---
name: Peak-end rule
slug: peak-end-rule
category: Memory
categories: [Onboarding, Retention]
evidence: strong
page: /principles/peak-end-rule/
updated: 2026-10-15
---

# Peak-end rule

> People remember an experience by its most intense moment and its ending, not by its length.

## What it is

The peak-end rule describes how people judge past experiences: mostly by how they felt at the best or worst moment and at the end, while the overall duration barely counts.

## Evidence

In a classic experiment, people held a hand in painfully cold water at 14 °C for 60 seconds, and on another occasion for 90 seconds, where the last 30 seconds were slightly less cold. Asked which trial they would rather repeat, 69% chose the longer one: more pain overall, but a better ending. The pattern holds outside the lab. In a randomized trial with 682 colonoscopy patients, those whose procedure ended with a short, milder extra interval rated the whole experience as less unpleasant and were somewhat more likely to come back for a repeat colonoscopy in the following years. A 2022 meta-analysis of 174 effect sizes found a large effect of peaks and endings on how people rate experiences, and almost no effect of duration. In products, the moments that shape memory, and whether people come back, are the high point and the last screen.

## How to apply

- Design the last step of every flow with care: the order confirmation, the end of onboarding, the final screen of a cancellation.
- End on a high by showing what the user achieved (“Your site is live”) instead of a plain “Done”.
- Find the peak moment, such as the first useful result, and make it clear, fast and worth noticing.
- Fix the worst moment first. One painful step can define the memory of an otherwise smooth flow.

## What to avoid

- Ending flows on an upsell, a survey or an error. The last screen is the one people remember.
- Making cancellation end in friction or guilt. It is often the last memory a former customer keeps.
- Shortening a flow at the cost of a worse ending. Duration matters less than the worst moment and the end.

## Live examples

- Duolingo ends every lesson on a celebration that reports XP, accuracy and time, so the last thing felt is the result rather than the hardest question.
- Headway closes the daily session by ticking off the three things it contained, turning the exit into a summary of what was finished.
- Nibble gives the streak its own screen at the end of the session, so the final frame is the gain the user just made rather than a prompt for more.

## References

- Kahneman, Fredrickson, Schreiber & Redelmeier (1993). When More Pain Is Preferred to Less: Adding a Better End. Psychological Science. — https://doi.org/10.1111/j.1467-9280.1993.tb00589.x
- Redelmeier, Katz & Kahneman (2003). Memories of Colonoscopy: A Randomized Trial. Pain. — https://doi.org/10.1016/S0304-3959(03)00003-4
- Alaybek et al. (2022). All's Well That Ends (and Peaks) Well? A Meta-analysis of the Peak-End Rule and Duration Neglect. Organizational Behavior and Human Decision Processes. — https://doi.org/10.1016/j.obhdp.2022.104149

## Similar principles

- Labor illusion — /agents/labor-illusion.md