diff --git a/compatibility-suite.py b/compatibility-suite.py
new file mode 100644
index 0000000..48df7a4
--- /dev/null
+++ b/compatibility-suite.py
@@ -0,0 +1,74 @@
+import sys
+import os
+import signal
+from selenium import webdriver
+from selenium.webdriver.common.by import By
+from selenium.webdriver.support.ui import WebDriverWait
+from selenium.common.exceptions import TimeoutException
+from selenium.webdriver.support import expected_conditions as EC
+import subprocess
+import time
+
+servirtium_process = None
+
+# Pete Hodgson's original is at https://www.todobackend.com/specs/index.html
+# Ours has a few additions to aid it's use in this compatibility suite
+# Playback and Record mode use ours. Direct mode uses Pete's original.
+todoSuiteUrl = "https://servirtium.github.io/compatibility-suite/index.html"
+
+# We used to use the Ruby Sinatra version of the Todobackend, but it is not
+# up as often as the http4k version is
+realUrl = "https://http4k-todo-backend.herokuapp.com"
+
+if len(sys.argv) > 1:
+
+   if sys.argv[1] == "record":
+       # TODO check that node process is already started.
+       url = "http://localhost:61417"
+       servirtium_process = subprocess.Popen(["node", "src/todobackend_compatibility_test.js", "record", realUrl])
+   elif sys.argv[1] == "playback":
+       url = "http://localhost:61417"
+       servirtium_process = subprocess.Popen(["node", "src/todobackend_compatibility_test.js", "playback", realUrl])
+   elif sys.argv[1] == "direct":
+       print("showing Http4k Todobackend implementation online without Servirtium in the middle")
+       todoSuiteUrl = "https://www.todobackend.com/specs/index.html"
+       url = realUrl
+   else:
+       print("Second arg should be record or playback")
+       exit(10)
+else:
+   print("record/playback/direct argument needed")
+   exit(10)
+
+if len(sys.argv) > 2:
+   if sys.argv[2] == "local":
+       # Running via 'python -m SimpleHTTPServer 8000' in a different shell
+       todoSuiteUrl = "http://localhost:8000/index.html"
+
+driver = webdriver.Chrome("chromedriver")
+
+print("sleep 5 seconds for older workstations")
+time.sleep(5)
+
+driver.get(todoSuiteUrl + "?" + url)
+try:
+    element = WebDriverWait(driver, 300).until(
+        EC.text_to_be_present_in_element((By.CLASS_NAME, "passes"), "16")
+    )
+    print("Compatibility suite: all 16 tests passed")
+
+except TimeoutException as ex:
+    print("Compatibility suite: did not finish with 16 passes. See open browser frame.")
+
+# TODO warn that node process was not started.
+
+print("mode: " + sys.argv[1])
+
+if servirtium_process is not None:
+    print("Killing servirtium process")
+    os.killpg(os.getpgid(servirtium_process.pid), signal.SIGTERM)
+    servirtium_process.kill()
+
+print("Closing Selenium")
+driver.quit()
+print("All done.")