diff --git a/scripts/report_downstream_test_diffs.py b/scripts/report_downstream_test_diffs.py
new file mode 100644
index 000000000..8750ae9c1
--- /dev/null
+++ b/scripts/report_downstream_test_diffs.py
@@ -0,0 +1,104 @@
+import argparse
+import json
+import os
+import re
+import subprocess
+import typing
+from collections import namedtuple
+
+from playwright.path_utils import get_file_dirname
+
+_dirname = get_file_dirname()
+
+TestCase = namedtuple("TestCase", ["api", "file", "test"])
+
+
+def pytest_test_cases() -> typing.Generator[TestCase, None, None]:
+    p = subprocess.run(
+        ["pytest", "--browser", "chromium", "--collect-only", "-q"],
+        cwd=_dirname / ".." / "tests",
+        stdout=subprocess.PIPE,
+        check=True,
+    )
+    regex = (
+        r"tests/(?P<api>a?sync)/test_(?P<file>.*)\.py::test_(?P<test>.*)\[chromium\]"
+    )
+    matches = re.finditer(regex, p.stdout.decode(), re.MULTILINE)
+    for match in matches:
+        yield TestCase(
+            match.group("api"), match.group("file"), match.group("test"),
+        )
+
+
+def jest_test_cases(playwright_js_path: str) -> typing.Generator[TestCase, None, None]:
+    p = subprocess.run(
+        [
+            "node",
+            os.path.join("test", "runner"),
+            "test",
+            "--trial-run",
+            "--reporter",
+            "json",
+        ],
+        cwd=playwright_js_path,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.DEVNULL,
+        check=True,
+    )
+
+    tests = json.loads(p.stdout.decode())
+    for test in [*tests["pending"], *tests["passes"], *tests["failures"]]:
+        regex = r"(.*/)?(?P<file>[^/]+)\.spec\.[jt]s$"
+
+        match = re.match(regex, test["file"])
+        if not match:
+            continue
+
+        file = match.group("file")
+
+        yield TestCase("sync", normalized(file), normalized(test["title"]))
+        yield TestCase("async", normalized(file), normalized(test["title"]))
+
+
+def normalized(original: str) -> str:
+    cleaned = re.sub(r"[^a-z0-9_]", "_", original, flags=re.IGNORECASE)
+    cleaned = re.sub(r"[_]+", "_", cleaned)
+    cleaned = cleaned.strip("_")
+    return cleaned
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "--playwright-js-path",
+        type=str,
+        help="path to playwright JavaScript directory",
+        required=True,
+    )
+    parser.add_argument(
+        "--api",
+        type=str,
+        help="filter test cases based on API",
+        choices=["sync", "async"],
+    )
+    args = parser.parse_args()
+
+    python_tests = set(pytest_test_cases())
+    javascript_tests = set(jest_test_cases(args.playwright_js_path))
+
+    if args.api:
+        javascript_tests = set([x for x in javascript_tests if x.api == args.api])
+
+    missing = javascript_tests.difference(python_tests)
+    found = javascript_tests.intersection(python_tests)
+
+    print("MISSING, MISPELLED, OR MISNAMED:")
+    print("=" * 80)
+    for (api, file, test) in sorted(missing):
+        print(f"{api}/test_{file}.py::test_{test}")
+
+    print(f"\nMissing: {len(missing)}, Found: {len(found)}")
+
+
+if __name__ == "__main__":
+    main()