Check ! is a free Chrome extension developed by 九月. It falls under the category of Browsers and is categorized as an Add-ons & Tools. Check ! is a simple todolist application that aims to help users manage their tasks and thoughts clearly.

The interface of Check ! is user-friendly, making it easy for users to navigate and utilize its features. Users can easily add or remove tasks with just a few clicks, allowing for efficient task management. One of the standout features of Check ! is its ability to persistently store data, ensuring that users' tasks are not lost even if they close the browser.

In addition, Check ! offers a draggable and droppable functionality, enabling users to easily organize and prioritize their tasks. The application also provides notification capabilities, ensuring that users are reminded of their pending tasks.

Overall, Check ! is a simple yet effective todolist application for Chrome users. Its friendly interface, easy task management, persistent data storage, draggable and droppable functionality, and notification capabilities make it a valuable tool for staying organized and productive.