diff --git a/.gitignore b/.gitignore
index b2583b0f1..6f79a4598 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,7 @@ npm-debug.log
 /play.pokemonshowdown.com/audio/
 /play.pokemonshowdown.com/index.php
 /play.pokemonshowdown.com/index.html
+/play.pokemonshowdown.com/index-test.html
 /play.pokemonshowdown.com/preactalpha.html
 /play.pokemonshowdown.com/crossprotocol.html
 /play.pokemonshowdown.com/data/
diff --git a/build-tools/swap-configs b/build-tools/swap-configs
new file mode 100755
index 000000000..51eb34579
--- /dev/null
+++ b/build-tools/swap-configs
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+cd "$(dirname "$0")"
+cd ..
+cp config/config.js config/config.js.old
+cp config/head-custom.html config/head-custom.html.old
+mv -f config/config-test.js config/config.js
+mv -f config/head-custom-test.html config/head-custom.html
+mv -i config/config.js.old config/config-test.js
+mv -i config/head-custom.html.old config/head-custom-test.html
diff --git a/build-tools/update b/build-tools/update
index 7d19fa6ef..4d99acd89 100755
--- a/build-tools/update
+++ b/build-tools/update
@@ -197,11 +197,18 @@ try {
 indexContents = indexContents.replace(/<!-- newsid -->/g, newsid);
 indexContents = indexContents.replace(/<!-- news -->/g, news);
 
+let indexContents2 = '';
 try {
+	let indexContentsOld = indexContents;
 	indexContents = indexContents.replace(/<!-- head custom -->/g, '' + fs.readFileSync('config/head-custom.html'));
+	indexContents2 = indexContentsOld.replace(/<!-- head custom -->/g, '' + fs.readFileSync('config/head-custom-test.html'));
+	indexContents2 = indexContents2.replace(/src="\/\/play.pokemonshowdown.com\/config\/config.js\?[a-z0-9]*"/, 'src="//play.pokemonshowdown.com/config/config-test.js?3"');
 } catch (e) {}
 
 fs.writeFileSync('play.pokemonshowdown.com/index.html', indexContents);
+if (indexContents2) {
+	fs.writeFileSync('play.pokemonshowdown.com/index-test.html', indexContents2);
+}
 fs.writeFileSync('play.pokemonshowdown.com/preactalpha.html', preactIndexContents);
 fs.writeFileSync('play.pokemonshowdown.com/crossprotocol.html', crossprotocolContents);
 fs.writeFileSync('play.pokemonshowdown.com/js/replay-embed.js', replayEmbedContents);
diff --git a/play.pokemonshowdown.com/config/config-test.js b/play.pokemonshowdown.com/config/config-test.js
new file mode 120000
index 000000000..fbd23bfd4
--- /dev/null
+++ b/play.pokemonshowdown.com/config/config-test.js
@@ -0,0 +1 @@
+../../config/config-test.js
\ No newline at end of file