diff --git a/VideoDownloader.App/Core/DownloadManager.cs b/VideoDownloader.App/Core/DownloadManager.cs
index 8ccf3f3..e117090 100644
--- a/VideoDownloader.App/Core/DownloadManager.cs
+++ b/VideoDownloader.App/Core/DownloadManager.cs
@@ -3,7 +3,7 @@ using System.Net;
 using System.Net.Http;
 using System.Windows.Data;
 using Microsoft.Web.WebView2.Core;
-using VideoDownloader.App.Detection;
+using VideoDownloader.Core.Detection;
 using VideoDownloader.App.ViewModels;
 using VideoDownloader.Core.Config;
 using VideoDownloader.Core.Dash;
diff --git a/VideoDownloader.App/MainWindow.xaml.cs b/VideoDownloader.App/MainWindow.xaml.cs
index a8e26a4..2c0c9bf 100644
--- a/VideoDownloader.App/MainWindow.xaml.cs
+++ b/VideoDownloader.App/MainWindow.xaml.cs
@@ -12,7 +12,7 @@ using Microsoft.Web.WebView2.Core;
 using VideoDownloader.App.Browser;
 using VideoDownloader.App.Browser.Tabs;
 using VideoDownloader.App.Core;
-using VideoDownloader.App.Detection;
+using VideoDownloader.Core.Detection;
 using VideoDownloader.App.ViewModels;
 using VideoDownloader.Core.Config;
 using Wv2 = Microsoft.Web.WebView2.Wpf;
diff --git a/VideoDownloader.App/ViewModels/DownloadItemViewModel.cs b/VideoDownloader.App/ViewModels/DownloadItemViewModel.cs
index 746cfc7..e2e101c 100644
--- a/VideoDownloader.App/ViewModels/DownloadItemViewModel.cs
+++ b/VideoDownloader.App/ViewModels/DownloadItemViewModel.cs
@@ -1,7 +1,7 @@
 using System.Collections.ObjectModel;
 using System.ComponentModel;
 using System.Runtime.CompilerServices;
-using VideoDownloader.App.Detection;
+using VideoDownloader.Core.Detection;
 using VideoDownloader.Core.Social;
 
 namespace VideoDownloader.App.ViewModels;
diff --git a/VideoDownloader.App/Detection/DetectionContext.cs b/VideoDownloader.Core/Detection/DetectionContext.cs
similarity index 88%
rename from VideoDownloader.App/Detection/DetectionContext.cs
rename to VideoDownloader.Core/Detection/DetectionContext.cs
index bea8984..950d3a1 100644
--- a/VideoDownloader.App/Detection/DetectionContext.cs
+++ b/VideoDownloader.Core/Detection/DetectionContext.cs
@@ -1,4 +1,4 @@
-namespace VideoDownloader.App.Detection;
+namespace VideoDownloader.Core.Detection;
 
 public enum MediaKind { Hls, Dash, Direct, Social }
 
diff --git a/VideoDownloader.App/Detection/MediaDetector.cs b/VideoDownloader.Core/Detection/MediaDetector.cs
similarity index 99%
rename from VideoDownloader.App/Detection/MediaDetector.cs
rename to VideoDownloader.Core/Detection/MediaDetector.cs
index f17539c..8975560 100644
--- a/VideoDownloader.App/Detection/MediaDetector.cs
+++ b/VideoDownloader.Core/Detection/MediaDetector.cs
@@ -1,6 +1,6 @@
 using VideoDownloader.Core.Config;
 
-namespace VideoDownloader.App.Detection;
+namespace VideoDownloader.Core.Detection;
 
 /// <summary>요청(URL + content-type + 길이)과 설정으로 미디어 종류를 판정.</summary>
 public static class MediaDetector
diff --git a/VideoDownloader.App/Detection/SocialSiteDetector.cs b/VideoDownloader.Core/Detection/SocialSiteDetector.cs
similarity index 99%
rename from VideoDownloader.App/Detection/SocialSiteDetector.cs
rename to VideoDownloader.Core/Detection/SocialSiteDetector.cs
index e475343..55ca334 100644
--- a/VideoDownloader.App/Detection/SocialSiteDetector.cs
+++ b/VideoDownloader.Core/Detection/SocialSiteDetector.cs
@@ -1,6 +1,6 @@
 using System.Text.RegularExpressions;
 
-namespace VideoDownloader.App.Detection;
+namespace VideoDownloader.Core.Detection;
 
 /// <summary>
 /// 소셜 영상 페이지(YouTube/Shorts/Instagram/X/TikTok/Facebook) 판별 + URL 정규화.