VNStat is a supplement to VNDB. Unless otherwise specified all of the data displayed is either, sourced from or generated using information gathered from VNDB's API.
The primary aim of VNStat is to provide added value to the wealth of information already collected by VNDB and its contributors. As such care has been taken to avoid duplicating information, the exception being where such information is required for contextual reasons.
Data provided by VNDB and subsequent derivative products are licensed under the Open Database License and as such may be further used in accordance with said license.
Google Analytics is enabled on VNStat, you are can opt-out from this if you are concerned about your privacy by using an AdBlocker with an anti-tracking list.
User profiles are updated once per day from the database dump, only public accounts are listed. If you wish for your VNDB account not to appear on VNStat, please set it to private on your "My Account" page by selecting "Don't allow other people to see my visual novel list...".