21 Days Challenge

Contains adsIn-app purchases
4.7
84K reviews
5M+
Downloads
Content rating
PEGI 3
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About this app

Create your ideal life with life-changing habits.
It is estimated that it takes people 21 days to form a new habit. So it’s a perfect amount of time to change or introduce something new in your life. Choose the best challenge for you (or create your own) and do it for 21 days and you’re going to see how the habit becomes part of your lifestyle day by day.

Starting a healthy lifestyle, taking a break away from the internet, practicing gratitude, learning a new language, trying to be more productive, finding happiness, self-help, how to study effectively, ways to spread kindness and positivity, tips for fixing your sleeping schedule, self-care practices, decluttering, being more confident, writing journal prompts and daily positive affirmations are some of the challenges that you can find in the app.
Basically, you can use this app as a habit tracker.

Once you complete your daily task, you can mark it as completed and collect the points (to customize your avatar, to unlock motivational reminders and free wallpapers).

In the gratitude challenge, you can write your thoughts and share them in the feed (it can be anonymous too). Here you're going to see all the community answers and you can also give it a like, comment, or send gifts to your favorite ones.

Create a healthier and happier mind with journaling. With this app, you can write a daily journal and choose your daily mood. Then you can track your mood in the calendar and see all your previous records.

There’s a selection of positive wallpapers for your phone and motivational reminders to share with your friends. Also, some relaxing music.

Enable notifications and choose the time to be notified to remind you to do the challenge every day.

You have all of this in one app for free!

Don’t forget to take care of your body and mind. It's the only place you have to live.

Your journey to self-improvement and better mental health starts today!
Updated on
Nov 28, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Personal info and Device or other IDs
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.7
82.2K reviews
LuhvlyL3na
May 21, 2025
This app definitely needs more recognition! It offers a wide range of challenges, all with a lovely, motivating design. The only downside is the occasional ad popup, but honestly, for what you get, it's a small price to pay. Definitely worth trying if you're into self-improvement.
17 people found this review helpful
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Faridullah Saqib
November 14, 2025
Dear 21 Days Team, I hope you are doing well. I really like your app, Days Challenge, and I use it regularly to build positive habits. I have a small suggestion that I believe would make the app even better: It would be very helpful if you could add an option that allows users to choose the number of challenge days themselves. For example, users could select a duration based on their personal goals, such as 21, 30, 60, 90 days, or any number they prefer. Many users, including myself, sometime
2 people found this review helpful
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B. Yesui
November 23, 2025
I’ve been using this app for about four years now, and it has genuinely supported me through so many different moments in life. The daily reminders are always so perfectly timed that it often feels like the app understands exactly what I need to hear. I don’t use the habit features as much anymore, but the reminders alone are enough reason for me to keep it. Thank you to the team for creating something so thoughtful and helpful.
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What’s new

Performance improvements.

This is the beginning of anything you want <3