Vivaldi is a Chromium based browser with its UI written with web technologies (HTML/JS). Vivaldi advertises itself as a "power-user browser" as it tries to bring features built-in reducing the number of extensions needed.
Vivaldi was founded by Jón S. von Tetzchner, creator of Opera browser and its CEO until before the switch to Chromium.
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Pro Compatible with all Chrome extensions
Since Vivaldi is built on Chromium, the same base as Chrome (among other browsers) is built on, it was possible for Vivaldi developers to allow Chrome extensions to run in their browser.
Pro Tabs can be stacked
Tabs can be grouped under a single tab to easily keep track of all open webpages.
Pro Lots of features and customizability
Vivaldi has a lot of features and customizability. Far more then most (perhaps all) other browses, and many to list them all individuality as separate pros.
Pro Ability to search through settings, history, open tabs, bookmarks in one place
A feature called Quick Commands (accessed via Ctrl + Q) allows quickly getting to settings, history, open tabs, bookmarks with incremental search.
Pro Full of customizable keyboard shortcuts (can be completely keyboard-driven)
It's possible to change and add keyboard shortcuts for basically all commands. It also has single key shortcuts to execute actions with one click.
Pro PC Cross-platform
Vivaldi is available on Windows, GNU/Linux and macOS, so it covers the most used PC operating systems.
Pro Web Panels
Web Panels allow for easy access to any site from the side panel. They are useful for reading two websites side by side or for chatting (i.e. Facebook) and surfing at the same time. Panels can be hidden when not in use.
Pro Mouse gestures
Integrated mouse gestures. Fully configurable as of Vivaldi 1.2 (snapshot available now). Allows for navigating the web, switching tabs, closing windows, opening settings etc. with a flick of the mouse.
Pro Custom search engines
You can add as many search engines as you like. For example you can set up one for YouTube, one for Wikipedia, or whatever you want: you need only the URL of the search and it can be used from the URL bar (by prefixing it's nickname,
yt for YouTube for example).
Everything can be synced with a Vivaldi account. Though there's still no mobile version, you can sync between computers and OSes.
Pro Tab behaviour can be customised
The order you toggle, open, close or clone tabs can be modified to match a workflow that best works for you. For example you can choose tabs to toggle in recent order so you can go back and forth between the last most useful tabs without needing to change their position on the tab bar.
A notes panel allows to save notes from webpages and can include screenshots for reference and have tags and organized in folders to help manage them. Thumbnails are too small and Notes do not have separate page in settings, but it should, there are a lot of things to improve.
Pro Built-in page capture
Vivaldi can grab a picture of the whole webpage or part of it and saves it automatically inside a note or as a file in your disk, or in your elected directory. But I have problems with images of full windows shown on monitor (using X Window System in GNU/Linux). Here I use system XWindow screenshots.
Pro Programmable user interface
Pro Reader mode
Vivaldi has a built-in reader mode so you can remove all the clutter in news pages and read only the content, you can also customise the reader mode, like font size, style and colours.
Pro Analytical history
View graphically your most visited pages on a monthly, weekly, or daily basis.
Pro Tab bar position can be changed
You can change tab bar position to top, bottom left or right.
Pro Manages bookmarks well
Vivaldi has an excellent bookmarks system. Bookmarks can be easily accessible via Speed Dial, side-bar, bookmarks bar, quick commands. No more messy bookmarks bar is needed and location bar suggestion is improved thus!
Pro Non-closable fixed tabs
A setting lets you prevent closing fixed tabs so you don't close anything important by accident.
Pro Dark theme out of the box
There's even an option to automatically transition from light to dark based on the time of day.
Pro Allows navigating to the next page without searching for the link
A feature called "fast forward" puts a dedicated button before the address bar. It takes you to the next page of a multi-page article, forum thread, or search results, without having to hunt for the link.
Pro Saving sessions
It saves oversights many options and functions implemented in Vivaldi. E.g. see CON "No option to open saved tab stack as... tab stack!"
Pro WebRTC IP leaking can be disabled
A built-in setting called "Broadcast IP" will stop the IP leaking with WebRTC when disabled.
