3weeks -plan habit, goal, life
Make habits, change lifestyle.
Free · Designed for iPad. Not verified for macOS.
Now available in Korean, English, Japanese, Chinese, and German! Switch languages anytime in Settings. Your 21-day habit challenge, wherever you are in the world.
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.
Ratings & Reviews
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
The developer, SunHyeob Kim, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Search History
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Search History
- Browsing History
- Identifiers
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- SunHyeob Kim
- Size
- 66.4 MB
- Category
- Productivity
- Compatibility
Requires iOS 14.0 or later.
- iPhone
Requires iOS 14.0 or later. - iPad
Requires iPadOS 14.0 or later. - iPod touch
Requires iOS 14.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2023 CodeInCode Inc.