diff --git a/app.py b/app.py
new file mode 100644
index 0000000..e699b30
--- /dev/null
+++ b/app.py
@@ -0,0 +1,22 @@
+import interface
+import os
+import sys
+
+def createApp(envivorment=None, start_response=None):
+
+    # check files & environment
+    signal = os.environ.get("SIGNAL_CLI_BIN")
+    if not os.environ.get("SIGNAL_API_PASS"):
+        print("SIGNAL_API_PASS must be set in enviromenment", file=sys.stderr)
+        sys.exit(1)
+    elif not os.path.isfile(interface.SIGNAL_USER_FILE):
+        print("{} does not exist.".format(interface.SIGNAL_USER_FILE), file=sys.stderr)
+        sys.exit(1)
+    elif not os.path.getsize(interface.SIGNAL_USER_FILE) > 0:
+        print("{} is empty.".format(interface.SIGNAL_USER_FILE), file=sys.stderr)
+        sys.exit(1)
+    elif not signal or not os.path.isfile(signal):
+        print("SIGNAL_CLI_BIN not set or does not exist.", file=sys.stderr)
+        sys.exit(1)
+
+    return interface.app