Add tasks, tick them off and clear them when you are done. The list saves in your browser, with no account or ads.
Write tasks as clear next actions, such as "email Priya the invoice" rather than "invoice". Try to keep three must-do items at the top each day.
Yes, it is free with no sign-up.
In your browser's local storage on this device.
Once the page has loaded, adding and ticking tasks works without a connection.