AtCoderBook is a Chrome add-on developed by ganariya2525 that allows you to save and organize your AtCoder and Codeforces links. With this tool, you can easily bookmark your favorite problems or keep track of problems that you need to review.

The add-on seamlessly integrates with the AtCoder platform, allowing you to save links directly from the problem list by clicking on the "Book" button. Once you have saved your links, you can access them conveniently from the AtCoderBook icon in the top right corner of your Chrome browser.

One of the recent updates also enables you to save Codeforces links, expanding the functionality of the add-on beyond just AtCoder. Additionally, you can now mark your favorite problems, making it even easier to keep track of the ones you love.

AtCoderBook is a free add-on and falls under the category of Browsers with a subcategory of Add-ons & Tools. It provides a simple and efficient way to manage your AtCoder and Codeforces links, making it an essential tool for competitive programmers.