Best The 21 Days Challenge Apps

203+ iOS apps curated and reviewed

4.5 avg rating
18 free apps
Updated October 2026

If you already know The 21 Days Challenge, this is the deeper bench. 203+ the 21 days challenge apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of October 2026.

Compare top The 21 Days Challenge Apps (October 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1The 21 Days ChallengeThe 21 Days ChallengeFree4.7★ (575)YesYesNov 2026
2Habit TrackerHabit TrackerFree4.8★ (148K)NoYesNov 2026
321 Days - Habit Tracker21 Days - Habit TrackerFree—NoYesOct 2026
4Be fit 21 - Home workout appBe fit 21 - Home workout appFree4.7★ (617)NoYesOct 2026
521 Day Fix® Tracker – Official21 Day Fix® Tracker – OfficialFree4.6★ (2.5K)NoNoOct 2026
621 Day Fitness at Home21 Day Fitness at HomeFree3.9★ (17)YesYesOct 2026
721 Days Habit Transformation21 Days Habit TransformationFree—NoYesOct 2026
821 Days – AI Challenge21 Days – AI Challenge$0.99—NoNoOct 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😊(575 ratings)
FreeAdsIn-App Purchases
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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
Habit Tracker#2

Habit Tracker by InnerGrow

Goal Tracker & ADHD Planner
Strong Contender
📊 Productivity
4.8😊(148K ratings)
FreeIn-App Purchases
Habit Tracker screenshot 1
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Habit Tracker screenshot 6

This app helps you build lasting habits and achieve your goals with a simple daily planner. It offers features like syncing with Apple Health, group habit tracking, and insightful analytics to monitor your progress and well-being.

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
  • 💰 Affordable one-time premium purchase option

Room to Improve

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

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 October 2026, with a 4.7-star average from 575 App Store ratings, and it's free to download.
Yes — 18 of the top the 21 days challenge 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 October 2026.
We track 203+ the 21 days challenge apps on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.