diff --git a/packages/frontend/src/boot/main-boot.ts b/packages/frontend/src/boot/main-boot.ts
index 2187acd851ce..d7de09e8c6cb 100644
--- a/packages/frontend/src/boot/main-boot.ts
+++ b/packages/frontend/src/boot/main-boot.ts
@@ -30,6 +30,7 @@ export async function mainBoot() {
 		!$i ? defineAsyncComponent(() => import('@/ui/visitor.vue')) :
 		ui === 'deck' ? defineAsyncComponent(() => import('@/ui/deck.vue')) :
 		ui === 'classic' ? defineAsyncComponent(() => import('@/ui/classic.vue')) :
+		ui === 'note' ? defineAsyncComponent(() => import('@/ui/note.vue')) :
 		defineAsyncComponent(() => import('@/ui/universal.vue')),
 	));
 
diff --git a/packages/frontend/src/navbar.ts b/packages/frontend/src/navbar.ts
index cd204c4a6de3..ec87e25aa730 100644
--- a/packages/frontend/src/navbar.ts
+++ b/packages/frontend/src/navbar.ts
@@ -146,6 +146,13 @@ export const navbarItemDef = reactive({
 					miLocalStorage.setItem('ui', 'classic');
 					unisonReload();
 				},
+			}, {
+				text: i18n.ts.note,
+				active: ui === 'note',
+				action: () => {
+					miLocalStorage.setItem('ui', 'note');
+					unisonReload();
+				}
 			}], ev.currentTarget ?? ev.target);
 		},
 	},
diff --git a/packages/frontend/src/ui/note.vue b/packages/frontend/src/ui/note.vue
new file mode 100644
index 000000000000..da2e065d04e5
--- /dev/null
+++ b/packages/frontend/src/ui/note.vue
@@ -0,0 +1,505 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+	<div :class="$style.root">
+		<XSidebar v-if="!isMobile" :class="$style.sidebar"/>
+
+		<MkStickyContainer
+			ref="contents"
+			:class="$style.contents"
+			style="container-type: inline-size;"
+		>
+			<template #header>
+				<div>
+					<XAnnouncements v-if="$i" />
+					<XStatusBars :class="$style.statusbars" />
+				</div>
+			</template>
+
+			<template v-if="isNotePage">
+				<MkSpacer :contentMax="800">
+				<MkPostForm :class="$style.postForm" class="post-form _panel" fixed style="margin-bottom: var(--MI-margin);"/>
+				</MkSpacer>
+			</template>
+			<template v-else>
+				<RouterView />
+			</template>
+		</MkStickyContainer>
+
+		<div v-if="isDesktop && !pageMetadata?.needWideArea" :class="$style.widgets">
+			<XWidgets/>
+		</div>
+
+		<button v-if="(!isDesktop || pageMetadata?.needWideArea) && !isMobile" :class="$style.widgetButton" class="_button" @click="widgetsShowing = true"><i class="ti ti-apps"></i></button>
+
+		<div v-if="isMobile" ref="navFooter" :class="$style.nav">
+			<button :class="$style.navButton" class="_button" @click="drawerMenuShowing = true"><i :class="$style.navButtonIcon" class="ti ti-menu-2"></i><span v-if="menuIndicated" :class="$style.navButtonIndicator" class="_blink"><i class="_indicatorCircle"></i></span></button>
+			<button :class="$style.navButton" class="_button" @click="isRoot ? top() : mainRouter.push('/')"><i :class="$style.navButtonIcon" class="ti ti-home"></i></button>
+			<button :class="$style.navButton" class="_button" @click="mainRouter.push('/my/notifications')">
+				<i :class="$style.navButtonIcon" class="ti ti-bell"></i>
+				<span v-if="$i?.hasUnreadNotification" :class="$style.navButtonIndicator" class="_blink">
+				<span class="_indicateCounter" :class="$style.itemIndicateValueIcon">{{ $i.unreadNotificationsCount > 99 ? '99+' : $i.unreadNotificationsCount }}</span>
