diff --git a/src/api/endpoints/posts/create.ts b/src/api/endpoints/posts/create.ts
index 075e1ac9f0..57f98fa811 100644
--- a/src/api/endpoints/posts/create.ts
+++ b/src/api/endpoints/posts/create.ts
@@ -31,6 +31,10 @@ module.exports = (params, user: IUser, app) => new Promise(async (res, rej) => {
 	const [text, textErr] = $(params.text).optional.string().pipe(isValidText).$;
 	if (textErr) return rej('invalid text');
 
+	// Get 'via_mobile' parameter
+	const [viaMobile = false, viaMobileErr] = $(params.via_mobile).optional.boolean().$;
+	if (viaMobileErr) return rej('invalid via_mobile');
+
 	// Get 'tags' parameter
 	const [tags = [], tagsErr] = $(params.tags).optional.array('string').unique().eachQ(t => t.range(1, 32)).$;
 	if (tagsErr) return rej('invalid tags');
@@ -239,6 +243,7 @@ module.exports = (params, user: IUser, app) => new Promise(async (res, rej) => {
 		tags: tags,
 		user_id: user._id,
 		app_id: app ? app._id : null,
+		via_mobile: viaMobile,
 
 		// 以下非正規化データ
 		_reply: reply ? { user_id: reply.user_id } : undefined,
diff --git a/src/api/models/post.ts b/src/api/models/post.ts
index 0bbacebf66..edb69e0c15 100644
--- a/src/api/models/post.ts
+++ b/src/api/models/post.ts
@@ -31,6 +31,7 @@ export type IPost = {
 	app_id: mongo.ObjectID;
 	category: string;
 	is_category_verified: boolean;
+	via_mobile: boolean;
 };
 
 /**
diff --git a/src/const.json b/src/const.json
index d8fe4fe6cd..65dc734fab 100644
--- a/src/const.json
+++ b/src/const.json
@@ -1,5 +1,5 @@
 {
 	"copyright": "Copyright (c) 2014-2018 syuilo",
-	"themeColor": "#ff4e45",
+	"themeColor": "#5cbb2d",
 	"themeColorForeground": "#fff"
 }
diff --git a/src/web/app/desktop/views/components/posts.post.vue b/src/web/app/desktop/views/components/posts.post.vue
index 4a95918c48..ce0a31d183 100644
--- a/src/web/app/desktop/views/components/posts.post.vue
+++ b/src/web/app/desktop/views/components/posts.post.vue
@@ -26,6 +26,7 @@
 				<span class="username">@{{ p.user.username }}</span>
 				<div class="info">
 					<span class="app" v-if="p.app">via <b>{{ p.app.name }}</b></span>
+					<span class="mobile" v-if="p.via_mobile">%fa:mobile-alt%</span>
 					<router-link class="created-at" :to="url">
 						<mk-time :time="p.created_at"/>
 					</router-link>
@@ -399,6 +400,10 @@ export default Vue.extend({
 					margin-left auto
 					font-size 0.9em
 
+					> .mobile
+						margin-right 8px
+						color #ccc
+
 					> .app
 						margin-right 8px
 						padding-right 8px
diff --git a/src/web/app/desktop/views/components/settings.vue b/src/web/app/desktop/views/components/settings.vue
index 182a9a1d5e..20d7a77715 100644
--- a/src/web/app/desktop/views/components/settings.vue
+++ b/src/web/app/desktop/views/components/settings.vue
@@ -26,6 +26,11 @@
 			<mk-switch v-model="os.i.client_settings.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>モバイル</h1>
+			<mk-switch v-model="os.i.client_settings.disableViaMobile" @change="onChangeDisableViaMobile" text="モバイルからの投稿とフラグを付けない"/>
+		</section>
+
 		<section class="web" v-show="page == 'web'">
 			<h1>言語</h1>
 			<el-select v-model="lang" placeholder="言語を選択">
@@ -192,6 +197,12 @@ export default Vue.extend({
 				value: v
 			});
 		},
+		onChangeDisableViaMobile(v) {
+			(this as any).api('i/update_client_setting', {
+				name: 'disableViaMobile',
+				value: v
+			});
+		},
 		checkForUpdate() {
 			this.checkingForUpdate = true;
 			checkForUpdate((this as any).os, true, true).then(newer => {
diff --git a/src/web/app/mobile/views/components/post-form.vue b/src/web/app/mobile/views/components/post-form.vue
index 63b75b92f0..009012b0b6 100644
--- a/src/web/app/mobile/views/components/post-form.vue
+++ b/src/web/app/mobile/views/components/post-form.vue
@@ -91,11 +91,13 @@ export default Vue.extend({
 		},
 		post() {
 			this.posting = true;
+			const viaMobile = (this as any).os.i.client_settings.disableViaMobile !== true;
 			(this as any).api('posts/create', {
 				text: this.text == '' ? undefined : this.text,
 				media_ids: this.files.length > 0 ? this.files.map(f => f.id) : undefined,
 				reply_id: this.reply ? this.reply.id : undefined,
-				poll: this.poll ? (this.$refs.poll as any).get() : undefined
+				poll: this.poll ? (this.$refs.poll as any).get() : undefined,
+				via_mobile: viaMobile
 			}).then(data => {
 				this.$emit('post');
 				this.$destroy();
diff --git a/src/web/app/mobile/views/components/posts.post.vue b/src/web/app/mobile/views/components/posts.post.vue
index 3c02e1e990..d0a897db65 100644
--- a/src/web/app/mobile/views/components/posts.post.vue
+++ b/src/web/app/mobile/views/components/posts.post.vue
@@ -24,9 +24,12 @@
 				<router-link class="name" :to="`/${p.user.username}`">{{ p.user.name }}</router-link>
 				<span class="is-bot" v-if="p.user.is_bot">bot</span>
 				<span class="username">@{{ p.user.username }}</span>
-				<router-link class="created-at" :to="url">
-					<mk-time :time="p.created_at"/>
-				</router-link>
+				<div class="info">
+					<span class="mobile" v-if="p.via_mobile">%fa:mobile-alt%</span>
+					<router-link class="created-at" :to="url">
+						<mk-time :time="p.created_at"/>
+					</router-link>
+				</div>
 			</header>
 			<div class="body">
 				<div class="text" ref="text">
@@ -336,10 +339,16 @@ export default Vue.extend({
 					margin 0 0.5em 0 0
 					color #ccc
 
-				> .created-at
+				> .info
 					margin-left auto
 					font-size 0.9em
-					color #c0c0c0
+
+					> .mobile
+						margin-right 6px
+						color #c0c0c0
+
+					> .created-at
+						color #c0c0c0
 
 			> .body
 
diff --git a/src/web/docs/api/entities/post.yaml b/src/web/docs/api/entities/post.yaml
index 551f3b7c3e..e4359ffd0c 100644
--- a/src/web/docs/api/entities/post.yaml
+++ b/src/web/docs/api/entities/post.yaml
@@ -17,6 +17,12 @@ props:
     desc:
       ja: "投稿日時"
       en: "The posted date of this post"
+  - name: "via_mobile"
+    type: "boolean"
+    optional: true
+    desc:
+      ja: "モバイル端末から投稿したか否か(自己申告であることに留意)"
+      en: "Whether this post sent via a mobile device"
   - name: "text"
     type: "string"
     optional: true