diff --git a/packages/app/scripts/dev.sh b/packages/app/scripts/dev.sh
index 284116db..6f9e0922 100755
--- a/packages/app/scripts/dev.sh
+++ b/packages/app/scripts/dev.sh
@@ -31,8 +31,8 @@ else
   sleep 0.3
 fi
 
-# Start Vite dev server in background
-"$BIN/vite" --host &
+# Start Vite dev server in background (host binding controlled by vite.config.ts / VITE_HOST)
+"$BIN/vite" &
 
 # Wait for all background jobs (compatible with bash 3.2 on macOS)
 wait
diff --git a/packages/app/vite.config.ts b/packages/app/vite.config.ts
index 2e127a27..d4ccb16c 100644
--- a/packages/app/vite.config.ts
+++ b/packages/app/vite.config.ts
@@ -131,7 +131,7 @@ export default defineConfig({
   },
   server: {
     port: 5173,
-    host: true,
+    host: process.env.VITE_HOST || 'localhost',
     open: false,
     proxy: {
       '/api/claude': {