diff --git a/bin/sassw b/bin/sassw
new file mode 100755
index 0000000..870bdde
--- /dev/null
+++ b/bin/sassw
@@ -0,0 +1,38 @@
+#! /usr/bin/python3
+#
+# Run sassc and watch for changes in source files (using inotitfy) to rebuild
+# automatically.
+#
+# Usage: sassw INPUT
+# (output will automatically be INPUT with .scss changed to .css)
+
+import json
+import os
+import pyinotify
+import subprocess
+import sys
+
+filename = sys.argv[1]
+
+def build():
+    global sources, directories
+    subprocess.call(['sassc', '-mauto', filename, filename.replace('.scss', '.css')])
+    sources = [os.path.abspath(x) for x in json.load(open(filename.replace('.scss', '.css.map')))['sources']]
+    directories = set([os.path.dirname(x) for x in sources])
+
+class EventManager(pyinotify.ProcessEvent):
+    def process_default(self, event):
+        if event.pathname in sources:
+            filename = os.path.basename(event.pathname)
+            print(f'{filename} changed, building', end='')
+            build()
+            print('.')
+
+build()
+wm = pyinotify.WatchManager()
+notifier = pyinotify.Notifier(wm, default_proc_fun=EventManager())
+for directory in directories:
+    wm.add_watch(directory, pyinotify.IN_CLOSE_WRITE)
+notifier.coalesce_events()
+print('>>> Sassw is watching for changes. Press Ctrl-C to stop.')
+notifier.loop()