A product I built
Loop.
One nudge, at the right minute. For people who already know what they should do.
The problem
Knowledge is not the gap. Timing is.
People do not fail at eating well or moving more because the advice was wrong. They fail because nothing reaches them at the moment they actually decide — the 3pm slump, the 8pm delivery app, the night that runs late. Every wellness product I have used reports the day after it is over.
The bet
Interrupt instead of measure
The big trackers are excellent at telling you how you recovered from a week you already lived. Loop asks for twenty seconds, works out the one habit that moves your own energy, and says something once, at the minute it matters.
How it works
01
Twenty seconds, once a day
Did you get protein at breakfast. Did you move. How did you sleep. How did the day feel. Five taps, no food database, no barcodes.
02
Loop finds your pattern
Not a study about people like you — your own last three weeks. It compares days you did the thing with days you didn't, and keeps the habit with the biggest gap.
03
One nudge, at your minute
At the hour your energy historically falls, Loop says one thing: walk now, eat protein now, wind down now. Then it stops.
Where it came from
I wore a Whoop. Then I stopped chasing the number.
What it taught me wasn't a new habit. It was dropping one: I stopped chasing the number and started trusting how I actually feel.
So I took the band off and kept the routine — the same sleep, the same movement, the same week. Nothing fell apart.
That is the bet behind Loop. The habits were already mine; the device was only holding them for a while. So Loop asks for twenty seconds, says one thing at the minute it matters, and stops. No band, no score to chase.
Why I believe the premise
I did not want a portfolio project built on my own hunches, so every claim here is checked against a published source.
Attention genuinely falls in the mid-afternoon.
A review of circadian rhythms in attention found performance improves toward noon, then drops between 14:00 and 16:00 — the post-lunch dip, driven by the body clock rather than by what you ate.
Circadian Rhythms in Attention, PMC ↗Wakefulness dips mid-afternoon even on a normal day.
NIOSH's fatigue training material describes the same window: circadian rhythms that promote wakefulness dip in the middle of the afternoon while sleep pressure keeps building.
CDC / NIOSH, Afternoon Dip in Wakefulness ↗Support has to arrive at the right minute to work.
The research field this product borrows from is called just-in-time adaptive interventions: providing the right type of support at the right time — neither too early nor too late.
JITAI design principles, PMC ↗Knowing what to do is not the problem.
The World Health Organization reported that adherence among patients with chronic conditions in developed countries averages about 50% — people who know the plan still don't run it.
World Health Organization, 2003 ↗Trackers get abandoned.
In one small study 34% of users had abandoned their wearable within nine weeks, and reviews of the area find many people stop tracking after a few months.
IEEE MDM 2017; Computers in Human Behavior 2020 ↗Ten minutes of walking beats a sugar snack for energy.
In a controlled comparison, ten minutes of brisk walking raised self-rated energy and lowered tiredness more reliably than a candy bar.
PubMed, Taylor et al. ↗What it deliberately leaves out
No wearable. A band measures the night you already had.
No calorie counting. Nobody quits because the maths was wrong.
No streak shame. Loop is a nudge, not a scoreboard.
Being honest about it
- → Notifications only reach you while a Loop tab is open. A real launch needs email or a mobile push, and I would pick one of those next.
- → A pattern needs roughly two weeks of logs before the comparison means anything. Before that, Loop asks for patience.
- → The comparison is a correlation across your own days, not a clinical finding. It tells you where to experiment, not what is wrong with you.
- → Loop is not medical advice and makes no health claims.