diff --git a/tests/test_ci_universal_release_settings.sh b/tests/test_ci_universal_release_settings.sh
new file mode 100644
index 00000000..3ab48ab9
--- /dev/null
+++ b/tests/test_ci_universal_release_settings.sh
@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+# Regression test for universal GhosttyKit and Release build settings.
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+
+for file in \
+  "$ROOT_DIR/.github/workflows/build-ghosttykit.yml" \
+  "$ROOT_DIR/scripts/setup.sh" \
+  "$ROOT_DIR/scripts/build-sign-upload.sh"
+do
+  if ! grep -Fq -- '-Dxcframework-target=universal' "$file"; then
+    echo "FAIL: $file must build GhosttyKit with -Dxcframework-target=universal"
+    exit 1
+  fi
+done
+
+if ! awk '
+  /\/\* Release \*\// { in_release=1; saw_only_active_arch=0; next }
+  in_release && /name = / { in_release=0 }
+  in_release && /ONLY_ACTIVE_ARCH = YES;/ { saw_yes=1 }
+  in_release && /ONLY_ACTIVE_ARCH = NO;/ { saw_only_active_arch=1 }
+  END { exit !(saw_only_active_arch && !saw_yes) }
+' "$ROOT_DIR/GhosttyTabs.xcodeproj/project.pbxproj"; then
+  echo "FAIL: Release configurations in project.pbxproj must use ONLY_ACTIVE_ARCH = NO"
+  exit 1
+fi
+
+echo "PASS: GhosttyKit builds universal and Release configs disable ONLY_ACTIVE_ARCH"