diff --git a/pkgs/launch-webapp/default.nix b/pkgs/launch-webapp/default.nix
new file mode 100644
index 0000000..c2ec236
--- /dev/null
+++ b/pkgs/launch-webapp/default.nix
@@ -0,0 +1,41 @@
+{
+  lib,
+  stdenv,
+  writeShellScriptBin,
+}: let
+  launcher = writeShellScriptBin "launch-webapp" ''
+    #!/usr/bin/env bash
+
+    browser=$(xdg-settings get default-web-browser)
+
+    case "$browser" in
+      google-chrome*) browser_bin="google-chrome" ;;
+      brave-browser*) browser_bin="brave-browser" ;;
+      microsoft-edge*) browser_bin="microsoft-edge" ;;
+      opera*) browser_bin="opera" ;;
+      vivaldi*) browser_bin="vivaldi" ;;
+      *) browser_bin="chromium" ;;
+    esac
+
+    exec_cmd="/etc/profiles/per-user/$USER/bin/$browser_bin"
+    exec setsid uwsm app -- "$exec_cmd" --app="$1" ''${@:2}
+  '';
+in
+  stdenv.mkDerivation {
+    pname = "launch-webapp";
+    version = "0.1.0";
+
+    dontUnpack = true;
+
+    installPhase = ''
+      mkdir -p $out/bin
+      ln -s ${launcher}/bin/launch-webapp $out/bin/launch-webapp
+    '';
+
+    meta = with lib; {
+      description = "Launches a web app using your default browser in app mode.";
+      license = licenses.mit;
+      platforms = platforms.linux;
+      maintainers = [];
+    };
+  }