+			</span>
+			</button>
+			<button :class="$style.navButton" class="_button" @click="widgetsShowing = true"><i :class="$style.navButtonIcon" class="ti ti-apps"></i></button>
+			<button :class="$style.postButton" class="_button" @click="os.post()"><i :class="$style.navButtonIcon" class="ti ti-pencil"></i></button>
+		</div>
+
+		<Transition
+			:enterActiveClass="defaultStore.state.animation ? $style.transition_menuDrawerBg_enterActive : ''"
+			:leaveActiveClass="defaultStore.state.animation ? $style.transition_menuDrawerBg_leaveActive : ''"
+			:enterFromClass="defaultStore.state.animation ? $style.transition_menuDrawerBg_enterFrom : ''"
+			:leaveToClass="defaultStore.state.animation ? $style.transition_menuDrawerBg_leaveTo : ''"
+		>
+			<div
+				v-if="drawerMenuShowing"
+				:class="$style.menuDrawerBg"
+				class="_modalBg"
+				@click="drawerMenuShowing = false"
+				@touchstart.passive="drawerMenuShowing = false"
+			></div>
+		</Transition>
+
+		<Transition
+			:enterActiveClass="defaultStore.state.animation ? $style.transition_menuDrawer_enterActive : ''"
+			:leaveActiveClass="defaultStore.state.animation ? $style.transition_menuDrawer_leaveActive : ''"
+			:enterFromClass="defaultStore.state.animation ? $style.transition_menuDrawer_enterFrom : ''"
+			:leaveToClass="defaultStore.state.animation ? $style.transition_menuDrawer_leaveTo : ''"
+		>
+			<div v-if="drawerMenuShowing" :class="$style.menuDrawer">
+				<XDrawerMenu/>
+			</div>
+		</Transition>
+
+		<Transition
+			:enterActiveClass="defaultStore.state.animation ? $style.transition_widgetsDrawerBg_enterActive : ''"
+			:leaveActiveClass="defaultStore.state.animation ? $style.transition_widgetsDrawerBg_leaveActive : ''"
+			:enterFromClass="defaultStore.state.animation ? $style.transition_widgetsDrawerBg_enterFrom : ''"
+			:leaveToClass="defaultStore.state.animation ? $style.transition_widgetsDrawerBg_leaveTo : ''"
+		>
+			<div
+				v-if="widgetsShowing"
+				:class="$style.widgetsDrawerBg"
+				class="_modalBg"
+				@click="widgetsShowing = false"
+				@touchstart.passive="widgetsShowing = false"
+			></div>
+		</Transition>
+
+		<Transition
+			:enterActiveClass="defaultStore.state.animation ? $style.transition_widgetsDrawer_enterActive : ''"
+			:leaveActiveClass="defaultStore.state.animation ? $style.transition_widgetsDrawer_leaveActive : ''"
+			:enterFromClass="defaultStore.state.animation ? $style.transition_widgetsDrawer_enterFrom : ''"
+			:leaveToClass="defaultStore.state.animation ? $style.transition_widgetsDrawer_leaveTo : ''"
+		>
+			<div v-if="widgetsShowing" :class="$style.widgetsDrawer">
+				<button class="_button" :class="$style.widgetsCloseButton" @click="widgetsShowing = false"><i class="ti ti-x"></i></button>
+				<XWidgets/>
+			</div>
+		</Transition>
+
+		<XCommon/>
+	</div>
+</template>
+
+<script lang="ts" setup>
+import { defineAsyncComponent, provide, onMounted, computed, ref, watch, shallowRef, Ref } from 'vue';
+import { instanceName } from '@@/js/config.js';
+import { CURRENT_STICKY_BOTTOM } from '@@/js/const.js';
+import { isLink } from '@@/js/is-link.js';
+import XCommon from './_common_/common.vue';
+import type MkStickyContainer from '@/components/global/MkStickyContainer.vue';
