diff --git a/qc.sh b/qc.sh
new file mode 100755
index 0000000..b73a1c7
--- /dev/null
+++ b/qc.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+set -e
+
+black lfcircle.py --check
+isort lfcircle.py --check
+mypy lfcircle.py
+ruff check lfcircle.py