Best 21 Days Apps

234+ iOS apps curated and reviewed

4.4 avg rating
18 free apps
Updated October 2026

The best 21 days apps on iPhone average 4.4★ across 234+ titles — we've ranked them by what real users actually keep on their phones. Updated October 2026.

Compare top 21 Days Apps (October 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1The 21 Days ChallengeThe 21 Days ChallengeFree4.7★ (543)YesYesOct 2026
221 Days21 DaysFree—NoYesSep 2026
3Habit TrackerHabit TrackerFree4.8★ (148K)NoYesOct 2026
421 Days - Be Your Best Self21 Days - Be Your Best SelfFree—YesNoMay 2026
521 Day Fix® Tracker – Official21 Day Fix® Tracker – OfficialFree4.6★ (2.5K)NoNoSep 2026
621 days: Breakup Reset21 days: Breakup ResetFree—YesNoJun 2026
721 Days: Quit Bad Habits21 Days: Quit Bad HabitsFree—NoNoMay 2026
821 Days Sugar-Free21 Days Sugar-Free$0.99—NoNoSep 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
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
  • 🌟 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#3

Habit Tracker by InnerGrow

Goal Tracker & ADHD Planner
Worth Considering
📊 Productivity
4.8😊(148K 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
  • 💰 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 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 October 2026, with a 4.7-star average from 543 App Store ratings, and it's free to download.
Yes — 18 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 October 2026.
We track 234+ 21 days apps on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.

Related searches