The GTD Inbox: Why Your Head Is the Worst Place to Keep Track of Things

We’ve all been there: you’re in the shower, or doing whatever, and it suddenly hits you that (just to pick an example) you need to renew your passport. You get out, dry off, pick up your phone to check which documents you need, and a notification pops up, you answer the message… and the passport is gone.

The passport will come back a week later, or at three in the morning, when there’s nothing you can do about it, and it’ll bring company: calling the plumber, buying your mom a present, that really important email you never sent.

What usually happens here isn’t that you have a bad memory. It’s that you’re asking your mind to work in a way it doesn’t do well, to do something it isn’t built for. That’s why, today at duqe, we want to talk about the simplest tool in the GTD method (Getting Things Done, by David Allen; published in Spanish as Organízate con eficacia), and for us the most important one: the inbox (or in-tray).

How unfinished tasks affect us

David Allen, the author of Getting Things Done, calls each of these things an “open loop”: anything that pulls at your attention but isn’t where it should be, or in the shape it should be. They range from renewing your passport (something you have to do) to a vague idea that someday you should sort out the photos on your phone.

The thing about open loops is that forgetting them doesn’t close them. They’ll sit in some corner and resurface whenever they feel like it, and that will almost never be when you can deal with them. One of Allen’s best ideas is relevant here: your mind is for having ideas, not for holding them.

On the scientific side, the Zeigarnik effect (named after Bluma Zeigarnik, who noticed a century ago that we remember interrupted tasks better than finished ones) is often cited as proof that unfinished business “sticks” in our memory. However, a meta-analysis by Romain Ghibellini and Beat Meier reviewed almost a century of studies and concluded that this memory advantage doesn’t hold up in general. What they did find is that we tend to go back to tasks we left half done: unfinished things aren’t remembered better, but they keep claiming our attention.

Two interesting studies pick up this thread.

In 2011, E. J. Masicampo and Roy Baumeister found that unfulfilled goals cause intrusive thoughts and hurt performance on completely unrelated tasks. They also saw that when participants were allowed to write down a specific plan for that goal, the interference went away, even though the goal still hadn’t been met.
In 2018, a team led by Michael Scullin measured the sleep of 57 people. Those who spent some time before bed writing down their to-dos for the next few days fell asleep, on average, about nine minutes sooner than those who wrote about what they’d already finished. Nine minutes isn’t much, but it shows a real effect on the mind.

The conclusion we can draw is that you don’t need to finish something for it to stop circling in your head; it’s enough for your mind to trust that it’s written down somewhere reliable. That somewhere should be the inbox.

What is an inbox?

In GTD, the inbox, or in-tray, is where you put everything before deciding what it is (a task, a reminder, information…). The first edition of Organízate con eficacia I read talked about a physical tray, for example, but these days, with how easy technology makes it, it will usually be a digital list.

It’s the first of the five steps Allen proposes (capture, clarify, organize, reflect, and engage). It sounds obvious. Everyone “writes things down.” What almost nobody does is write down everything, always in the same place, without stopping to think. That’s the real power of the inbox, even if it tends to be underestimated.

The rules of capture are few:

Capture everything. The important and the trivial. If it’s taking up space in your head, it goes in the inbox. You’ll decide whether it’s silly or not when you process it.
Capturing isn’t deciding. When you write something down, you don’t ask where it goes, what priority it has, or whether it’s a good idea. You just get it out of your head and onto the list.
Few inboxes. The more centralized your inbox, the better (in our case, the app has a general Inbox).
Empty it regularly. Of course, it won’t do you much good if you don’t deal with it regularly and send things where they belong. Some people suggest doing it every three days, for example, or during the weekly review. We believe in at least once a day, but it’s worth doing whenever you have a moment (without letting it become an obligation that creates friction; adapt it to your lifestyle and your needs).

Why most inboxes fail

The idea is pretty simple. So why do so many people start out enthusiastic and, three weeks later, are back to trusting their memory? The usual suspect: friction (what duqe tries to remove). More specifically, it almost always breaks down in one of these three places.

1. Capturing takes too much effort.

An idea lasts in your head for as long as it takes you to get distracted, which these days is no time at all. If writing it down means unlocking your phone, finding the app, waiting for it to load, and picking a project and a tag, you won’t do it. Or you’ll do it three times and then stop. Capturing has to be faster than forgetting.

2. You have too many inboxes without realizing it.

The notes on your phone, the WhatsApp messages you send yourself, screenshots, emails marked as unread, the Post-it on the fridge. Each one works as an inbox, but none of them is your inbox. If something is in one of five places and you don’t know which, it might as well be nowhere.

3. It never gets emptied.

Writing things down brings instant relief, so you write them down. But if you never look again, the inbox turns into a graveyard of to-dos, and of course your mind notices. As soon as it stops trusting that place, it goes back to its old habit: reminding you of things at the worst possible moment.