+import XDrawerMenu from '@/ui/_common_/navbar-for-mobile.vue';
+import * as os from '@/os.js';
+import { defaultStore } from '@/store.js';
+import { navbarItemDef } from '@/navbar.js';
+import { i18n } from '@/i18n.js';
+import { $i } from '@/account.js';
+import { PageMetadata, provideMetadataReceiver, provideReactiveMetadata } from '@/scripts/page-metadata.js';
+import { deviceKind } from '@/scripts/device-kind.js';
+import { miLocalStorage } from '@/local-storage.js';
+import { useScrollPositionManager } from '@/nirax.js';
+import { mainRouter } from '@/router/main.js';
+import MkPostForm from "@/components/MkPostForm.vue";
+
+const XWidgets = defineAsyncComponent(() => import('./universal.widgets.vue'));
+const XSidebar = defineAsyncComponent(() => import('@/ui/_common_/navbar.vue'));
+const XStatusBars = defineAsyncComponent(() => import('@/ui/_common_/statusbars.vue'));
+const XAnnouncements = defineAsyncComponent(() => import('@/ui/_common_/announcements.vue'));
+
+const isRoot = computed(() => mainRouter.currentRoute.value.name === 'index');
+const isNotePage = computed(() => mainRouter.currentRoute.value.path === '/');
+
+const DESKTOP_THRESHOLD = 1100;
+const MOBILE_THRESHOLD = 500;
+
+// デスクトップでウィンドウを狭くしたときモバイルUIが表示されて欲しいことはあるので deviceKind === 'desktop' の判定は行わない
+const isDesktop = ref(window.innerWidth >= DESKTOP_THRESHOLD);
+const isMobile = ref(deviceKind === 'smartphone' || window.innerWidth <= MOBILE_THRESHOLD);
+window.addEventListener('resize', () => {
+	isMobile.value = deviceKind === 'smartphone' || window.innerWidth <= MOBILE_THRESHOLD;
+});
+
+const pageMetadata = ref<null | PageMetadata>(null);
+const widgetsShowing = ref(false);
+const navFooter = shallowRef<HTMLElement>();
+const contents = shallowRef<InstanceType<typeof MkStickyContainer>>();
+
+provide('router', mainRouter);
+provideMetadataReceiver((metadataGetter) => {
+	const info = metadataGetter();
+	pageMetadata.value = info;
+	if (pageMetadata.value) {
+		if (isRoot.value && pageMetadata.value.title === instanceName) {
+			document.title = pageMetadata.value.title;
+		} else {
+			document.title = `${pageMetadata.value.title} | ${instanceName}`;
+		}
+	}
+});
+provideReactiveMetadata(pageMetadata);
+
+const menuIndicated = computed(() => {
+	for (const def in navbarItemDef) {
+		if (def === 'notifications') continue; // 通知は下にボタンとして表示されてるから
+		if (navbarItemDef[def].indicated) return true;
+	}
+	return false;
+});
+
+const drawerMenuShowing = ref(false);
+
+mainRouter.on('change', () => {
+	drawerMenuShowing.value = false;
+});
+
+if (window.innerWidth > 1024) {
+	const tempUI = miLocalStorage.getItem('ui_temp');
+	if (tempUI) {
+		miLocalStorage.setItem('ui', tempUI);
+		miLocalStorage.removeItem('ui_temp');
+		location.reload();
+	}
+}
+
+defaultStore.loaded.then(() => {
+	if (defaultStore.state.widgets.length === 0) {
+		defaultStore.set('widgets', [{
+			name: 'calendar',
+			id: 'a', place: 'right', data: {},
+		}, {
+			name: 'notifications',
+			id: 'b', place: 'right', data: {},
+		}, {
+			name: 'trends',
+			id: 'c', place: 'right', data: {},
+		}]);
+	}
+});
+
+onMounted(() => {
+	if (!isDesktop.value) {
+		window.addEventListener('resize', () => {
+			if (window.innerWidth >= DESKTOP_THRESHOLD) isDesktop.value = true;
