Calendar is a free Chrome add-on developed by Mythical 5th. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. With a simple keyboard shortcut of Alt+C, users can easily access this handy calendar tool.

The Calendar add-on provides users with a convenient way to view the day, month, and year directly from their Chrome browser. Unfortunately, in September 2023, an update to Chrome has resulted in the removal of the full-month grid feature. This feature utilized the Flexbox and Grid layout modes of HTML, which have been negatively affected by the update.

Despite this setback, Calendar remains a useful tool for quickly checking dates and keeping track of the current day, month, and year. Its straightforward interface and easy accessibility make it a valuable addition to any Chrome user's browsing experience.