So we can’t treat the inbox like a mailbox that receives things: only we can put things in it. Nor can we treat it like a to-do list: whatever comes in has to be processed and moved to its place later, like a waiting room.

How to empty it without turning it into another chore

As I said, even though we’re in favor of emptying the inbox every day, we can’t let it become a chore (that would bring back friction, then procrastination, and then not doing it at all). Emptying the inbox doesn’t mean doing what’s in it. It means taking each item and answering the two questions Allen asks: What is it? and Is it actionable?

If it isn’t actionable, it has three possible destinations: the trash, your reference material (the second brain is another of the philosophies duqe is built on; we’ll publish a post about it soon), or any “Someday/Maybe” lists you keep for things you won’t do now but don’t want to lose.
If it takes less than two minutes. STOP. Allen, and many of the authors who encourage the two-minute rule, mix two things up: speed and effort. In our philosophy, the two-minute rule is flexible, and we’d replace it with this: if it takes me less than 10 minutes and I can do it right now, with no friction and without giving up something else, I do it. If not, it gets processed like everything else.
If it takes more than that. Decide what the next physical step is and move it where it belongs: to a project, to your calendar if it has a date and time, or to someone else if it isn’t yours to do.

Where to capture when your phone is the very thing distracting you

Here’s the paradox. The tool you always have on you, which could be the best option for your inbox, is also a constant distraction. You take out your phone to write something down, but you have to find the app, open it, select the inbox… and not get sidetracked along the way. Once again, the passport doesn’t get written down.

This is part of what we’re trying to solve with duqe, and we share it as an example of how it can be approached, not as the only way. duqe is an Android launcher: it replaces your phone’s home screen. So the first thing you see when you unlock it isn’t your apps, it’s your system. And on that screen there’s a button that says INBOX.

Tap it and a window opens where you can type anything, and it goes straight to your Inbox list. No picking a project, no tags, no date: just whatever crossed your mind, one way or another. If typing isn’t convenient right then, you can attach a photo (from the camera or the gallery) or record a voice note. If you don’t give it a title, it’s saved anyway with a generic one, and you can fix it when you empty the inbox. It’s rule 2 built into the design: capturing isn’t deciding.

For when you’re not on the home screen, there are two more ways in:

The floating button. You can turn on a small INBOX button that floats over other apps when you leave the launcher (it needs Android’s permission to display over other apps, but it’s one of duqe’s best features). You’re reading something in your browser, you remember something, you tap the button, jot it down, and pick up where you left off: you remove every last bit of friction.
Share. From almost any app, Android’s Share button offers “duqe · INBOX.” A link, some text, a photo, an audio clip, or a PDF lands in your inbox without opening anything else.

Several doors, all leading into the same room. That’s the difference from having five inboxes: it doesn’t matter how something comes in, it ends up in one place.

What no tool can do for you

No app, duqe included, is going to empty your inbox for you. And that’s how it should always be, because the value of the inbox will never lie in where you write things down, but in the deal you make with yourself: everything that goes in will be looked at, decided on, and put in its place. As long as you keep that deal, your mind will leave you alone, you’ll work better, and you’ll focus on what you’re doing with a clear conscience.

If you want to try it without installing anything, start tonight. Grab a piece of paper or your phone’s regular notes app and spend five minutes writing down everything you have pending (big things, small things, ridiculous things). The next day, work through it, sorting out whether each item is a task, which project it belongs to… Chances are you’ll move things forward better, and with a calmer mind.

After that, find a way to make capturing take even less effort than that (you can try duqe or organize yourself some other way).

And of course, if there’s anything we can help with, or you’re not sure how to start getting organized, feel free to get in touch through the form on the Help page or by emailing us directly at info@duqe.app.

Sources

David Allen (2015), Getting Things Done: The Art of Stress-Free Productivity, revised edition, New York: Penguin Books. Spanish edition: Organízate con eficacia, revised edition, Barcelona: Empresa Activa, 2015.
E. J. Masicampo and R. F. Baumeister (2011), “Consider it done! Plan making can eliminate the cognitive effects of unfulfilled goals,” Journal of Personality and Social Psychology, 101(4), 667-683. doi:10.1037/a0024192
M. K. Scullin, M. L. Krueger, H. K. Ballard, N. Pruett, and D. L. Bliwise (2018), “The effects of bedtime writing on difficulty falling asleep: A polysomnographic study comparing to-do lists and completed activity lists,” Journal of Experimental Psychology: General, 147(1), 139-146. doi:10.1037/xge0000374
R. Ghibellini and B. Meier (2025), “Interruption, recall and resumption: a meta-analysis of the Zeigarnik and Ovsiankina effects,” Humanities and Social Sciences Communications, 12, 962. doi:10.1057/s41599-025-05000-w
B. Zeigarnik (1927), “Das Behalten erledigter und unerledigter Handlungen,” Psychologische Forschung, 9, 1-85. doi:10.1007/BF02409755