diff --git a/src/web/app/common/mios.ts b/src/web/app/common/mios.ts
index 6cc441cd1..3701a24c3 100644
--- a/src/web/app/common/mios.ts
+++ b/src/web/app/common/mios.ts
@@ -27,7 +27,7 @@ export type API = {
 	dialog: (opts: {
 		title: string;
 		text: string;
-		actions: Array<{
+		actions?: Array<{
 			text: string;
 			id?: string;
 		}>;
diff --git a/src/web/app/common/scripts/check-for-update.ts b/src/web/app/common/scripts/check-for-update.ts
index fe539407d..3e7eb79d8 100644
--- a/src/web/app/common/scripts/check-for-update.ts
+++ b/src/web/app/common/scripts/check-for-update.ts
@@ -1,8 +1,8 @@
 import MiOS from '../mios';
 import { version } from '../../config';
 
-export default async function(mios: MiOS) {
-	const meta = await mios.getMeta();
+export default async function(mios: MiOS, force = false, silent = false) {
+	const meta = await mios.getMeta(force);
 
 	if (meta.version != version) {
 		localStorage.setItem('should-refresh', 'true');
@@ -20,6 +20,12 @@ export default async function(mios: MiOS) {
 			console.error(e);
 		}
 
-		alert('%i18n:common.update-available%'.replace('{newer}', meta.version).replace('{current}', version));
+		if (!silent) {
+			alert('%i18n:common.update-available%'.replace('{newer}', meta.version).replace('{current}', version));
+		}
+
+		return meta.version;
+	} else {
+		return null;
 	}
 }
diff --git a/src/web/app/common/views/components/index.ts b/src/web/app/common/views/components/index.ts
index ab0f1767d..527492022 100644
--- a/src/web/app/common/views/components/index.ts
+++ b/src/web/app/common/views/components/index.ts
@@ -20,6 +20,7 @@ import messagingRoom from './messaging-room.vue';
 import urlPreview from './url-preview.vue';
 import twitterSetting from './twitter-setting.vue';
 import fileTypeIcon from './file-type-icon.vue';
+import Switch from './switch.vue';
 
