Comparison

21DaysOfChange vs 21

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

Head to head
About

21DaysOfChange

Features
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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

About

21

Features
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Boost your happinessβ€”backed 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 – Spend 2 minutes noting things you’re grateful for. 2. Meaningful Moment Journal – Reflect on one positive experience from the last 24 hours. 3. Thank-You Message – Strengthen relationships by sending a quick note of appreciation. 4. 15-Minute Cardio Burst – Elevate mood-boosting endorphins with movement you enjoy. 5. Mindful Meditation – Center yourself with a short meditation. Why you’ll love it * One-Tap Tracking - Toggle each habit as you complete itβ€”watch your daily checklist glow. * 21-Day Streak Calendar - See at a glance which days you’ve 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 awayβ€”ready to begin?

Screenshots

21DaysOfChange4 screens
214 screens

Verdict

The call

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. 21DaysOfChange sells 4 in-app purchases, starting at $4.99 per month. 21 asks for nothing beyond the download.

UpkeepUpdate frequency

21DaysOfChange ships an update every 9 months, 21 weekly. The most recent releases landed on October 21, 2026 and October 12, 2026 respectively.

Scorecard3 real differences Β· 3 level
21DaysOfChange versus 21: the parameters behind the verdict, then further details
Parameter21DaysOfChange21
PriceFreeFree
Update frequencyEvery 9 monthsWeekly β€” better
AdsNoNo
In-app purchasesYesNo β€” better
DevicesiPhone, iPadiPhone, iPad, iPod β€” better
Requires iOS16.412.0 β€” better
Further details β€” not scored
Size59 MB23 MB
Age rating4+4+
DeveloperHong Son VuBrogdon Co, LLC

In-app purchases

4 purchases

21DaysOfChange

Subscriptions4
  • 21DaysOfChange Monthly Premium$4.991 Month
  • 21DaysOfChange Monthly Business$12.991 Month
  • 21DaysOfChange Yearly Premium$34.991 Year
Show 1 more
  • 21DaysOfChange Yearly Business$89.991 Year
None

21

No in-app purchases

Questions

Is 21DaysOfChange free?
21DaysOfChange is free to download, with in-app purchases available.
Is 21 free?
21 is free to download, with no in-app purchases.
Do 21DaysOfChange or 21 have ads?
Neither 21DaysOfChange nor 21 shows ads.
Which is updated more often, 21DaysOfChange or 21?
21DaysOfChange ships an update every 9 months, and 21 weekly. Most recently, 21DaysOfChange was updated on October 21, 2026 and 21 on October 12, 2026.

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