# Sixty Six: One Habit — 66 days. No streaks.

> 66 days. No streaks. (iPhone/iPad app by Alejandro Paez.)

- Source: https://appshunter.io/ios/app/sixty-six-one-habit/id6796533240 (this page in markdown: same URL + `.md`)
- Developer: [Alejandro Paez](https://appshunter.io/developer/1762690324)
- Category: Health & Fitness, Lifestyle
- Price: $3.99
- Age rating: 4+
- Requires: iOS 17.0 · 3 MB
- Languages: American English
- Released: 2026-08-13
- Data updated: 2026-08-25
- User reviews in markdown: https://appshunter.io/ios/app/sixty-six-one-habit/id6796533240/reviews.md

## What is Sixty Six?

It takes 66 days, not 21.

The 21-day rule comes from a 1960 book by a plastic surgeon, describing how long his patients took to adjust to their new face in the mirror. It was never a study, and it was never about habits.

In 2010, researchers at University College London followed 96 people building real daily habits. Among those whose data fit the model, the median time for a behaviour to become automatic was 66 days. The range ran from 18 days to over 250.

Sixty Six is built on that finding, and on one sentence buried in it: missing a single day did not materially affect the process.

So this app has no streaks. Nothing to break, nothing to protect, nothing that punishes you for a Tuesday you were ill.


ONE HABIT AT A TIME

You can't add a second. The constraint is the point — the research is about one behaviour becoming automatic, not about managing a list of them.


THE ORB IS THE PROGRESS BAR

There is no percentage anywhere. Instead there's a single sphere that grows as you show up: small and dim on day one, filling most of the screen by day sixty-six. It breathes. You learn to read it without being told.

On the day it's yours, it fills the screen entirely, tells you three true things, and settles into your archive.


WHAT IT DOESN'T HAVE

- No streaks. The number counts days you showed up, and it only goes up.
- No statistics. No completion rate, no charts, no longest run — every one of those is a way of scoring you against yourself.
- No account. No sign-up, no email, no password.
- No ads. You bought it once.
- No gamification. No points, no badges, no levels, no confetti.


REMINDERS THAT KNOW WHEN TO STOP

One a day while you're building. Miss a few and they slow down instead of piling up; after a week they drop to once a week. And the day after you miss one, the reminder tells you the truth: missing one day doesn't undo anything.

On day 66 they stop for good. Sixty Six will not ask you to start another one.


ALSO

- A home screen and Lock Screen widget, so the orb exists without opening the app
- Six colour worlds, chosen from what you type
- Syncs privately through your own iCloud account — nothing reaches us, ever
- Works completely offline

One habit. Sixty-six days. Then it's yours.


The research: Lally, van Jaarsveld, Potts & Wardle, "How are habits formed: Modelling habit formation in the real world", European Journal of Social Psychology, 2010.


## Version history (last 1 release)

### 1.0 — 2026-08-14

No release notes.

## More apps by Alejandro Paez

- [Minimalistic Visual Timer](https://appshunter.io/ios/app/minimalistic-visual-timer/id6636465187)
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- [Reflexion en 5](https://appshunter.io/ios/app/reflexion-en-5/id6742806057)
- [Calm Between](https://appshunter.io/ios/app/calm-between/id6761934258)
- [PocketBM](https://appshunter.io/ios/app/pocketbm/id6786824016)
- [Meridiem — World Clock](https://appshunter.io/ios/app/meridiem-world-clock/id6796129719)

All apps by Alejandro Paez: https://appshunter.io/developer/1762690324

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*