By Renato, who builds Kept · · updated
Reminders stop working because most of them only repeat the intention you already had.
"Call Mum" at 9am tells you nothing new, arrives when you can’t call, and leaves you to restart the whole task later, which is the step that failed in the first place. Their effect also wears off: in trials of app notifications, the lift in engagement decayed day by day over the first month. What works better is a cue tied to a situation you will be in, carrying what you need to act on it.
The short version
- Notification effects are real and short-lived, and more of them than you want produces fatigue.
- A reminder that only names the task hands the remembering straight back to you.
- Tying an action to a specific situation has a medium-to-large effect on follow-through.
- Capture was never the hard part; getting the right thing back at the right moment is.
- For adults with ADHD the planning step is where the largest impairment showed up, so the plan has to live outside your head.
What a reminder actually gives you
Look at what is on the screen when a reminder fires. A few words, usually written by you, naming something you already knew you had to do. It carries a fact and no means of acting on it.
If it arrives while you are driving, cooking or in a meeting, you do the only thing you can: dismiss it and intend to do the task later. That is the same intention you had before the reminder, now with nothing scheduled to bring it back.
The reminder has not failed to remind you. It has reminded you successfully and achieved nothing, because knowing was never the missing part.
Why they fade
The decay is measurable. Micro-randomised trials of push notifications in behaviour-change apps found that notifications raise engagement in the short term and that the effect shrinks steadily across the first thirty days. Frequency above what people want produces fatigue and loss of interest.
Those trials were run on health apps, so the numbers do not transfer to your calendar. The pattern does, and anyone who has set forty recurring reminders knows it from the inside: within a month they are being swiped away unread.
Every reminder you ignore also teaches you to ignore the next one. A system with too many alerts ends up with fewer that work than a system with three.
A time is not a situation
The strongest evidence in this area is about a different kind of prompt. Gollwitzer and Sheeran pooled 94 tests covering more than 8,000 people and found that an intention plus a specific plan, "when I am in situation Y, I will do X", had a medium-to-large effect on getting the thing done compared with the intention alone.
The difference from a reminder is what triggers it. "9am" is a time, and at 9am you could be anywhere. "When I sit down on the train" is a situation, and it comes with free hands and a few empty minutes. The situation does the remembering.
This matters most where planning is the weak point. In a laboratory study of adults with ADHD, the largest impairment was at the planning stage of a remember-to-do-it-later task, not at carrying it out. That is a lab finding in a clinical sample, but it suggests where the support belongs: in making the plan concrete once, somewhere outside your head.
The cue has to carry the content
Lifelogging research reached a blunt conclusion: recording things was never the bottleneck. The systems captured everything and produced archives nobody opened. What mattered was whether the right piece came back at a moment it could be used.
The same is true of a reminder about a person. "Message Priya" brings back the task. "Priya’s scan results were due Tuesday, ask how it went" brings back the reason, and the message is half written.
When researchers gave people a wearable camera and had them review its images, reviewing was a strong cue for recalling the day months later, and clever triggering did not beat review at plain regular intervals. Regular and specific beat smart.
What to actually do
Delete most of your recurring reminders. Keep the ones tied to a real deadline, and let the rest go, since you have already stopped seeing them.
For the things that matter, rewrite each one as a situation and a detail: where you will be, and what exactly you will do or say. One line is enough.
None of this needs an app. A calendar entry with a full sentence in it does the job. What does not work is a louder version of the reminder you are already ignoring.
Questions people ask
- Do reminders work at all?
- Briefly. In trials of app notifications they raised engagement at first, and the effect decayed day by day over the first month. Too many of them produced fatigue.
- What works better than a reminder?
- A plan tied to a situation: "when I am on the train, I will message Tom". Across 94 tests, adding that kind of plan to an intention had a medium-to-large effect on following through.
- Why do reminders work even less well with ADHD?
- The research here does not test reminders in ADHD directly. It does show that adults with ADHD had their largest impairment at the planning stage of remembering to do something later, and a bare reminder leaves that planning to you.
Where this comes from
Every claim above traces to one of these. Each has its own page with the method and what it doesn’t show.
Notifications work, and then stop working
Bidargaddi et al., and the eHealth attrition literature (2018) · JMIR mHealth and uHealth
Deciding when and where you’ll do something roughly doubles the odds you do it
Gollwitzer & Sheeran (2006) · Implementation intentions and goal achievement
The intention arrives, and then evaporates before it becomes an action
Altgassen et al. (2013) · PLOS ONE
Recording everything produced huge archives and nothing useful
Sellen & Whittaker (2010) · Communications of the ACM
Reviewing a partial capture cues recall months later
Hodges, Berry, Wood et al. · SenseCam autobiographical memory research
Read next
Why you forget to text people back
You read it, you meant to answer properly, and then the moment passed. The problem is that replying properly is a task disguised as a message.
ADHD and friendships: why you lose touch with people you love
It is rarely about caring less. The thought to get in touch arrives when you can’t act on it, and friendships are the tie that fades when contact stops.
How to remember birthdays, and what to do when you do
The date is the easy part: store it once and let something remind you. What people forget is the plan for the day, and what to say beyond "happy birthday".
Kept is what we built from this.
Nine seconds of talking after you see someone. Kept files it against the right person and hands it back the day before it matters. No streak or score on anyone in it, and it never writes your messages.
Or see how it compares to the alternatives, including where they beat it.