People Twitter

Yeah, I really wish they wouldn't, but there are honestly not a lot of options unless they re-engineer the wheel.

Yea I'll stick to Firefox, but keep an eye out for what else they're up to

We told you already to stop flashing people, buddy.

It's not Open Source / Free Software and it's also based on Blink, like all Chromium browsers.

Not really sure about its selling points, but supporting Google's grip on web standards seems to clash with the statement of openness in this advertisement.

Used to do tech support for Vivaldi on Reddit before I left. It is a highly configurable chromium based browser that does everything it can to secure and take most of Google out of the browser. It has its own profile system and sync servers before it was enforced, blocks Ads and Tracking outside of the Manifest system, and is highly configurable with its own per profile settings, and has a user editable theming system. It's adblock system isn't uBlock level yet but it can use many of the same blocklists and blocks ads on the intake so similar to how uBlock does it now. It has a Mail, RSS, Mastodon Client, and Calendar. It has also done a codebase rewrite of the Chromium engine to optimize its performance. They literally also follow their previous commitments they made during the days of Opera where they have patents, but only to protect themselves and not to restrain others from using them. Back when they were making Opera they and the Mozilla Foundation used to send each other cake at major releases because they were both strong web standards organizations and shared patents at no charge.

And the thing is it is an Iterative release. They have about 50 people, and only 30 are devs. They have browsers on Linux, MacOS, iOS, Android, and Windows. They release more basic versions of the product and grow them then building an in depth product.

So why not go Open Source. Their size. Any company could take their large amounts of work, build on it and release it before they have time to react and it would mean an almost instant loss of control. They are pro-federation, anti crypto, E2EE Sync, and despite what the Brave Employee says on PrivacyTests.org, highly (but not purely) privacy focused browser.

Understanding that the browser is based on an Open Source Browser, and uses Web Standards, and you distribute freely, then why not just be Open Source? Many Open Source Advocates have accepted it as Open Source Adjacent and have even become a release on some less strict Open Source people. So why not? Their CEO answered this that it is basically a function of their size and the large amounts of custom code that they have had to make to the browser. If they went Open Source, which they discussed and tried to find a way they could, but any of the MUCH larger teams could just take their product whole cloth, put a minimal amount of work in and have a better browser and they would be shortly out of business.

For those who are all business is bad, remember that here is a group of people who through several companies and one under attack from Microsoft, managed to survive the original browser wars while supporting Open Source Browsers and Projects. The one bad thing you can say is that they originally planned to go up against Google and Chrome's Manifest v3, but they couldn't and couldn't find co-operation from other Chromium Based browsers once they saw the exact form Manifest v3 was going to take. Outside of that they are working to get their ad block tech up to a near uBlock version, but they won't just do to uBlock what they fear could be done to themselves if they were Open Source.

TL;DR It is a free browser that has a very friendly set up process so if you want to see the features, download it and install it. If you are on Mobile I will warn you they are still having UX/UI design issues there.

the browser itself seems to not be open source

From their wiki:

Although intended for general users, it is first and foremost targeted towards technically inclined users as well as former Opera users disgruntled by its transition from the Presto layout engine to a Chromium-based browser that resulted in the loss of many of its distinctive features. Despite the fact that it is also Chromium-based, Vivaldi aims to revive the features of the Presto-based Opera with its own proprietary modifications.

Far better UI, built-in ad blocker that does get complained about by some sites, but likely less locked down than Fennec or Mull.

Try working with the Vivaldi Speed Dial for a bit then wonder what Mitchell Baker was doing all those years.

Built-in note taking app, page capture, etc.

Good daily driver for non-secure doings just keep in mind the chromium framework framework.

Anecdotal, but I've found that it has spectacular adblock capability. uBlock Origin + the browser's native adblocking mean I never even see a specter of an advertisement, especially now that YouTube is going hog wild. Great browser, very customizable, low resource use.