diff --git a/pkgs/by-name/ad/addwater/package.nix b/pkgs/by-name/ad/addwater/package.nix
new file mode 100644
index 000000000000..90e6173d5e58
--- /dev/null
+++ b/pkgs/by-name/ad/addwater/package.nix
@@ -0,0 +1,56 @@
+{
+  blueprint-compiler,
+  desktop-file-utils,
+  fetchFromGitHub,
+  lib,
+  libadwaita,
+  libportal-gtk4,
+  meson,
+  ninja,
+  python3Packages,
+  wrapGAppsHook4,
+  appstream,
+}:
+
+python3Packages.buildPythonApplication rec {
+  pname = "addwater";
+  version = "1.1.6";
+  # built with meson, not a python format
+  pyproject = false;
+
+  src = fetchFromGitHub {
+    owner = "largestgithubuseronearth";
+    repo = "addwater";
+    rev = "refs/tags/v${version}";
+    hash = "sha256-5iuSRA18TWj6naw5MraGZ1Y9OUWEVg2oKqQtkC8rMWw=";
+  };
+
+  buildInputs = [
+    libadwaita
+    libportal-gtk4
+  ];
+
+  nativeBuildInputs = [
+    blueprint-compiler
+    desktop-file-utils
+    meson
+    ninja
+    wrapGAppsHook4
+    appstream
+  ];
+
+  propagatedBuildInputs = with python3Packages; [
+    packaging
+    pygobject3
+    requests
+  ];
+
+  meta = {
+    description = "Installer for the fantastic GNOME for Firefox theme";
+    homepage = "https://github.com/largestgithubuseronearth/addwater";
+    license = lib.licenses.gpl3Plus;
+    maintainers = with lib.maintainers; [ thtrf ];
+    mainProgram = "addwater";
+    platforms = lib.platforms.linux;
+  };
+}