Comparison

The 21 Days Challenge vs YELW

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

The 21 Days Challenge

Build life-changing habits with guided 21-day challenges. Track progress, journal your thoughts, and customize your avatar with earned points. Improve your mental well-being and create a happier lifestyle.

Highlights
  • Guided 21-day habit challenges
  • Daily journaling and mood tracking
  • Avatar customization with earned points
  • Community feed for gratitude sharing
  • Positive affirmations and wallpapers
  • Daily task completion tracking
  • Customizable daily reminders
Features
Read full description

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 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, trying to be more productive, simple practices to find happiness and calm in your life, how to study effectively for all the students, ways to spread kindness and positivity, tips for fixing your sleeping schedule and daily positive affirmations are some of the challenges that you can find in the app. Once you complete your daily task, you can mark as completed and collect the points (to customize your avatar). This way, you can use this app like a habit tracker. In the gratitude challenge, you can write your thoughts and share them in the feed (you can leave anonymously too). Here you're going to see all the community answers and you can also give it a like on your favorite ones. Complete tasks on your profile and do daily challenges to collect points so you can buy items for your own avatar like different hairstyles, eyes and mouth shapes and clothes. Create a healthier and happier mind with journaling. With this app you can daily journal and choose your daily mood. Then you can track your mood in the calendar and see all your previous records. You also a have a selection of positive wallpapers for your phone. Enable notifications and choose the time to be notified to remind you to do the challenge every day. Don’t forget to take care of your body and mind. It's the only place you have to live. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

YELW

Read full description

YELW brings your whole self together — Body, Soul, and Spirit — into one calm daily rhythm, with an AI companion that knows your goals, your mood, and your faith journey. - Body — gentle, personalized movement & wellbeing plans and simple habits. - Soul — mood check-ins, private journaling, gratitude, and caring reflection. - Spirit — a daily devotional, Scripture, a Faith Q&A, and a private, judgment-free Safe-Doubt space. - Companion — a warm guide for the whole day, grounded and encouraging. Built for young people, with care: your journal and Safe-Doubt conversations are encrypted and private — never seen by guardians, leaders, or other users. Accounts for minors are private by default. YELW is not a medical or crisis service; when it matters, it points you to free, real human help. Available in English and Arabic (full right-to-left support).

Screenshots

The 21 Days Challenge4 screens
YELW4 screens

Verdict

The call

The clearest difference is in-app purchases: YELW at none against The 21 Days Challenge's 2. YELW also leads on ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. The 21 Days Challenge sells 2 in-app purchases, starting at $2.99 per month. YELW asks for nothing beyond the download.

Scorecard2 real differences · 8 level
The 21 Days Challenge versus YELW: the parameters behind the verdict, then further details
ParameterThe 21 Days ChallengeYELW
PriceFreeFree
Rating4.7 (576 ratings) — better—
Positive reviews92.1% of reviews—
Number of ratings576 — better—
Update frequencyEvery 3 weeks—
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better16.4
Further details — not scored
Size128 MB23 MB
Age rating4+4+
DeveloperKati PereiraThe First Model

Bugs and requests

The 21 Days Challenge

Reported bugs

2 issues
  • Sharing created challenges does not work as expected
  • Challenges sometimes disappear from the app

Requested features

4 requests
  • Add a search function for community challenges
  • Allow users to save and revisit their own created challenges
  • Provide more customization options for the app and user profile
  • Introduce a widget for easier access to daily tasks

YELW

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

The 21 Days Challenge

Subscriptions2
  • Remove ads month$2.991 Month
  • Remove Ads Year3 Days trial$24.991 Year
None

YELW

No in-app purchases

Questions

Is The 21 Days Challenge free?
The 21 Days Challenge is free to download, with in-app purchases available.
Is YELW free?
YELW is free to download, with no in-app purchases.
Do The 21 Days Challenge or YELW have ads?
The 21 Days Challenge shows ads; YELW does not.

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