The 21 Days Challenge vs Permission Zero
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/
Permission Zero
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Permission Zero – Only What Matters. With Those Who Matter. Permission Zero is your AI-powered success partner, designed to protect your time, sharpen your focus, and keep you accountable—effortlessly. Eliminate distractions and work only on what truly matters. Stay connected with those who genuinely care about you. Achieve your goals with AI-driven accountability and intelligent scheduling. Build better habits for a balanced and fulfilling life. Take control of your time and unlock your full potential. Download Permission Zero today!
Screenshots
Verdict
The clearest difference is in-app purchases: Permission Zero at none against The 21 Days Challenge's 2. Permission Zero also leads on ads (none vs shown) and update cadence (weekly vs monthly). 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
Both are free to download. The 21 Days Challenge sells 2 in-app purchases, starting at $2.99 per month. Permission Zero asks for nothing beyond the download.
The 21 Days Challenge ships an update monthly, Permission Zero weekly. The most recent releases landed on October 25, 2026 and October 20, 2026 respectively.
| Parameter | The 21 Days Challenge | Permission Zero |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (568 ratings) — better | — |
| Positive reviews | 91.7% of reviews | — |
| Number of ratings | 568 — better | — |
| Update frequency | Monthly | Weekly — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 127 MB | 183 MB |
| Age rating | 4+ | 4+ |
| Developer | Kati Pereira | Mosaic Singularity |
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
Permission Zero
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
Permission Zero
No in-app purchases
Questions
Is The 21 Days Challenge free?
Is Permission Zero free?
Do The 21 Days Challenge or Permission Zero have ads?
Which is updated more often, The 21 Days Challenge or Permission Zero?
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