# 66 Days - Habit Tracker — Build Good Habits & Break Bad

> Build lasting habits through consistent daily tracking over 66 days. (iPhone/iPad app by Epipherse.)

- Source: https://appshunter.io/ios/app/66-days-habit-tracker/id1439590647 (this page in markdown: same URL + `.md`)
- Developer: [Epipherse](https://appshunter.io/developer/1231938524)
- Category: Productivity, Lifestyle
- Price: Free with in-app purchases
- Rating: 4.10/5 from 9 App Store ratings · 48 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.0 · 16 MB
- Languages: American English, Arabic, French (France), German (Germany), Indonesian, Italian, Japanese, Korean, Russian, Chinese (Simplified, China) and 3 more
- Released: 2018-10-29
- Data updated: 2026-09-02
- Monetization: freemium
- User reviews in markdown: https://appshunter.io/ios/app/66-days-habit-tracker/id1439590647/reviews.md

## What is 66 Days?

According to a landmark study by University College London (UCL), it takes an average of 66 days for a new behavior to become an automatic, lifelong habit.

You don't need extreme willpower or superhuman effort. By repeating small, consistent actions every day, your brain naturally transforms them into effortless routines.

66 Days is designed to help you organize your life goals into actionable projects, maintain daily streaks, and conquer the 66-day milestone to transform your lifestyle.

[ 66 Days Key Features ]

1. Project-Based Habit Building
• Set meaningful goals like 'Lose 10 kg' or 'Read 20 Books' and attach daily micro-actions (e.g., 30 push-ups, read 15 mins).
• Completing just one habit action per day keeps your streak alive!

2. Break Bad Habits & Quit Tracker
• Track your clean streaks for quitting smoking, junk food, procrastination, or screen time.
• Log reflections when overcoming cravings and watch your milestone gauges grow.

3. Insightful Analytics & Milestones
• Visualize your consistency with heatmap calendars, weekly trends, and overall statistics.
• Reach 66 days to enshrine your achievement in the permanent 'Success Collection' and unlock badges.

4. Personalized Cards & iOS Widgets
• Customize each habit card with custom photos, elegant color palettes, and blur themes.
• Stay on top of your daily routines directly from your Home Screen with beautiful widgets.

5. Privacy & Biometric Lock
• Keep your personal habit journal safe with Face ID and Touch ID biometric locking.

6. Lifetime Access & Premium
• Unlock all premium features permanently with a single one-time purchase—no subscription stress.

Start today. In 66 days, you will meet a completely new version of yourself!

Terms of Use (EULA): https://66days.epipherse.com/terms/
Privacy Policy: https://66days.epipherse.com/privacy/

## Key features

- 66-day habit building system
- Project-based goal setting
- Daily progress tracking
- Memo and photo recording
- Dark mode support
- Push notifications

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium 1 Month | $1.49 | per month |
| Premium 3 Month | $3.99 | per 3 months |
| Premium 1 Year | $7.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Project Streak Recovery | $2.99 | one-time |


## Recent user reviews (10 of 48)

All indexed reviews: https://appshunter.io/ios/app/66-days-habit-tracker/id1439590647/reviews.md

### 4/5 — 데이터 수정은 불가능한가요?

*2026-05-24, version 2.7.0*

안녕하세요. 전날 습관 체크를 못해서 다음날 하려 하는데 데이터를 수정할수는 없는건가요?

### 5/5 — 습관형성은 이앱으로

*2025-08-12, version 2.6.0*

미니멀리즘의 끝판왕인 습관앱. 단순한거 좋아하는 사람에겐 goat 앱. 직관적인 형성가능. 연속일기능도 좋습니다. 구독료가 진짜 싸서 좋아요.

### 5/5 — 러시아

*2024-10-09, version 2.5.4*

러시아

### 5/5 — 안드로이드 버전은 안나올까요? ㅠㅠ

*2024-03-31, version 2.5.3*

교사입니다. 
학생들과 학급 특색 활동으로 사용할 습관형성 어플을 칮고 있던 중 66 days를 발견하고 마음에 쏙들어 아이들에게 권했는데 아이들이 안드로이드에는 없다고 하더라고요. 그래서 다른 어플 엄청 찾아봤는데 마음에 쏙 드는 것은 이것 뿐입니다. ㅠㅠ 
안드로이드 버전도 만들어 주세요.. ㅠㅠ

### 5/5 — 간결한 ui , 함축적인 기능

*2024-03-02, version 2.5.2*

간결하면 리스트를 기록하기가 좋습니다.

