Envelope Back is a Chrome extension developed by sirui.dev. It is a free Kanban style todo manager that allows users to organize their tasks using both time and project grouping.

With Envelope Back, users can easily drag and drop tasks to different lists, creating as many lists as they need. The extension also offers a history feature, where cleared todos are saved in editable text, allowing users to review and make changes if needed. The Ctrl-Z function is available for undoing any accidental actions.

One notable feature of Envelope Back is its GitHub-like contribution chart. This chart provides users with a visual representation of their task completion progress, helping them stay motivated and track their productivity.

The latest release, version 0.4.0, introduces a new waterfall layout in the drawer and supports auto timestamp when cleaning checked todos into history. The update also includes some small UI polishing and fixes a bug related to drag and drop functionality in Safari.

Overall, Envelope Back is a handy tool for individuals looking for a simple and efficient way to manage their tasks using the Kanban method. It offers useful features like drag and drop, history tracking, and a contribution chart to enhance productivity and organization.