2. Gmail Meter
This little gem of an add-on allows users to know virtually everything about their Gmail usage statistics. Meter gathers information that details how many emails were sent, received, starred and replied to. There is also a chart that shows daily activity, and it can help identify drops and spurts in email activity. Meter also has easy-to-read graphs that show how much mail is stored, archived, labeled or deleted.
Other helpful features allow the user to identify threads, email length, word count and see who on the user’s email list is communicated with the most. Some users have jokingly asked for a feature that would allow them to find a way to get less email in the first place.