+		}, { passive: true });
+	}
+});
+
+const onContextmenu = (ev) => {
+	if (isLink(ev.target)) return;
+	if (['INPUT', 'TEXTAREA', 'IMG', 'VIDEO', 'CANVAS'].includes(ev.target.tagName) || ev.target.attributes['contenteditable']) return;
+	if (window.getSelection()?.toString() !== '') return;
+	const path = mainRouter.getCurrentPath();
+	os.contextMenu([{
+		type: 'label',
+		text: path,
+	}, {
+		icon: 'ti ti-window-maximize',
+		text: i18n.ts.openInWindow,
+		action: () => {
+			os.pageWindow(path);
+		},
+	}], ev);
+};
+
+function top() {
+	contents.value.rootEl.scrollTo({
+		top: 0,
+		behavior: 'smooth',
+	});
+}
+
+const navFooterHeight = ref(0);
+provide<Ref<number>>(CURRENT_STICKY_BOTTOM, navFooterHeight);
+
+watch(navFooter, () => {
+	if (navFooter.value) {
+		navFooterHeight.value = navFooter.value.offsetHeight;
+		document.body.style.setProperty('--MI-stickyBottom', `${navFooterHeight.value}px`);
+		document.body.style.setProperty('--MI-minBottomSpacing', 'var(--MI-minBottomSpacingMobile)');
+	} else {
+		navFooterHeight.value = 0;
+		document.body.style.setProperty('--MI-stickyBottom', '0px');
+		document.body.style.setProperty('--MI-minBottomSpacing', '0px');
+	}
+}, {
+	immediate: true,
+});
+
+useScrollPositionManager(() => contents.value.rootEl, mainRouter);
+</script>
+
+<style>
+html,
+body {
+	width: 100%;
+	height: 100%;
+	overflow: clip;
+	position: fixed;
+	top: 0;
+	left: 0;
+	overscroll-behavior: none;
+}
+
+#misskey_app {
+	width: 100%;
+	height: 100%;
+	overflow: clip;
+	position: absolute;
+	top: 0;
+	left: 0;
+}
+</style>
+
+<style lang="scss" module>
+$ui-font-size: 1em; // TODO: どこかに集約したい
+$widgets-hide-threshold: 1090px;
+
+.transition_menuDrawerBg_enterActive,
+.transition_menuDrawerBg_leaveActive {
+	opacity: 1;
+	transition: opacity 300ms cubic-bezier(0.23, 1, 0.32, 1);
+}
+.transition_menuDrawerBg_enterFrom,
+.transition_menuDrawerBg_leaveTo {
+	opacity: 0;
+}
+
+.transition_menuDrawer_enterActive,
+.transition_menuDrawer_leaveActive {
+	opacity: 1;
+	transform: translateX(0);
+	transition: transform 300ms cubic-bezier(0.23, 1, 0.32, 1), opacity 300ms cubic-bezier(0.23, 1, 0.32, 1);
+}
+.transition_menuDrawer_enterFrom,
+.transition_menuDrawer_leaveTo {
+	opacity: 0;
+	transform: translateX(-240px);
+}
+
+.transition_widgetsDrawerBg_enterActive,
+.transition_widgetsDrawerBg_leaveActive {
+	opacity: 1;
+	transition: opacity 300ms cubic-bezier(0.23, 1, 0.32, 1);
+}
+.transition_widgetsDrawerBg_enterFrom,
+.transition_widgetsDrawerBg_leaveTo {
+	opacity: 0;
+}
+
+.transition_widgetsDrawer_enterActive,
+.transition_widgetsDrawer_leaveActive {
+	opacity: 1;
+	transform: translateX(0);
+	transition: transform 300ms cubic-bezier(0.23, 1, 0.32, 1), opacity 300ms cubic-bezier(0.23, 1, 0.32, 1);
+}
+.transition_widgetsDrawer_enterFrom,
+.transition_widgetsDrawer_leaveTo {
+	opacity: 0;
+	transform: translateX(240px);
+}
+
+.root {
+	height: 100dvh;
+	overflow: clip;
+	contain: strict;
+	box-sizing: border-box;
+	display: flex;
+}
+
+.sidebar {
+	border-right: solid 0.5px var(--MI_THEME-divider);
+}
+
+.contents {
+	flex: 1;
+	height: 100%;
+	min-width: 0;
+	overflow: auto;
+	overflow-y: scroll;
+	overscroll-behavior: contain;
+	background: var(--MI_THEME-bg);
+}
+
+.postForm {