Pro Usable fullscreen mode with address bar when needed
In comparison, on Chrome you will not see the address bar, only on ChromeOS when your mouse is on the top of the screen.
Pro Updates via dialog box
Unlike most modern browsers (but like most browsers of yesteryear), Vivaldi gives you a dialog box when an new version comes out; it doesn't just update silently in the background. The dialog box tells you about the changes that have been made, and lets you chose when you want to update.
Pro Fast and safe
It is so faster and safer.
Pro Portable version can be added on default apps
Most portable version cannot be added as default apps but Vivaldi offers that option and it comes with updater too.
Pro Built-in ad and tracker blocker
Vivaldi has a built-in blocker that allows you to select between blocking just trackers or both trackers and ads. With customizable blocking list sources, good performance, and support for all the standard blocker list features you find in ad blocker extensions (with more to come), you might not need an ad blocker extension at all.
This also comes in handy on Android, where Chromium/Vivaldi doesn't support extensions.
Pro GDPR compliant
Pro Customizable UI and colors
Vivaldi can change the colors across the browser and has the option to change the color automatically depending on the page. Also, page loading animations are available in the address bar.
Pro Side panel and status bar
Unlike most modern browsers (but like most browsers of yesteryear), Vivaldi has a status bar. But the status bar is optional, you can turn it off (in the settings) if you don't want it. Vivaldi also has a side-panel, which again, can be turned off.
Con Some non-optional telemetry
Con Not available on iOS/iPadOS
There is an Android version of Vivaldi, but no iOS/iPadOS version yet. iPhone and iPad users are out of luck for the time being.
Con Slower than chrome.
Con Enabling "Hardware Accelerated Scrolling" can make scrolling jittery
Con Can't protect pinned tabs from changing to another URL
Clicking on a page link, then another, easy to wind up far from the original pinned tab site. There is no chrome addon or native vivaldi function to stop this.
Con No automatic page translation
Unlike Chrome, it doesn't automatically translate pages that are not in your language, since this requires service integrations Vivaldi can't afford to buy access to.
Con Same security vulnerabilities as Chrome
Vivaldi uses the same browser engine as Chrome, meaning it has the same security-vulnerabilities as Chrome. Chrome is a big target for hackers (being the most popular browser in the world), and a vulnerability for Chrome will likely also exist in Vivaldi.
Con Still uses some Google services (can be disabled)
Con Sponsored bookmarks
Vivaldi has a number of preinstalled bookmarks, like Amazon. On some occasions, new bookmarks have been added when the browser updates. All of these bookmarks can be deleted, same as any other bookmark.
Con Can't disable all telemetry
Vivaldi needs some amount of knowledge about the amount of active users, for business deals.
Con Enabling "Hardware Accelerated Scrolling" can make scrolling jittery
Con Extensions miss hotkeys
You can set your shortcuts at vivaldi://extensions, but they do not work.
Con No automatic silent background updates, except on macOS
Unlike most modern browsers, Vivaldi doesn't have the option to update silently in the background. It gives you a dialog box when an update comes out. The box doesn't warn you that not updating the browser could expose you to security risks, which could be pretty bad for your average joe, who doesn't know computers that well.
Con No option to open saved tab stack as a tab stack
You may save stack, but you can open it as separate tabs. Interesting that when you save session with stacks, you'll be able to open the stacks with inner settings of page tiling (size and zoom) as well. Contradiction worth of shame.
Con No touch bar support
Con Partially proprietary
While Vivaldi is currently available gratis (without monetary charge), it is currently not fully libre (meaning that it does not allow users to view the source code used to create, to modify that code, or to redistribute modifications).
It is therefore not considered free or open-source software.
The C++ source code, for the Chromium backedn, however is open-source under a BSD license and can be downloaded and browsed from here.
The UI code is not open-source, but consists of easily readable HTML, CSS & JS. Modifications can be shared on their forum's dedicated section.
Con Freezes often
Con Feature creep
Con No built-in proxy
Unlike Opera (but like most browsers), Vivaldi doesn't have a proxy service out of the box. You'll need an extension or an external program, to use Vivaldi with a proxy server.