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★ (499)YesYesJul 2026
2Habit TrackerHabit TrackerFree4.8★ (144K)NoYesJul 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)NoNoJul 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 - 매일하는 자기 확언I am - 매일하는 자기 확언Free4.8★ (722K)YesYesJul 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😊(499 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😊(144K ratings)
FreeIn-App Purchases
#78in Productivity
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

4
21 Days
21 Days
21 Days
by iLoma Technology
Free
💪 Health & Fitness
(0)
5
21 Day Fix® Tracker – Official
21 Day Fix® Tracker – Official
21 Day Fix® Tracker – Official
by Beachbody, LLC
Free

Easily monitor your nutrition and workouts with this official tracker. Log colored containers for meals, track water intake, and access daily workout plans. Monitor progress with body measurements and maintain your results with a dedicated maintenance mode.

Nutrition tracking with colored containersDaily workout plan accessWater intake monitoring
💪 Health & Fitness
(2.5K)
free
6
21-Day Shape-Up Plan
21-Day Shape-Up Plan
21-Day Shape-Up Plan
Shape-Up Workout Plan at Home
Free
💪 Health & Fitness
(0)
7
21 Day Container Workout Fix
21 Day Container Workout Fix
21 Day Container Workout Fix
Track your 21 day workout easy
Free

Easily track your 21-day workout progress with this intuitive fitness app. It replaces paper calendars, offers a calorie calculator, BMI tracking, and photo logging to monitor your transformation. Stay motivated with reminders and custom graphs.

Ad-free trackingCalorie calculatorBMI calculator
💪 Health & Fitness
(43)
freemium
8
I am - 매일하는 자기 확언
I am - 매일하는 자기 확언
I am - 매일하는 자기 확언
모티베이션그리고명언
Free

This app helps you rewire your brain and build self-esteem through positive daily affirmations. Choose from various intentions and set reminders to cultivate a more resilient and positive mindset.

Daily affirmationsRewire negative thoughtsBuild self-esteem
💪 Health & Fitness
(722K)
free with in-app purchases
9
21 Day Fitness at Home
21 Day Fitness at Home
21 Day Fitness at Home
21 Day Challenge For Fitness
Free

This app offers a 21-day fitness challenge designed for women, providing at-home workouts without equipment. It features customizable plans, progress tracking, and voice-guided coaching to help users achieve their fitness and weight loss goals.

21-day fitness and weight loss challengeNo equipment home workoutsCustomizable training plans
📊 Productivity
(17)
free with in-app purchases
10
Be fit 21 - Home workout app
Be fit 21 - Home workout app
Be fit 21 - Home workout app
Lose weight in 21 days
Free

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.

Home workoutsWeight loss programsMuscle toning exercises
💪 Health & Fitness
(613)
free with in-app purchases
11
21 Day Body Transformation
21 Day Body Transformation
21 Day Body Transformation
Weight Loss Workout Challenge
Free

This program offers a 3-week fitness plan with daily bodyweight workouts to help users lose fat and build strength. It's designed for home use and requires minimal daily exercises.

21-day fitness planDaily bodyweight workoutsTargeted muscle group exercises
💪 Health & Fitness
(5)
free with in-app purchases
12
21 Days – AI Challenge
21 Days – AI Challenge
21 Days – AI Challenge
AI-powered challenge tracker
$0.29
$2.49 | 88% OFF
🌟 Lifestyle
(0)
13
21 Days: Quit Bad Habits
21 Days: Quit Bad Habits
21 Days: Quit Bad Habits
by GIZEM CEVIK
Free
🌟 Lifestyle
(0)
14
30 Day Fitness at Home
30 Day Fitness at Home
30 Day Fitness at Home
Home Workout for Women To Burn
Free

Achieve weight loss and muscle gain with personalized home workout plans and professional guides. This app offers a variety of exercises and customized routines, with an AI trainer to answer your fitness questions. See results in 30 days with zero equipment needed.

Personalized workout plansZero-equipment home workoutsAI fitness trainer
💪 Health & Fitness
(28K)
subscription
15
Трекер привычек - Productive
Трекер привычек - Productive
Трекер привычек - Productive
Привычки, цели и напоминания
Free

Build positive habits and achieve your goals with this comprehensive planner. Track progress, engage in challenges, and gain insights to enhance your productivity and well-being.

Habit creation and managementPersonalized goal programsGuided challenges
📊 Productivity
(91K)
freemium
16
21 Days Habit Transformation
21 Days Habit Transformation
21 Days Habit Transformation
Daily Routine & Goals Planner
Free
$5.99 | 100% OFF
💪 Health & Fitness
(0)
17
Fabulous: Daily Habit Tracker
Fabulous: Daily Habit Tracker
Fabulous: Daily Habit Tracker
Healthy Routines & Motivation
Free

Build healthy habits and routines to improve your life and mental well-being. This app offers daily coaching, journaling, and community support to help you achieve your goals.

Daily habit trackingMorning and evening routinesSelf-improvement coaching
💪 Health & Fitness
(88K)
free with in-app purchases
18
Intermittent Fasting Tracker -
Intermittent Fasting Tracker -
Intermittent Fasting Tracker -
Easy Fast Timer, Lose Weight
Free

This app helps users achieve sustainable weight loss and health goals through personalized intermittent fasting plans and an AI-powered calorie counter. It offers features like food scanning, hydration tracking, and detailed progress monitoring. Users can access science-based insights and healthy recipes to support their journey.

Personalized fasting plansAI calorie counter and food loggerWater and hydration tracker
💪 Health & Fitness
(29K)
freemium
19
21 Day Challenge
21 Day Challenge
21 Day Challenge
by Phanupong Sanmee
Free
🌟 Lifestyle
(0)
20
21Days: Build Habits
21Days: Build Habits
21Days: Build Habits
Build habits in 21 days
$1.99
💪 Health & Fitness
(0)

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 499 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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