Totally off-topic, but what did you use to make the charts for your productivity-per-hour, and how did you track productivity? I use a time-tracking app (Toggl)

Totally off-topic, but what did you use to make the charts for your productivity-per-hour, and how did you track productivity? I use a time-tracking app (Toggl), but it's not easy to determine the difference between an hour when I'm on fire and an hour where mt brain feels like fuzz.