Yes, CoW is free to use
Everyone starts with the free Deckhand plan. It gives you unlimited bookmarks, unlimited Caves, and unlimited Chests, so you can organize as much of your collection as you need.
Start with the collection you already have
You can import bookmarks from Chrome during setup, create separate Caves for different parts of your life, and use Chests to keep related bookmarks together.
Learn how to get started with Caves of Wonders (CoW) or import your Chrome bookmarks.