 Vue.component('mk-signin', signin);
 Vue.component('mk-signup', signup);
@@ -41,3 +42,4 @@ Vue.component('mk-messaging-room', messagingRoom);
 Vue.component('mk-url-preview', urlPreview);
 Vue.component('mk-twitter-setting', twitterSetting);
 Vue.component('mk-file-type-icon', fileTypeIcon);
+Vue.component('mk-switch', Switch);
diff --git a/src/web/app/common/views/components/switch.vue b/src/web/app/common/views/components/switch.vue
new file mode 100644
index 000000000..fc12e0054
--- /dev/null
+++ b/src/web/app/common/views/components/switch.vue
@@ -0,0 +1,170 @@
+<template>
+<div
+	class="mk-switch"
+	:class="{ disabled, checked }"
+	role="switch"
+	:aria-checked="checked"
+	:aria-disabled="disabled"
+	@click="switchValue"
+	@mouseover="mouseenter"
+>
+	<input
+		type="checkbox"
+		@change="handleChange"
+		ref="input"
+		:disabled="disabled"
+		@keydown.enter="switchValue"
+	>
+	<span class="button">
+		<span :style="{ transform }"></span>
+	</span>
+	<span class="label">
+		<span :aria-hidden="!checked">{{ text }}</span>
+		<p :aria-hidden="!checked">
+			<slot></slot>
+		</p>
+	</span>
+</div>
+</template>
+
+<script lang="ts">
+import Vue from 'vue';
+export default Vue.extend({
+	props: {
+		value: {
+			type: Boolean,
+			default: false
+		},
+		disabled: {
+			type: Boolean,
+			default: false
+		},
+		text: String
+	},/*
+	created() {
+		if (!~[true, false].indexOf(this.value)) {
+			this.$emit('input', false);
+		}
+	},*/
+	computed: {
+		checked(): boolean {
+			return this.value;
+		},
+		transform(): string {
+			return this.checked ? 'translate3d(20px, 0, 0)' : '';
+		}
+	},
+	watch: {
+		value() {
+			(this.$refs.input as any).checked = this.checked;
+		}
+	},
+	mounted() {
+		(this.$refs.input as any).checked = this.checked;
+	},
+	methods: {
+		mouseenter() {
+			(this.$el).style.transition = 'all 0s';
+		},
+		handleChange() {
+			(this.$el).style.transition = 'all 0.3s';
+			this.$emit('input', !this.checked);
+			this.$emit('change', !this.checked);
+			this.$nextTick(() => {
+				// set input's checked property
+				// in case parent refuses to change component's value
+				(this.$refs.input as any).checked = this.checked;
+			});
+		},
+		switchValue() {
+			!this.disabled && this.handleChange();
+		}
+	}
+});
+</script>
+
+<style lang="stylus" scoped>
+.mk-switch
+	display flex
+	cursor pointer
+	transition all 0.3s
+
+	> *
+		user-select none
+
+	&.disabled
+		opacity 0.6
+		cursor not-allowed
+
+	&.checked
+		> .button
+			background-color $theme-color
+			border-color $theme-color
+
+		> .label
+			> span
+				color $theme-color
+
+		&:hover
+			> .label
+				> span
+					color darken($theme-color, 10%)
+
+			> .button
+				background darken($theme-color, 10%)
+				border-color darken($theme-color, 10%)
+
+	&:hover
+		> .label
+			> span
+				color #2e3338
+
+		> .button
+			background #ced2da
+			border-color #ced2da
+
+	> input
+		position absolute
+		width 0
+		height 0
+		opacity 0
+		margin 0
+
+	> .button
+		display inline-block
+		margin 0
+		width 40px
+		height 20px
+		background #dcdfe6
+		border 1px solid #dcdfe6
+		outline none
+		border-radius 10px
+		transition inherit
+
+		> *
+			position absolute
+			top 1px
+			left 1px
+			border-radius 100%
+			transition transform 0.3s
+			width 16px
+			height 16px
+			background-color #fff
+
+	> .label
+		margin-left 8px
+		display block
+		font-size 14px
+		cursor pointer
+		transition inherit
+
+		> span
+			line-height 20px
+			color #4a535a
+			transition inherit
+
+		> p
+			margin 0
+			color #9daab3
+
+</style>
diff --git a/src/web/app/desktop/views/components/dialog.vue b/src/web/app/desktop/views/components/dialog.vue
index 28f22f7b6..e89e8654e 100644
--- a/src/web/app/desktop/views/components/dialog.vue
+++ b/src/web/app/desktop/views/components/dialog.vue
@@ -16,21 +16,28 @@ import Vue from 'vue';
 import * as anime from 'animejs';
 
 export default Vue.extend({
-	props: ['title', 'text', 'buttons', 'modal']/*{
+	props: {
 		title: {
-			type: String
+			type: String,
+			required: false
 		},
 		text: {
-			type: String
+			type: String,
+			required: true
 		},
 		buttons: {
-			type: Array
+			type: Array,
+			default: () => {
+				return [{
+					text: 'OK'
+				}];
+			}
 		},
 		modal: {
 			type: Boolean,
 			default: false
 		}
-	}*/,
+	},
 	mounted() {
 		this.$nextTick(() => {
 			(this.$refs.bg as any).style.pointerEvents = 'auto';
diff --git a/src/web/app/desktop/views/components/settings.profile.vue b/src/web/app/desktop/views/components/settings.profile.vue
index 218da67e8..b57ac1028 100644
--- a/src/web/app/desktop/views/components/settings.profile.vue
+++ b/src/web/app/desktop/views/components/settings.profile.vue
@@ -24,7 +24,7 @@
 	<button class="ui primary" @click="save">%i18n:desktop.tags.mk-profile-setting.save%</button>
 	<section>
 		<h2>その他</h2>
-		<el-switch v-model="os.i.is_bot" @change="onChangeIsBot" active-text="このアカウントはbotです"/>
+		<mk-switch v-model="os.i.is_bot" @change="onChangeIsBot" text="このアカウントはbotです"/>
 	</section>
 </div>
 </template>
diff --git a/src/web/app/desktop/views/components/settings.vue b/src/web/app/desktop/views/components/settings.vue
index b65623e33..4a9db5f48 100644
--- a/src/web/app/desktop/views/components/settings.vue
+++ b/src/web/app/desktop/views/components/settings.vue
@@ -20,10 +20,18 @@
 
