Best 21 Days Apps

233+ iOS apps curated and reviewed

4.1 avg rating
17 free apps
Updated September 2026

The best 21 days apps on iPhone average 4.1★ across 233+ titles — we've ranked them by what real users actually keep on their phones. Updated September 2026.

Compare top 21 Days Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1The 21 Days ChallengeThe 21 Days ChallengeFree4.7★ (543)YesYesSep 2026
221 Days21 DaysFreeNoYesJul 2026
3Explore 21 DaysExplore 21 DaysFreeNoNoSep 2026
421 Days - Be Your Best Self21 Days - Be Your Best SelfFreeYesNoMay 2026
521 days: Breakup Reset21 days: Breakup ResetFreeYesNoJun 2026
621 Days: Quit Bad Habits21 Days: Quit Bad HabitsFreeNoNoMay 2026
7Habit TrackerHabit TrackerFree4.8★ (145K)NoYesSep 2026
821 Days Sugar-Free21 Days Sugar-Free$0.99NoNoJul 2026

Top Picks for 21 Days

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
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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
  • 🌟 Inspirational and encouraging messages
  • 🌱 Helps build healthy routines

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
  • 🎨 App could use more customization options

More 21 Days apps to explore

FAQ about 21 Days

What are the best 21 days apps for iPhone?
The 21 Days Challenge tops our 21 days apps ranking as of September 2026, with a 4.7-star average from 543 App Store ratings, and it's free to download.
Yes — 17 of the top 21 days apps we rank are free to download, including The 21 Days Challenge and 21 Days.
The 21 Days Challenge shows ads and offers in-app purchases, according to its App Store listing as of September 2026.
We track 233+ 21 days apps on the iOS App Store as of September 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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