It shows your tasks Gantt and Kanban and an executive view. The difference is that it understands The dependencies between tasks, computing Critical path and how many days each task can slip before it delays anything else. So "you have overdue tasks" becomes "this one delay is what matters, the rest have float".

1. Your employees' names and their tasks Internal data, so they are never uploaded anywhere.
2. Cut the internet and try, the tool runs in full and saving writes to your file directly.
3. This page is locked by a connect-src 'self' policy, meaning the browser itself blocks it from sending anything to any outside party. The only connection allowed is the visit and event counter on the same domain, and it carries nothing from your file.

The tool writes to the Tasks sheet alone, and leaves every other sheet, your formatting, and your formulas exactly as they were. It saves only when you press Save yourself, and it takes a backup before the first write.