Best 21Days Apps

201+ iOS apps curated and reviewed

4.4 avg rating
18 free apps
Updated June 2026

From beginner-friendly picks to power-user tools, our 21days list covers 201+ iPhone apps updated through June 2026. Compare ratings, prices, and screenshots in one place.

Compare top 21Days Apps (June 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1The 21 Days ChallengeThe 21 Days ChallengeFree4.7★ (543)YesYesSep 2026
2Habit TrackerHabit TrackerFree4.8★ (145K)NoYesSep 2026
321 Days - Be Your Best Self21 Days - Be Your Best SelfFreeYesNoMay 2026
421 Days21 DaysFreeNoYesJul 2026
521 Day Fix® Tracker – Official21 Day Fix® Tracker – OfficialFree4.6★ (2.5K)NoNoSep 2026
621-Day Shape-Up Plan21-Day Shape-Up PlanFreeYesYesMay 2026
721 Day Container Workout Fix21 Day Container Workout FixFree4.1★ (43)NoYesMay 2026
8I am - Daily AffirmationsI am - Daily AffirmationsFree4.8★ (730K)YesYesSep 2026

Top Picks for 21Days

The 21 Days Challenge#1

The 21 Days Challenge by Kati Pereira

Introduce life changing habits
Editor's Choice
🌟 Lifestyle
4.7😊(543 ratings)
FreeAdsIn-App Purchases
The 21 Days Challenge screenshot 1
The 21 Days Challenge screenshot 2
The 21 Days Challenge screenshot 3
The 21 Days Challenge screenshot 4
The 21 Days Challenge screenshot 5
The 21 Days Challenge screenshot 6

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.

What We Love

  • 🚀 Simple and motivating
  • 👍 Clean design and clear progress tracking
  • 🤗 Genuinely helpful and enjoyable to use
  • 💫 Positive impact on mental health and habits

Room to Improve

  • 🔍 Lack of search option in community challenges
  • 🔀 Challenges disappear after creation, no way to find them
  • 🤖 Too many ads interrupting the experience
Habit Tracker#2

Habit Tracker by InnerGrow

Goal Tracker & ADHD Planner
Strong Contender
📊 Productivity
4.8😊(145K ratings)
FreeIn-App Purchases
Habit Tracker screenshot 1
Habit Tracker screenshot 2
Habit Tracker screenshot 3
Habit Tracker screenshot 4
Habit Tracker screenshot 5
Habit Tracker screenshot 6

This app helps you build lasting habits and achieve your goals through simple daily planning and routine tracking. It offers features like syncing with health data, group challenges, and insightful analytics to support your self-care and personal growth journey.

What We Love

  • 👍 Customizable and user-friendly interface
  • 🚀 Efficient and intuitive habit tracking
  • 💡 Comprehensive data visualization and progress tracking
  • 🔒 Secure and reliable app with no ads

Room to Improve

  • 🐛 Occasional bugs and glitches
  • 🔒 Lack of iCloud sync and cross-device support
  • 🔒 Limited free version with restricted features

More 21Days apps to explore

FAQ about 21Days

What are the best 21days apps for iPhone?
The 21 Days Challenge tops our 21days apps ranking as of June 2026, with a 4.7-star average from 543 App Store ratings, and it's free to download.
Yes — 18 of the top 21days apps we rank are free to download, including The 21 Days Challenge and Habit Tracker.
The 21 Days Challenge shows ads and offers in-app purchases, according to its App Store listing as of June 2026.
We track 201+ 21days apps on the iOS App Store as of June 2026, ranked by rating, recency, and analysis of real user reviews.
The 21 Days Challenge app helps users introduce and build life-changing habits over a 21-day period. It offers various challenges focused on health, productivity, happiness, and more. Users can track their progress, journal their experiences, and engage with a community.
The app offers a diverse range of challenges, including starting a healthy lifestyle, taking breaks from the internet, practicing gratitude, improving productivity, finding happiness and calm, studying effectively, spreading kindness, and fixing sleep schedules. It also includes daily positive affirmations.

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