To-do list
Add your tasks, check them off as you finish, and reorder them any way you like: the list is saved in your browser and it's right there on your next visit.
Why a simple list works better
The big productivity apps offer projects, labels, priorities, and due dates: powerful, but you often end up organizing the list instead of doing the work. A bare-bones to-do list like this one applies the method that actually works: write the task down the moment it pops into your head (freeing up mental bandwidth), check it off the moment it's done, and keep an eye on just two numbers — how many things are left and how many you've already knocked out. A practical trick: phrase every item with an action verb ("call the dentist," not "dentist") and break big tasks into steps that take less than half an hour.
Where is my data stored?
The list lives in your browser's localStorage, a small local store tied to this site and this device. No data ever leaves your computer or phone: there's nothing to sign up for and nobody else can read it. The flip side: if you clear your browsing data or use private browsing, the list is gone, and it doesn't sync between devices on its own. For an important long-term list, copy it somewhere else once in a while.