diff --git a/atst/ui_methods.py b/atst/ui_methods.py
index d5c5bf78..e335b941 100644
--- a/atst/ui_methods.py
+++ b/atst/ui_methods.py
@@ -1,2 +1,7 @@
+import os
+
+def dev(self):
+    return os.getenv("TORNADO_ENV", "dev") == "dev"
+
 def matchesPath(self, href):
     return self.request.uri.startswith(href)