diff --git a/frontend/src/routes/study/write/[id]/+page.svelte b/frontend/src/routes/study/write/[id]/+page.svelte
index bc5934c..40538fd 100644
--- a/frontend/src/routes/study/write/[id]/+page.svelte
+++ b/frontend/src/routes/study/write/[id]/+page.svelte
@@ -192,6 +192,7 @@
         {sess.study_type === 'language' ? `${sess.language_code || '?'} · ${sess.learning_level || ''}` : (sess.certification || '자격증')}
         · {sess.subject || ''} · {sess.topic || ''}
       {/if}
+      <span class="ml-2 text-[10px] text-dim/60">build {__BUILD_TIME__}</span>
     </div>
 
     <button
diff --git a/frontend/vite.config.js b/frontend/vite.config.js
index 2c01dec..019c0a1 100644
--- a/frontend/vite.config.js
+++ b/frontend/vite.config.js
@@ -4,4 +4,9 @@ import { defineConfig } from 'vite';
 
 export default defineConfig({
   plugins: [tailwindcss(), sveltekit()],
+  // 빌드 시점 timestamp 를 코드에 inject — 페이지에 작게 노출해서 사용자가
+  // 옛 캐시를 보고 있는지 쉽게 확인 가능. 새 빌드마다 값 변경.
+  define: {
+    __BUILD_TIME__: JSON.stringify(new Date().toISOString().slice(0, 16).replace('T', ' ')),
+  },
 });