I wasn't sure myself so I checked wikipedia pages and for both brave and opera it says they are using chromium as base: https://en.wikipedia.org/wiki/Opera_(web

I wasn't sure myself so I checked wikipedia pages and for both brave and opera it says they are using chromium as base: https://en.wikipedia.org/wiki/Opera_(web_browser) https://en.wikipedia.org/wiki/Opera_(web_browser) https://en.wikipedia.org/wiki/Brave_(web_browser) https://en.wikipedia.org/wiki/Brave_(web_browser) I know that wikipedia might not be the most reliable source of information.