[ndriver]

Just for fun, I proceeded with the test of trying to implement a solution to keep an eye on and plot my reading patterns.

This is self hosted. The e-reader sends the result of a query to my PC, where it is parsed.
(A shared site would not be something I would use because of the privacy issues that are inherent to that type of setup.)

I can then lookup and search the results in a web page (though at the moment it is in need of a bit of styling...). After selecting the date range, a stacked bar chart is displayed, showing what and how much was read on a daily, weekly or monthly scale.

Main drawbacks are that ideally the script which sends the query result to the PC should be run everyday the Kobo is used and secondly the results are only valid in scenarios where you use exclusively one device, since this data is not synced to the Kobo servers as davidfor warned on the previous post.