To-Do List

In your own browser, using local storage. Nothing is sent to a server, there is no account, and no one else can see the list. The trade-off is that the list belongs to one browser on one device: it will not appear on your phone, and clearing site data or using a private window will empty it.

Yes, as long as you use the same browser on the same device and do not clear site data. Local storage has no expiry date, so a list survives closing the tab, quitting the browser and restarting the computer.

Once the page has loaded, yes. Everything runs in the browser, so adding, completing and deleting tasks all work with no connection. You need to be online only to load the page itself.

Local storage cannot sync on its own, so a list does not travel between devices or browsers. Copy the tasks across by hand, or use a hosted task app if syncing matters more than privacy.

Tasks that name a physical next action rather than a topic. "Email Sam the Q3 figures" is doable; "Q3 report" is a project pretending to be a task. Research on goal setting consistently finds that specific, concrete intentions get completed far more often than vague ones.

The Zeigarnik effect: interrupted or incomplete tasks are recalled more readily than completed ones. Writing a task down and giving it a definite next step reliably reduces that intrusive rehearsal, which is a large part of why a list feels like relief.