diff --git a/flake.nix b/flake.nix
index c8631b4..386c3a1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -59,9 +59,12 @@
         ./modules/btop.nix
         ./modules/firefox.nix
         ./modules/ghostty.nix
+        ./modules/syncthing.nix
         ./config/fonts.nix
       ];
 
+      nixpkgs.config.allowUnfree = true;
+
       home.username = "yanlin";
       home.homeDirectory = "/Users/yanlin";
       home.stateVersion = "24.05";
@@ -85,6 +88,10 @@
         zoxide
         delta
         maccy
+        appcleaner
+        iina
+        keepassxc
+        syncthing
       ];
 
       programs.home-manager.enable = true;
diff --git a/modules/syncthing.nix b/modules/syncthing.nix
new file mode 100644
index 0000000..4436fa8
--- /dev/null
+++ b/modules/syncthing.nix
@@ -0,0 +1,29 @@
+{ config, pkgs, lib, ... }:
+
+{
+  # Enable Syncthing service
+  services.syncthing = {
+    enable = true;
+    # Don't enable tray on macOS as it requires additional setup
+    tray.enable = false;
+  };
+  
+  # Copy existing Syncthing configuration to preserve device ID and settings
+  home.activation.syncthingConfig = lib.hm.dag.entryAfter ["writeBoundary"] ''
+    # Create syncthing config directory if it doesn't exist
+    mkdir -p "$HOME/.config/syncthing"
+    
+    # Copy configuration from macOS location if not already present
+    if [ ! -e "$HOME/.config/syncthing/config.xml" ]; then
+      echo "Migrating Syncthing configuration from macOS location..."
+      if [ -d "$HOME/Library/Application Support/Syncthing" ]; then
+        cp -r "$HOME/Library/Application Support/Syncthing/"* "$HOME/.config/syncthing/"
+        echo "Syncthing configuration migrated successfully!"
+      else
+        echo "Warning: No existing Syncthing configuration found to migrate"
+      fi
+    else
+      echo "Syncthing configuration already exists at ~/.config/syncthing"
+    fi
+  '';
+}
\ No newline at end of file