diff --git a/modules/applications/by-name/cosmic-ext-tweaks/default.nix b/modules/applications/by-name/cosmic-ext-tweaks/default.nix
new file mode 100644
index 0000000..8c1cedb
--- /dev/null
+++ b/modules/applications/by-name/cosmic-ext-tweaks/default.nix
@@ -0,0 +1,24 @@
+{ lib, ... }:
+lib.cosmic.applications.mkCosmicApplication {
+  name = "cosmic-ext-tweaks";
+  originalName = "COSMIC Calculator";
+  identifier = "dev.edfloreshz.CosmicTweaks";
+  configurationVersion = 1;
+
+  maintainers = [ lib.maintainers.HeitorAugustoLN ];
+
+  settingsOptions.app_theme =
+    lib.cosmic.defaultNullOpts.mkRonEnum [ "Dark" "Light" "System" ]
+      {
+        __type = "enum";
+        variant = "System";
+      }
+      ''
+        The theme of the application.
+      '';
+
+  settingsExample.app_theme = {
+    __type = "enum";
+    variant = "System";
+  };
+}