diff --git a/src/renderer/inbox/App.tsx b/src/renderer/inbox/App.tsx
index 154d791..04f6c71 100644
--- a/src/renderer/inbox/App.tsx
+++ b/src/renderer/inbox/App.tsx
@@ -18,6 +18,9 @@ import { SearchBox } from './components/SearchBox.js';
 import { ReviewView } from './components/ReviewView.js';
 import type { InboxView } from './store.js';
 
+// QuickCapture 단축키 modifier — macOS 는 Cmd, 그 외는 Ctrl.
+const MOD_KEY = /Mac/i.test(navigator.platform) ? 'Cmd' : 'Ctrl';
+
 export function App(): React.ReactElement {
   const {
     notes, trashNotes, trashCount, showTrash,
@@ -190,7 +193,7 @@ export function App(): React.ReactElement {
             ) : searchResults !== null && displayed.length === 0 ? (
               <div className="empty">검색 결과가 없습니다.</div>
             ) : notes.length === 0 ? (
-              <div className="empty">머릿속에 떠다니는 한 줄을 적어보세요. <code>Ctrl+Shift+J</code></div>
+              <div className="empty">머릿속에 떠다니는 한 줄을 적어보세요. <code>{MOD_KEY}+Shift+J</code></div>
             ) : displayed.length === 0 ? (
               <div className="empty">이 태그의 노트가 없습니다.</div>
             ) : (
diff --git a/src/renderer/quickcapture/App.tsx b/src/renderer/quickcapture/App.tsx
index eb4d0ae..afdb702 100644
--- a/src/renderer/quickcapture/App.tsx
+++ b/src/renderer/quickcapture/App.tsx
@@ -3,6 +3,9 @@ import { captureApi } from './api.js';
 
 interface PastedImage { url: string; buffer: ArrayBuffer; }
 
+// 저장 단축키 modifier — macOS 는 Cmd, 그 외는 Ctrl.
+const MOD_KEY = /Mac/i.test(navigator.platform) ? 'Cmd' : 'Ctrl';
+
 export function App(): React.ReactElement {
   const [text, setText] = useState('');
   const [images, setImages] = useState<PastedImage[]>([]);
@@ -65,7 +68,7 @@ export function App(): React.ReactElement {
           {images.map((i, idx) => (<img key={idx} src={i.url} alt="" />))}
         </div>
       )}
-      <div className="hint">Ctrl+Enter 저장 · Esc 취소 · 이미지 붙여넣기</div>
+      <div className="hint">{MOD_KEY}+Enter 저장 · Esc 취소 · 이미지 붙여넣기</div>
       {err && <div className="err">{err}</div>}
     </div>
   );