1. Home
  2. Topics
  3. 21 Days

Best 21 Days Apps

202+ iOS apps curated and reviewed

4.5 avg rating
19 free apps
Updated July 2026

The best 21 days apps on iPhone average 4.5★ across 202+ titles — we've ranked them by what real users actually keep on their phones. Updated July 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😊(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 Inner Grow Limited

Goal Tracker & ADHD Planner
Strong Contender
📊 Productivity
4.8😊(143K ratings)
FreeIn-App Purchases
#82in 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
21 Day Fix® Tracker – Official#3

21 Day Fix® Tracker – Official by Beachbody, LLC

Worth Considering
💪 Health & Fitness
4.6😐(2.5K ratings)
Free
21 Day Fix® Tracker – Official screenshot 1
21 Day Fix® Tracker – Official screenshot 2

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.

What We Love

  • 💻 Simple and easy to use
  • 📋 Convenient way to track containers
  • 🍽️ Helpful food lists for each container
  • 🔍 Allows you to see where you are in the program

Room to Improve

  • 🐛 App crashes or freezes frequently
  • 🔢 Unable to enter decimal values for weight/measurements
  • 💤 Lack of progress tracking across multiple rounds

More 21 Days apps to explore

4
21 Days
21 Days
21 Days
by iLoma Technology Private Limited
Free
💪 Health & Fitness
(0)
5
21 Days - Be Your Best Self
21 Days - Be Your Best Self
21 Days - Be Your Best Self
by Musa Mustafa
Free
💪 Health & Fitness
(0)
6
I am - Daily Affirmations
I am - Daily Affirmations
I am - Daily Affirmations
Developpement personnel
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
(720K)
free with in-app purchases
7
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
8
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
9
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
10
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)
11
Productive - Habit Tracker
Productive - Habit Tracker
Productive - Habit Tracker
Daily Routine & Goals Planner
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
12
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
(16)
free with in-app purchases
13
Fabulous: Daily Habit Tracker
Fabulous: Daily Habit Tracker
Fabulous: Daily Habit Tracker
Morning Routines & ADHD Help
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
14
AppBlock: Block Apps & Website
AppBlock: Block Apps & Website
AppBlock: Block Apps & Website
App Blocker. Limit Screen Time
Free

This app helps you regain control of your digital life by blocking distracting applications and websites. It offers customizable schedules and strict modes to reduce screen time, improve focus, and support healthier digital habits.

Block distracting appsBlock time-wasting websitesControl screen time
📊 Productivity
(6.2K)
free with in-app purchases
15
21Days: Build Habits
21Days: Build Habits
21Days: Build Habits
Build habits in 21 days
$1.99
💪 Health & Fitness
(0)
16
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
17
21 Days Habit Transformation
21 Days Habit Transformation
21 Days Habit Transformation
Daily Routine & Goals Planner
Free
$5.99 | 100% OFF
💪 Health & Fitness
(0)
18
21 Day Challenge
21 Day Challenge
21 Day Challenge
by Phanupong Sanmee
Free
🌟 Lifestyle
(0)
19
Gratitude: Self-Care Journal
Gratitude: Self-Care Journal
Gratitude: Self-Care Journal
Affirmations and Vision Board
Free

This self-care app helps improve mental health with a private gratitude journal, positive affirmations, and vision boards. It offers daily motivation, prompts, and the ability to record voice entries and add photos to your journal.

Gratitude journal with photo and voice entryHundreds of positive affirmationsCreate multiple vision boards
💪 Health & Fitness
(45K)
free with in-app purchases
20
Intermittent Fasting Tracker -
Intermittent Fasting Tracker -
Intermittent Fasting Tracker -
Fasting App: Lose Weight Fast
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
(28K)
freemium

Related searches

the 21 days challenge21 days habit transformation21 days metabolic diet21 days sugar-free21 days - be your best self21 days – ai challenge21 days challenge21 days: quit bad habitsgoal to habit in 21 days