Vivaldi is an excellent browser, but it sometimes seems like it has too many options. For example, tab groups and tab workspaces are almost the exact same idea.

Arc is basically someone looking at Vivaldi and hitting it with the "design stick". I didn't anticipate I'd love it as much as I do. Since it's Mac-only I only use it on my work machine, but that's 80% of my browsing anyway and I have no desire to sync my work shit anywhere else.