Atcoder Companion is a Chrome extension developed by conlacda, available for free in the Browsers category under Add-ons & Tools. This extension is designed to enhance your Atcoder experience by streamlining your workflow and boosting productivity.

With Atcoder Companion, users can efficiently manage their problem submissions by checking the status of submitted problems, adding test cases to problem statements, and easily copying and downloading test cases. Additionally, the extension provides a custom test page to facilitate debugging processes, making it easier for users to test their solutions.

Experience a smoother Atcoder journey with Atcoder Companion's useful features, aiming to optimize your coding experience and improve your efficiency.