Best The 21 Days Challenge Apps

198+ iOS apps curated and reviewed

4.6 avg rating
19 free apps
Updated September 2026

If you already know The 21 Days Challenge, this is the deeper bench. 198+ the 21 days challenge apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of September 2026.

Compare top The 21 Days Challenge Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1The 21 Days ChallengeThe 21 Days ChallengeFree4.7★ (543)YesYesSep 2026
221 Days21 DaysFreeNoYesJul 2026
3Be fit 21 - Home workout appBe fit 21 - Home workout appFree4.6★ (613)NoYesAug 2026
4Habit TrackerHabit TrackerFree4.8★ (145K)NoYesSep 2026
521 Day Fitness at Home21 Day Fitness at HomeFree3.9★ (17)YesYesAug 2026
621 Days Habit Transformation21 Days Habit TransformationFree was $5.99NoYesAug 2026
721 Day Fix® Tracker – Official21 Day Fix® Tracker – OfficialFree4.6★ (2.5K)NoNoSep 2026
8PEAK 75 hard challenge trackerPEAK 75 hard challenge trackerFree5.0★ (5)NoNoSep 2026

Top Picks for The 21 Days Challenge

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
Be fit 21 - Home workout app#3

Be fit 21 - Home workout app by Denis Vasyanin

Lose weight in 21 days
Worth Considering
💪 Health & Fitness
4.6(613 ratings)
FreeIn-App Purchases
Be fit 21 - Home workout app screenshot 1
Be fit 21 - Home workout app screenshot 2
Be fit 21 - Home workout app screenshot 3
Be fit 21 - Home workout app screenshot 4

This app offers home workouts designed to help users lose weight, build muscle, and improve overall fitness. It features 50 exercises across three difficulty levels, with programs structured over 21 days to build consistent habits.

More The 21 Days Challenge apps to explore

FAQ about The 21 Days Challenge

What are the best the 21 days challenge apps for iPhone?
The 21 Days Challenge tops our the 21 days challenge apps ranking as of September 2026, with a 4.7-star average from 543 App Store ratings, and it's free to download.
Yes — 19 of the top the 21 days challenge 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 198+ the 21 days challenge 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.