Why do most to-do apps end up abandoned after a few weeks?

Usually not from lack of discipline. The list grows faster than it shrinks, since adding a task takes ten seconds and finishing one takes an hour, so the list itself starts to feel like evidence of failure rather than a useful tool, and people stop opening it rather than face that.

Is it better to have one list or several separate ones?

One list for anything you would otherwise forget, with the sorting happening at a glance rather than through separate apps or folders, tends to survive longer than an elaborate system with multiple lists, categories and projects, simply because it has less overhead to maintain.

Should old, unfinished tasks stay on the list forever?

No. A task sitting unfinished for weeks is either not actually a priority, in which case it should be removed, or it is genuinely important and stuck, in which case it needs to be broken into a smaller first step rather than left as a single vague line that keeps getting skipped.

Do I need a specific named method like GTD to make this work?

No. Named productivity methodologies can help, but the underlying mechanism, a list you actually look at, that stays short enough to look at, works without adopting any particular named system, and adopting one is not required to fix the core problem.

How to Build a To-Do List You Will Actually Use

Most to-do lists are abandoned within a few weeks, and it is rarely because the person using them lacked discipline. It is because the list itself was built wrong.

The actual reason lists get abandoned

Adding a task takes seconds. Finishing one can take an hour, a day, or longer. That asymmetry means an untended list only ever grows, and a list that has grown past a screenful stops being a tool you check and starts being a record of everything you have not done, which is an unpleasant thing to open. People do not quit to-do lists because they lack discipline; they quit because the list became something they no longer wanted to look at, and a tool nobody wants to look at stops being used regardless of how well designed it is otherwise.

Keep the list short, on purpose

A list with sixty items on it functions as a wish list, not a to-do list: nothing on it feels urgent because everything on it is competing for attention equally. A shorter list, built by actively removing what does not belong rather than only ever adding, keeps every item visible enough to actually register. This usually means being ruthless about item three below.

Separate "would be nice" from "actually needs doing"

Most long lists are a mix of genuine near-term tasks and vague someday intentions sitting side by side. "Call the dentist" and "learn a language" do not belong on the same list with the same weight: one is a task, the other is a goal wearing a task's clothing. Keeping only real, doable tasks on the working list, and letting the rest live somewhere else entirely or not at all, stops the list from being permanently cluttered with things that were never going to get checked off this week.

Clear finished items instead of leaving them

A completed task that stays visible does two things: it clutters the view, and it quietly signals that the list is a permanent archive rather than a working set of what is left to do. Clearing finished items regularly, rather than scrolling past a growing pile of crossed-out lines, keeps the list reading as "what's left," which is the only question it needs to answer.

Deal with tasks that keep getting skipped

A task that has sat unfinished for weeks is telling you something specific: either it is not actually a priority, in which case removing it is honest rather than a failure, or it is genuinely important and too large or vague as written, in which case the fix is breaking it into a first concrete step rather than leaving it as one intimidating line that gets scrolled past every day. "Sort out taxes" sits on a list forever. "Find last year's return" gets done in ten minutes and moves the larger task forward.

What this looks like in practice

None of this requires a named methodology or a dedicated app with folders, tags and due dates. A single list that opens instantly, lets you add a task in one keystroke, tick it off, and clear what is finished, covers the actual mechanism above without any extra structure to maintain. The to-do list on this site is built to exactly that shape: add, check, clear, saved automatically in your browser, with no account and nothing to configure before you can start using it.