Counter for Todoist is a Chrome extension developed by Cside. It falls under the category of Browsers, specifically Add-ons & Tools. The extension's main functionality is to display the number of uncompleted tasks in Todoist directly on the toolbar. This feature provides users with quick access to their pending tasks without the need to navigate through the Todoist interface.

The program is free to use and offers a convenient way for Todoist users to stay updated on their task progress at a glance. For individuals who heavily rely on Todoist for task management, this extension can enhance productivity by providing a constant reminder of pending tasks.