+	border-radius: var(--MI-radius);
+}
+
+.widgets {
+	width: 350px;
+	height: 100%;
+	box-sizing: border-box;
+	overflow: auto;
+	padding: var(--MI-margin) var(--MI-margin) calc(var(--MI-margin) + env(safe-area-inset-bottom, 0px));
+	border-left: solid 0.5px var(--MI_THEME-divider);
+	background: var(--MI_THEME-bg);
+
+	@media (max-width: $widgets-hide-threshold) {
+		display: none;
+	}
+}
+
+.widgetButton {
+	display: block;
+	position: fixed;
+	z-index: 1000;
+	bottom: 32px;
+	right: 32px;
+	width: 64px;
+	height: 64px;
+	border-radius: 100%;
+	box-shadow: 0 3px 5px -1px rgba(0, 0, 0, 0.2), 0 6px 10px 0 rgba(0, 0, 0, 0.14), 0 1px 18px 0 rgba(0, 0, 0, 0.12);
+	font-size: 22px;
+	background: var(--MI_THEME-panel);
+}
+
+.widgetsDrawerBg {
+	z-index: 1001;
+}
+
+.widgetsDrawer {
+	position: fixed;
+	top: 0;
+	right: 0;
+	z-index: 1001;
+	width: 310px;
+	height: 100dvh;
+	padding: var(--MI-margin) var(--MI-margin) calc(var(--MI-margin) + env(safe-area-inset-bottom, 0px)) !important;
+	box-sizing: border-box;
+	overflow: auto;
+	overscroll-behavior: contain;
+	background: var(--MI_THEME-bg);
+}
+
+.widgetsCloseButton {
+	padding: 8px;
+	display: block;
+	margin: 0 auto;
+}
+
+@media (min-width: 370px) {
+	.widgetsCloseButton {
+		display: none;
+	}
+}
+
+.nav {
+	position: fixed;
+	z-index: 1000;
+	bottom: 0;
+	left: 0;
+	padding: 12px 12px max(12px, env(safe-area-inset-bottom, 0px)) 12px;
+	display: grid;
+	grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
+	grid-gap: 8px;
+	width: 100%;
+	box-sizing: border-box;
+	-webkit-backdrop-filter: var(--MI-blur, blur(24px));
+	backdrop-filter: var(--MI-blur, blur(24px));
+	background-color: var(--MI_THEME-header);
+	border-top: solid 0.5px var(--MI_THEME-divider);
+}
+
+.navButton {
+	position: relative;
+	padding: 0;
+	aspect-ratio: 1;
+	width: 100%;
+	max-width: 60px;
+	margin: auto;
+	border-radius: 100%;
+	background: var(--MI_THEME-panel);
+	color: var(--MI_THEME-fg);
+
+	&:hover {
+		background: var(--MI_THEME-panelHighlight);
+	}
+
+	&:active {
+		background: hsl(from var(--MI_THEME-panel) h s calc(l - 2));
+	}
+}
+
+.postButton {
+	composes: navButton;
+	background: linear-gradient(90deg, var(--MI_THEME-buttonGradateA), var(--MI_THEME-buttonGradateB));
+	color: var(--MI_THEME-fgOnAccent);
+
+	&:hover {
+		background: linear-gradient(90deg, hsl(from var(--MI_THEME-accent) h s calc(l + 5)), hsl(from var(--MI_THEME-accent) h s calc(l + 5)));
+	}
+
+	&:active {
+		background: linear-gradient(90deg, hsl(from var(--MI_THEME-accent) h s calc(l + 5)), hsl(from var(--MI_THEME-accent) h s calc(l + 5)));
+	}
+}
+
+.navButtonIcon {
+	font-size: 18px;
+	vertical-align: middle;
+}
+
+.navButtonIndicator {
+	position: absolute;
+	top: 0;
+	left: 0;
+	color: var(--MI_THEME-indicator);
+	font-size: 16px;
+
+	&:has(.itemIndicateValueIcon) {
+		animation: none;
+		font-size: 12px;
+	}
+}
+
+.menuDrawerBg {
+	z-index: 1001;
+}
+
+.menuDrawer {
+	position: fixed;
+	top: 0;
+	left: 0;
+	z-index: 1001;
+	height: 100dvh;
+	width: 240px;
+	box-sizing: border-box;
+	contain: strict;
+	overflow: auto;
+	overscroll-behavior: contain;
+	background: var(--MI_THEME-navBg);
+}
+
+.statusbars {
+	position: sticky;
+	top: 0;
+	left: 0;
+}
+
+.spacer {
+	height: calc(var(--MI-minBottomSpacing));
+}
+</style>