this post was submitted on 28 Jan 2026
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The minority of Vivaldi is closed source from what I have read actually - specifically the stuff they have that makes its fancy UI work, but someone can correct me with a citation if that is not true.
They state that about 95% of it is available to be read where 92% of that is open source from Chromium, 3% is open source from Vivaldi themselves, and the last 5% that is not available to be read is Vivaldi's UI.
https://vivaldi.com/blog/technology/why-isnt-vivaldi-browser-open-source/
Still far from open source or free software, but better than most people would think. I guess you would also have to trust them that it really is just the UI.
Exactly. Yes, I know they claim it's just the UI, and the sole purpose of closed-source code is to make it harder to steal innovative UI elements - but when it comes to something as sensitive as the browser, I'd like for these claims to be verifiable.