### 5/5 — 아주 잘 사용하고 있습니다.

*2024-02-11, version 2.5.2*

습관 관리하기에 아주 좋습니다. 
인터페이스도 직관적이고 예쁩니다.

### 5/5 — 위젯

*2024-02-02, version 2.5.2*

달력모양으로 프로젝트별로 위젯 만들수 있으면 완벽할듯

### 5/5 — 습관만들기 최고의 앱 🤩..

*2024-01-29, version 2.5.2*

원래 리뷰 잘 안 쓰는데 다들 쓰셨으면 하는 마음에 리뷰 쓰고 갑니당 깔끔하고 정리가 잘 되어있고.. 그냥 최고입니다 지금까지 만족 못 한 앱만 수두룩이라 깔고 지우고를 반복했었는데 이 앱은 오랫동안 사용할 것 같아요 66일 습관 만들기 다같이 성공해봅시다!

### 2/5 — Can’t edit habits and no support

*2023-10-11*

Lives the idea of the app, but if you miss a day or accidentally enter an incorrect item, there is no way to change it.

I tried to connect support and got no reply - this is a no-go for me :/.

### 1/5 — Nicht nutzbar

*2023-05-01, version 2.4.1*

Die App lässt sich nach dem Herunterladen einmal öffnen und stürzest dann ab. Die App kann ich danach nicht mehr öffnen. Ich habe bereits probiert sie erneut zu installieren, dennoch habe ich immer wieder das gleich Problem. 
Ich hatte die App bereits früher und mochte sie sehr, dann kam mit dem neuen Update auch die Probleme mit. Ich finde es sehr schade.

## Frequently asked questions about 66 Days

### What is the core concept behind 66 Days?

The app is based on the principle that it takes an average of 66 days to build a new habit. It encourages consistent daily repetition of a behavior to make it automatic.

### Does 66 Days have ads?

No, 66 Days does not contain advertisements, offering an uninterrupted user experience.

### What are the subscription options for 66 Days?

66 Days offers monthly, 3-month, and yearly premium subscriptions, all including a 6-month free trial. Prices range from $1.49/month to $7.99/year.

### What devices is 66 Days compatible with?

66 Days is available on iPhone, iPad, and Apple Watch, allowing for habit tracking across multiple platforms.

### How often is 66 Days updated?

The app was last updated on October 21, 2025, indicating regular maintenance and potential feature additions.

### What is the age rating for 66 Days?

66 Days has an age rating of 4+, making it suitable for a wide range of users.

### Can I track multiple habits simultaneously in 66 Days?

Yes, you can set goals on a project-by-project basis, allowing you to form and track multiple habits concurrently.

### What kind of user feedback does 66 Days receive?

Based on the available data, 66 Days has a rating of 4.0 stars from 8 ratings, suggesting generally positive user sentiment.

## Version history (last 5 releases)

### 2.8.1 — 2026-09-01

• Personalized Card Backgrounds & Photo Editor
Add your favorite motivational photos to your habit cards. Effortlessly adjust position with drag, scale with pinch-to-zoom, and apply beautiful blur effects to create custom habit cards.

• Overhauled 'Break Bad Habits' Tracker
Stay motivated with intuitive milestone gauges that visualize your clean streaks. Easily record your reflections and thoughts whenever you overcome cravings.

• Faster & Smoother Performance
Enjoy instant check-in feedback, enhanced real-time data synchronization, and overall stability improvements.

Wishing you success on your 66-day journey!

### 2.7.0 — 2025-10-21

Now supports iOS 26 with the new Liquid Glass technology.
Enjoy a smoother and more refined interface experience.

### 2.6.0 — 2025-04-03

The small bug has been fixed.

### 2.5.4 — 2024-05-26

The small bug has been fixed.

### 2.5.3 — 2024-03-09

I've made some tweaks to the app, fixing minor bugs to ensure a smoother experience for you. Now, you can enjoy a more seamless and hassle-free usage!

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## More apps by Epipherse

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All apps by Epipherse: https://appshunter.io/developer/1231938524

## Related topics

[66 days](https://appshunter.io/ios/topics/66-days)

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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 2026-09-02.*