diff --git a/app/package.json b/app/package.json
index 745a2e14..42a193c3 100644
--- a/app/package.json
+++ b/app/package.json
@@ -13,7 +13,8 @@
     "build:js": "node build.js",
     "build": "node view/make/make.js --automatic && npx electron-builder",
     "build:all": "npx electron-builder --win --linux",
-    "build:win": "npx electron-builder --win"
+    "build:win": "npx electron-builder --win",
+    "build:pwa": "node view/make/make.js --automatic --pwa"
   },
   "keywords": [
     "mastodon",
diff --git a/app/view/make/index.sample.html b/app/view/make/index.sample.html
index c6b0c914..d624b3e4 100644
--- a/app/view/make/index.sample.html
+++ b/app/view/make/index.sample.html
@@ -24,6 +24,7 @@
 </head>
 
 <body>
+	@@pwa@@
 	<script>
 		var ver = "@@versionLetter@@";
 		var gitHash = "@@gitHash@@"
diff --git a/app/view/make/make.js b/app/view/make/make.js
index 23fef950..528ff04e 100644
--- a/app/view/make/make.js
+++ b/app/view/make/make.js
@@ -5,9 +5,13 @@ if (process.argv.indexOf('--automatic') === -1) {
 		ver = input
 	}
 }
+var pwa = false
+if (process.argv.indexOf('--pwa') === -1) {
+	pwa = true
+}
 const path = require('path')
 const basefile = path.join(__dirname, '../../')
-function main(ver, basefile) {
+function main(ver, basefile, pwa) {
 	const fs = require('fs')
 	const execSync = require('child_process').execSync
 	let gitHash = execSync('git rev-parse HEAD')
@@ -134,11 +138,16 @@ function main(ver, basefile) {
 			source = source.replace(/@@gitHashShort@@/g, gitHash.slice(0, 7))
 			source = source.replace(/@@lang@@/g, lang)
 			source = source.replace(/@@langlist@@/g, langstr)
+			if(pwa) {
+				source = source.replace(/@@pwa@@/g, '<script>var pwa = true</script>')
+			} else {
+				source = source.replace(/@@pwa@@/g, '<script>var pwa = false</script>')
+			}
 			fs.writeFileSync(basefile + 'view/' + lang + '/' + pages[i], source)
 		}
 	}
 }
-main(ver, basefile)
+main(ver, basefile, pwa)
 
 //if --watch, to yarn dev
 if (process.argv.indexOf('--watch') !== -1) {
diff --git a/index.html b/index.html
new file mode 100644
index 00000000..8b6612c0
--- /dev/null
+++ b/index.html
@@ -0,0 +1,6 @@
+<!doctype html>
+<html>
+    <head>
+        <meta http-equiv=”refresh” content=”0;URL=’./view/ja'” />
+    </head>
+</html>
\ No newline at end of file
