The 21 Days Challenge vs Kapper
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
The 21 Days Challenge
Build lasting habits and transform your life over 21 days with guided challenges. Track your progress, journal your thoughts, and customize your avatar with earned points. Discover new routines for health, productivity, and happiness.
- 21-day habit challenges
- Habit tracking
- Avatar customization
- Daily journaling
- Mood tracking
- Community feed
- Positive affirmations
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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/
Kapper
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Kapper is the fastest way to book your next haircut. Find your barbershop, see real availability, and book in seconds — no phone calls, no waiting for a reply, no double-booked slots. BOOK IN SECONDS • See each shop's services, prices, and real-time availability • Pick your barber, pick your time, confirm — that's it • Instant confirmation with reminders so you never miss a cut YOUR SHOPS, YOUR BARBERS • Save your favorite barbershops • See each barber's portfolio before you choose • Book with the same barber every time STAY ON TOP OF IT • All your upcoming and past appointments in one place • Reschedule or cancel without an awkward phone call • Add appointments to your calendar • Get notified when it's almost time Available in English, Spanish, and French. Sign in with Apple, Google, or email — and get back to looking sharp.
Screenshots
Verdict
The clearest difference is in-app purchases: Kapper at none against The 21 Days Challenge's 2. Kapper also leads on ads (none vs shown). On price, update cadence, 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
Both are free to download. The 21 Days Challenge sells 2 in-app purchases, starting at $2.99 per month. Kapper asks for nothing beyond the download.
Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.
| Parameter | The 21 Days Challenge | Kapper |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (568 ratings) — better | — |
| Positive reviews | 91.7% of reviews | — |
| Number of ratings | 568 — better | — |
| Update frequency | Monthly | Monthly |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 127 MB | 58 MB |
| Age rating | 4+ | 4+ |
| Developer | Kati Pereira | anass el moussaoui |
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
Kapper
Not enough reviews yet to summarise bugs or requests.
In-app purchases
The 21 Days Challenge
- Remove ads month$2.991 Month
- Remove Ads Year$24.991 Year
Kapper
No in-app purchases









