ato-ichinen is a free Chrome add-on developed by amazedkoumei. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This add-on allows users to limit their Google search results to only show results from the past year.

One of the main features of ato-ichinen is the ability to toggle between active and inactive modes. When active, it restricts the search results to only show results from the past year. This can be done by simply clicking on the add-on icon. The add-on also provides a convenient way to switch between active and inactive modes.

Overall, ato-ichinen is a useful add-on for Chrome users who want to limit their Google search results to a specific time frame. It provides a simple and convenient way to filter search results, making it easier to find relevant and up-to-date information.