diff --git a/2018/other/plot.py b/2018/other/plot.py
new file mode 100755
index 0000000..f5080c9
--- /dev/null
+++ b/2018/other/plot.py
@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+'''
+Plotter for the length of my solutions, by day.
+
+This excludes common code.
+'''
+import argparse
+import csv
+import io
+import re
+import subprocess
+import matplotlib.pyplot as plt
+import numpy as np
+
+
+def get_args():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('source', help='Source directory', nargs='?',
+                        default='src')
+    parser.add_argument('-o', '--output', help='Output for the plot')
+
+    return parser.parse_args()
+
+
+def cloc_usage(src_dir):
+    result = subprocess.run(['cloc', '--by-file', '--csv', '--quiet', src_dir],
+                            check=True, capture_output=True)
+
+    output = result.stdout.decode('utf-8')
+    data = io.StringIO(output, newline='')
+
+    reader = csv.reader(data, dialect='unix')
+    days = []
+    values = []
+
+    for line in reader:
+        if not line:
+            continue
+
+        match = re.search(r"\d+", line[1])
+        if match:
+            day = int(match.group(0))
+            days.append(day)
+            values.append(list(int(x) for x in line[2:]))
+
+    data = list(zip(days, values))
+    data.sort()
+
+    days, values = list(zip(*data))
+    values = np.array(values)
+
+    return days, values
+
+
+def main():
+    args = get_args()
+    days, values = cloc_usage(args.source)
+
+    for sequence in values.transpose():
+        plt.plot(days, sequence)
+
+    plt.xlabel('Day')
+    plt.ylabel('Lines of code')
+    plt.legend(['Blank', 'Comment', 'Code'])
+
+    if args.output:
+        plt.savefig(args.output)
+    else:
+        plt.show()
+
+
+if __name__ == '__main__':
+    main()