diff --git a/hosts/desktop/default.nix b/hosts/desktop/default.nix
index 953ab94..822c50a 100644
--- a/hosts/desktop/default.nix
+++ b/hosts/desktop/default.nix
@@ -137,6 +137,7 @@
     obs-studio
     discord
     vesktop
+    (callPackage ../../pkgs/tiddl.nix { })
   ];
 
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
diff --git a/pkgs/tiddl.nix b/pkgs/tiddl.nix
new file mode 100644
index 0000000..8f80f42
--- /dev/null
+++ b/pkgs/tiddl.nix
@@ -0,0 +1,50 @@
+# ABOUTME: tiddl, a CLI downloader for Tidal up to HiRes FLAC (24-bit/192 kHz).
+# ABOUTME: Not in nixpkgs; pinned to the branch of upstream PR #427.
+
+{ lib
+, python3Packages
+, fetchFromGitHub
+, ffmpeg
+}:
+
+python3Packages.buildPythonApplication {
+  pname = "tiddl";
+  version = "3.4.4-unstable-pr427";
+  pyproject = true;
+
+  # Release 3.4.4 asks Tidal for playback with a single client profile, which
+  # hands back the Dolby Atmos stream for any track that has one, and the
+  # default Atmos filter then skips it: whole albums download nothing, and MAX
+  # never arrives. PR #427 (oskvr37/tiddl) requests stereo through a Hi-Res
+  # profile instead, from the same login. Back to a release tag once it is
+  # merged.
+  src = fetchFromGitHub {
+    owner = "ssupt";
+    repo = "tiddl";
+    rev = "a7739f736b9b46f06e33e7b8a4eb350ec840050a"; # feat/single-auth-capability-sessions
+    hash = "sha256-1wUxVaDv6PH2IZ3W6aezjswI1CosTqmx2xmiUdPKKP0=";
+  };
+
+  build-system = with python3Packages; [ setuptools wheel ];
+
+  dependencies = with python3Packages; [
+    aiofiles
+    aiohttp
+    m3u8
+    mutagen
+    pydantic
+    requests
+    requests-cache
+    typer
+  ];
+
+  # HiRes arrives as DASH segments; tiddl calls ffmpeg to extract the FLAC.
+  makeWrapperArgs = [ "--prefix PATH : ${lib.makeBinPath [ ffmpeg ]}" ];
+
+  meta = {
+    description = "Download Tidal tracks up to HiRes FLAC";
+    homepage = "https://github.com/oskvr37/tiddl";
+    license = lib.licenses.asl20;
+    mainProgram = "tiddl";
+  };
+}