I have been messing around with the Brave browser (https://www.brave.com/), an I cannot figure out how to determine how if a user is using Brave. I used a simp
Brave doesn’t have its own User-Agent, as pointed out in other answers. However, you can quite easily fingerprint it to differentiate it from Google Chrome. The current release, version 0.23.19, has at least 40 unique characteristics that can tell it apart from other browsers. I go into more detail on that in this article. However, this is a riddiculous sulution. Please just ask Brave to restore their own User-Agent string.