# 3weeks -plan habit, goal, life — Make habits, change lifestyle.

> Habit building planner based on 21-day repetition principle. (iPhone/iPad app by SunHyeob Kim.)

- Source: https://appshunter.io/ios/app/3weeks-plan-habit-goal-life/id1473374528 (this page in markdown: same URL + `.md`)
- Developer: [SunHyeob Kim](https://appshunter.io/developer/946982071)
- Category: Productivity, Lifestyle
- Price: Free
- Rating: 4.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 14.0 · 63 MB
- Languages: English
- Released: 2019-07-31
- Data updated: 2026-07-07
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/3weeks-plan-habit-goal-life/id1473374528/reviews.md

## What is 3weeks?

Just 21 days can change your life.

Have you ever started a new habit with full motivation, only to give up a few days later? Diet plans abandoned, workout routines forgotten, study schedules ignored. If this sounds familiar, you are not alone — and it is not your fault. The problem is not willpower. The problem is not having the right system.

Science has proven it: it takes a minimum of 21 days of consistent repetition for a new behavior to become hardwired into the brain as a habit. Just 3 weeks. Repeat an action every single day for 21 days, and it stops feeling like effort — it becomes a natural part of your life. 3weeks is a habit-building planner app built on exactly this principle.


[ Why 3weeks Is Different ]

There are plenty of habit apps out there. 3weeks is not just another checklist. It is a motivation system engineered to keep you going for the full 21 days — and beyond.


- 21-Day Challenge System

The moment you add a habit, your 21-day countdown begins. Did you do it today? One tap to check in and your progress is recorded. Simple, powerful, and designed to rewire your brain one day at a time.


- Streak Tracking That Keeps You Hooked

There is something deeply satisfying about watching your streak grow. Day 3, day 7, day 14 — as the number climbs, so does your confidence. You will find yourself not wanting to break the chain. That psychological pull is one of the most effective tools for building lasting habits, and it is built right into 3weeks.


- Log Your Day, Every Day

When you check in, record how you felt and rate your performance. Attach a photo or video — a selfie after your workout, a snapshot of your study notes, a picture of your healthy meal. These small records stack up into a personal timeline of growth. Looking back weeks later and seeing how far you have come is one of the most powerful motivators there is.


- Earn Badges, Celebrate Your Progress

Complete 7 days in a row and earn the Sprout badge. Finish all 21 days and unlock the Flame badge. Push further to 60 or 90 days for even rarer achievements. Check in before 6 AM and you are an Early Bird. Document your journey with photos and become a Documenter. These small, tangible rewards make the habit-building process genuinely enjoyable.


- See Your Growth in Stats and Charts

The calendar view shows your check-in history at a glance. Weekly pattern graphs, mood trend charts, average achievement rates — all in one place. Seeing your progress as real data makes the next challenge feel achievable and gives you the confidence to keep going.


- Smart Reminders So You Never Forget

Set a daily notification at the time that works best for you. That one alert at the same time every day is often all it takes to lock in your routine. Routine builds habit. Habit builds the life you want.


[ Who 3weeks Is For ]

Anyone who has tried to diet but quit after the first week. Anyone who wants to build a consistent workout routine. Students and professionals who need a daily study schedule. Anyone pursuing self-development through reading, meditation, or language learning. Those preparing for certifications, job applications, or career changes. Anyone trying to break a bad habit like smoking, drinking, or late-night snacking. People who want to become morning persons. Those who want to start small — drinking more water, stretching every day, writing in a journal.

Whatever your goal, whatever your habit, 3weeks gives you the structure to make it stick.


[ Your 21-Day Story Starts Today ]

Day one: you add your first habit with a sense of possibility.
Week one: your streak is building and your first badge appears.
Week two: you feel the shift — this time is different.
Day 21: you have done it. The badge is yours. And so is the habit.

Three weeks is not a long time. But it is exactly long enough to change everything. The single habit you start today could look completely different one year from now.

## Key features

- 21-Day Challenge System
- Streak Tracking
- Daily Logging with Photos/Videos
- Gamified Badges and Achievements
- Progress Stats and Charts
- Smart Reminders


## Frequently asked questions about 3weeks

### How does 3weeks help build habits?

3weeks utilizes a 21-day challenge system where consistent daily check-ins are tracked. This repetition aims to hardwire new behaviors into your brain, making them feel less like effort and more like a natural part of your life.

### Does 3weeks have ads?

Yes, 3weeks contains advertisements. As a free application, ads are displayed to support its development and maintenance.

### What kind of progress tracking does 3weeks offer?

3weeks provides a calendar view of your check-in history, weekly pattern graphs, mood trend charts, and average achievement rates. You can also log your day with photos or videos to create a visual timeline of your growth.

### Can I set reminders in 3weeks?

Yes, 3weeks offers smart reminders that you can set for a specific time each day. This daily notification helps lock in your routine, which is crucial for habit formation.

### What are the badges in 3weeks?

Badges are earned for reaching milestones, such as completing 7 days in a row (Sprout badge) or finishing a full 21-day challenge (Flame badge). There are also rarer achievements for longer streaks and specific actions like documenting your journey with photos.

### What devices is 3weeks available on?

3weeks is available on iPhone, iPad, and iPod. It is designed for iOS devices.

### How often is 3weeks updated?

The latest version is 1.2.0, and the app was last updated on June 22, 2026. This indicates a recent update, suggesting ongoing development and support.

### What is the age rating for 3weeks?

3weeks has an age rating of 4+. This means it is considered suitable for children aged 4 and older.

## Version history (last 5 releases)

### 1.2.2 — 2026-06-27

Streak Protection Improvements

A warning dialog now appears when checking in after missing a day
Choose to use a Streak Freeze, watch an ad to earn one, or restart your streak
Freeze count updates instantly on the home screen after use
Bug Fixes

Fixed an issue where the freeze count didn't update after use
Fixed an issue where check-in was allowed without warning after missing a day

### 1.2.0 — 2026-06-22

v1.2.0 Update

- Multi-language support added: the app is now available in Korean, English, Japanese, Chinese, and German. Switch anytime in Settings > Language.
- Login screen improved: app logo is now displayed and screen transitions are smoother.
- Fixed a layout issue on the Badge Collection screen.
- General stability and usability improvements.

### 1.1.3 — 2023-05-01

scroll bug fixing.

### 1.1.2 — 2021-04-28

Fix minor bug and Reduce the percent of main full screen ads.
Change App icon and colors.

### 1.1.1 — 2021-01-29

1. Fix the completion to user have to check the habit for 21 days streaky.
2. You can write reward text for yourself when creating a habit.
3. You can record a voice when creating a habit.
4. You can check a procedure for today.

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## More apps by SunHyeob Kim

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All apps by SunHyeob Kim: https://appshunter.io/developer/946982071

## Related topics

[3weeks](https://appshunter.io/ios/topics/3weeks)

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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 2026-07-07.*