia'
-import { computed } from 'vue'
+import { computed, onMounted, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { RouterView, useRoute } from 'vue-router'
 
 import HeaderLink from '../components/Layouts/HeaderLink.vue'
 
+import { themeColorFromValue, useThemeColor } from '../composables/theme-color'
+
 const route = useRoute()
+const dark = useDark()
 const { t } = useI18n()
 const providersStore = useProvidersStore()
 const { allProvidersMetadata } = storeToRefs(providersStore)
@@ -108,6 +112,11 @@ const routeHeaderMetadataMap = computed(() => {
 
 // const activeSettingsTutorial = ref('default')
 const routeHeaderMetadata = computed(() => routeHeaderMetadataMap.value[route.path])
+
+const { updateThemeColor } = useThemeColor(themeColorFromValue({ light: 'rgb(255 255 255)', dark: 'rgb(18 18 18)' }))
+watch(dark, () => updateThemeColor(), { immediate: true })
+watch(route, () => updateThemeColor(), { immediate: true })
+onMounted(() => updateThemeColor())
 </script>
 
 <template>
diff --git a/apps/stage-web/src/pages/index.vue b/apps/stage-web/src/pages/index.vue
index 88b985662..5e329115e 100644
--- a/apps/stage-web/src/pages/index.vue
+++ b/apps/stage-web/src/pages/index.vue
@@ -1,7 +1,4 @@
 <script setup lang="ts">
-import Color from 'colorjs.io'
-
-import { withRetry } from '@moeru/std'
 import { WidgetStage } from '@proj-airi/stage-ui/components/scenes'
 import { breakpointsTailwind, useBreakpoints, useDark, useMouse } from '@vueuse/core'
 import { onMounted, ref, watch } from 'vue'
@@ -12,6 +9,8 @@ import InteractiveArea from '../components/Layouts/InteractiveArea.vue'
 import MobileInteractiveArea from '../components/Layouts/MobileInteractiveArea.vue'
 import AnimatedWave from '../components/Widgets/AnimatedWave.vue'
 
+import { themeColorFromPropertyOf, useThemeColor } from '../composables/theme-color'
+
 const dark = useDark()
 const paused = ref(false)
 
@@ -23,25 +22,7 @@ const positionCursor = useMouse()
 const breakpoints = useBreakpoints(breakpointsTailwind)
 const isMobile = breakpoints.smaller('md')
 
-async function updateThemeColor() {
-  if (!('document' in globalThis && globalThis.document != null))
-    return
-  if (!('window' in globalThis && globalThis.window != null))
-    return
-
-  const fetchUntilWidgetMounted = withRetry(() => {
-    const widgets = document.querySelector('.widgets.top-widgets .colored-area') as HTMLDivElement | undefined
-    if (!widgets)
-      throw new Error('Widgets element not found')
-
-    return widgets
-  }, { retry: 10, retryDelay: 1000 })
-
-  const widgets = await fetchUntilWidgetMounted()
-  const backgroundColor = window.getComputedStyle(widgets).getPropertyValue('background-color')
-  document.querySelector('meta[name="theme-color"]')?.setAttribute('content', new Color(backgroundColor).to('srgb').toString({ format: 'hex' }))
-}
-
+const { updateThemeColor } = useThemeColor(themeColorFromPropertyOf('.widgets.top-widgets .colored-area', 'background-color'))
 watch(dark, () => updateThemeColor(), { immediate: true })
 onMounted(() => updateThemeColor())
 </script>