Let's start off with stating that I never use in-browser bookmark solutions. You never know if you will end up changing which browser you default to, as it can depend vastly on workflow or what you happen to be working on.

Long ago I remember utilizing del.iciou.us (and enjoyed using it very much). It was then acquired by Yahoo and who knows who else later. Long story short, I've been without a great way to maintain, organize and manage bookmarks. Until now. Superdense solves the issues I've had. Modern, slick and compact design. More visual for quick reference.

I see a great future for this offering and look forward to it. New feature that was just added was the capability to open an entire "category" of bookmarks in multiple tabs in Chrome. They also added optional passwords for Public Bookmark Pages. Awesome for projects and to jumpstart whatever is being worked on. The ability to share a pre-built Bookmark page for team onboarding and for team reference is an amazing use-case, as well.

Full stack, no hesitation. Get it while you can and be happy you did.