21DaysOfChange vs 21
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
21DaysOfChange
Read full descriptionHide full description
With our clear guidance and a bit of fun, we'll help you transform your habits into something you can be proud of. Imagine growing a tree - starting small, nurturing it daily, and watching it flourish. In just 21 days, you'll cultivate a new habit with tips and strategies that will last a lifetime. Join us on this transformative journey and take control of your lifestyle, one habit at a time. Terms Of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.21daysofchange.app/privacypolicy
21
Read full descriptionHide full description
Boost your happinessβbacked by science Small actions can create big change. Happiness Challenge bundles five research-driven habits into one beautifully simple app and guides you through a 21-day journey to a happier, healthier you. The 5-Step Daily Formula 1. Gratitude Journal β Spend 2 minutes noting things youβre grateful for. 2. Meaningful Moment Journal β Reflect on one positive experience from the last 24 hours. 3. Thank-You Message β Strengthen relationships by sending a quick note of appreciation. 4. 15-Minute Cardio Burst β Elevate mood-boosting endorphins with movement you enjoy. 5. Mindful Meditation β Center yourself with a short meditation. Why youβll love it * One-Tap Tracking - Toggle each habit as you complete itβwatch your daily checklist glow. * 21-Day Streak Calendar - See at a glance which days youβve hit all five tasks and keep your streak alive. * Journals that Spark Joy - Beautiful, distraction-free spaces for gratitude and meaningful-moment entries. * Memories That Last - Browse past journal pages anytime to relive uplifting thoughts and wins. * Gentle Reminders - Custom notifications help you stay on course without the guilt trip. * Private & Secure - Your reflections are stored safely on your device. Start your happiness challenge today Download Happiness Challenge, commit just a few minutes a day, and feel the difference. Your happier self is 21 days awayβready to begin?
Screenshots
Verdict
The clearest difference is in-app purchases: 21 at none against 21DaysOfChange's 4. 21 also leads on update cadence (weekly vs every 9 months) and iOS requirement (12.0 vs 16.4). On price, ads and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. 21DaysOfChange sells 4 in-app purchases, starting at $4.99 per month. 21 asks for nothing beyond the download.
21DaysOfChange ships an update every 9 months, 21 weekly. The most recent releases landed on October 21, 2026 and October 12, 2026 respectively.
| Parameter | 21DaysOfChange | 21 |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 months | Weekly β better |
| Ads | No | No |
| In-app purchases | Yes | No β better |
| Devices | iPhone, iPad | iPhone, iPad, iPod β better |
| Requires iOS | 16.4 | 12.0 β better |
| Further details β not scored | ||
| Size | 59 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Hong Son Vu | Brogdon Co, LLC |
In-app purchases
21DaysOfChange
- 21DaysOfChange Monthly Premium$4.991 Month
- 21DaysOfChange Monthly Business$12.991 Month
- 21DaysOfChange Yearly Premium$34.991 Year
Show 1 moreShow fewer
- 21DaysOfChange Yearly Business$89.991 Year
21
No in-app purchases