 		<section class="web" v-show="page == 'web'">
 			<h1>デザイン</h1>
-			<div>
+			<div class="div">
 				<button class="ui button" @click="customizeHome">ホームをカスタマイズ</button>
 			</div>
-			<el-switch v-model="showPostFormOnTopOfTl" @change="onChangeShowPostFormOnTopOfTl" active-text="タイムライン上部に投稿フォームを表示する"/>
+			<mk-switch v-model="showPostFormOnTopOfTl" @change="onChangeShowPostFormOnTopOfTl" text="タイムライン上部に投稿フォームを表示する"/>
+		</section>
+
+		<section class="web" v-show="page == 'web'">
+			<h1>キャッシュ</h1>
+			<button class="ui button" @click="clean">クリーンアップ</button>
+			<div class="none ui info">
+				<p>%fa:info-circle%クリーンアップを行うと、ブラウザに記憶されたアカウント情報のキャッシュ、書きかけの投稿・返信・メッセージ、およびその他のデータ(設定情報含む)が削除されます。クリーンアップを行った後はページを再度読み込みする必要があります。</p>
+			</div>
 		</section>
 
 		<section class="drive" v-show="page == 'drive'">
@@ -66,6 +74,28 @@
 			<x-api/>
 		</section>
 
+		<section class="other" v-show="page == 'other'">
+			<h1>Misskey Update</h1>
+			<p>
+				<span>バージョン: <i>{{ version }}</i></span>
+				<template v-if="latestVersion !== undefined">
+					<br>
+					<span>最新のバージョン: <i>{{ latestVersion ? latestVersion : version }}</i></span>
+				</template>
+			</p>
+			<button class="ui button" @click="checkForUpdate" :disabled="checkingForUpdate">
+				<template v-if="checkingForUpdate">アップデートを確認中<mk-ellipsis/></template>
+				<template v-else>アップデートを確認</template>
+			</button>
+		</section>
+
+		<section class="other" v-show="page == 'other'">
+			<h1>高度な設定</h1>
+			<mk-switch v-model="debug" text="デバッグモードを有効にする">
+				<span>この設定はアカウントに保存されません。</span>
+			</mk-switch>
+		</section>
+
 		<section class="other" v-show="page == 'other'">
 			<h1>%i18n:desktop.tags.mk-settings.license%</h1>
 			<div v-html="license"></div>
@@ -82,7 +112,8 @@ import XMute from './settings.mute.vue';
 import XPassword from './settings.password.vue';
 import X2fa from './settings.2fa.vue';
 import XApi from './settings.api.vue';
-import { docsUrl, license, lang } from '../../../config';
+import { docsUrl, license, lang, version } from '../../../config';
+import checkForUpdate from '../../../common/scripts/check-for-update';
 
 export default Vue.extend({
 	components: {
@@ -96,9 +127,18 @@ export default Vue.extend({
 		return {
 			page: 'profile',
 			license,
-			showPostFormOnTopOfTl: false
+			version,
+			latestVersion: undefined,
+			checkingForUpdate: false,
+			showPostFormOnTopOfTl: false,
+			debug: localStorage.getItem('debug') == 'true'
 		};
 	},
+	watch: {
+		debug() {
+			localStorage.setItem('debug', this.debug ? 'true' : 'false');
+		}
+	},
 	computed: {
 		licenseUrl(): string {
 			return `${docsUrl}/${lang}/license`;
@@ -117,6 +157,31 @@ export default Vue.extend({
 				name: 'showPostFormOnTopOfTl',
 				value: this.showPostFormOnTopOfTl
 			});
+		},
+		checkForUpdate() {
+			this.checkingForUpdate = true;
+			checkForUpdate((this as any).os, true, true).then(newer => {
+				this.checkingForUpdate = false;
+				this.latestVersion = newer;
+				if (newer == null) {
+					(this as any).apis.dialog({
+						title: '利用可能な更新はありません',
+						text: 'お使いのMisskeyは最新です。'
+					});
+				} else {
+					(this as any).apis.dialog({
+						title: '新しいバージョンが利用可能です',
+						text: 'ページを再度読み込みすると更新が適用されます。'
+					});
+				}
+			});
+		},
+		clean() {
+			localStorage.clear();
+			(this as any).apis.dialog({
+				title: 'キャッシュを削除しました',
+				text: 'ページを再度読み込みしてください。'
+			});
 		}
 	}
 });
@@ -184,7 +249,7 @@ export default Vue.extend({
 						border-bottom solid 1px #eee
 
 		> .web
-			> div
+			> .div
 				border-bottom solid 1px #eee
 				padding 0 0 16px 0
 				margin 0 0 16px 0