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.

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

"Transform your life with 21-day challenges to cultivate new habits. Choose from a variety of challenges, track your progress, earn points for customization, and journal daily for a healthier mind. Download now and start your journey to a happier self!"

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😊(142K 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

Track your daily habits, set goals, and monitor your progress with this handy habit-tracking app. Stay motivated and achieve your objectives easily. Start tracking today!

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 Private Limited
Free
💪 Health & Fitness
(0)
5
21 Day Fix® Tracker – Official
21 Day Fix® Tracker – Official
21 Day Fix® Tracker – Official
by Beachbody, LLC
Free

Track your nutrition, workouts, and progress effortlessly with this all-in-one app. Stay on top of your daily meals, water intake, workouts, and body measurements with ease. Take charge of your fitness journey today!

💪 Health & Fitness
(2.5K)
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

This fitness app helps users track their 21-day workout progress with a simple and intuitive interface, featuring tools such as a calorie calculator, BMI calculator, and streaks tracker. By downloading the app, users can easily monitor their progress, set reminders, and log their workouts, with the option to upgrade to a premium membership for extended features.

💪 Health & Fitness
(43)
8
I am - Daily Affirmations
I am - Daily Affirmations
I am - Daily Affirmations
Developpement personnel
Free

Experience daily affirmations with our app, designed to rewire your mindset with positive self-talk and empower you to reach your goals. Get started on a journey of self-discovery and resilience today. Subscribe for premium content and unlock the full potential of affirmations.

💪 Health & Fitness
(13K)
9
21 Day Fitness at Home
21 Day Fitness at Home
21 Day Fitness at Home
21 Day Challenge For Fitness
Free

Get fit and lose weight in just 21 days with a customizable at-home workout plan that requires no equipment and suits all fitness levels. Challenge yourself with easy-to-follow exercises, track progress, and achieve your goals with the help of a virtual fitness coach and personalized reminders.

📊 Productivity
(16)
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

Get in shape and lose weight with a home workout app offering 21-day training programs suitable for all fitness levels. Access 50 exercises designed by professional trainers to help you reach your fitness goals in just three weeks. Start your fitness journey today!

💪 Health & Fitness
(613)
11
21 Day Body Transformation
21 Day Body Transformation
21 Day Body Transformation
Weight Loss Workout Challenge
Free

Get back in shape with a 21-day weight loss workout challenge that includes daily bodyweight exercises to target key muscle groups, perfect for those looking to shed a little fat and boost their fitness. Follow this easy-to-use program from home and emerge stronger, faster, and more flexible in just 3 weeks.

💪 Health & Fitness
(5)
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

Get in shape with our 30-day home fitness program designed for men. Work out anytime, anywhere with personalized routines and progress tracking. Start your fitness journey today!

💪 Health & Fitness
(28K)
15
Productive - Habit Tracker
Productive - Habit Tracker
Productive - Habit Tracker
Daily Routine & Goals Planner
Free

Get on track with your daily routine using this app that helps you track and form good habits, set goals, and stay organized. Start your journey to a more productive life today!

📊 Productivity
(91K)
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
Morning Routines & ADHD Help
Free

Track your daily habits with ease using this personalized habit tracker. Stay motivated to complete your morning routines and achieve your goals effortlessly. Download now and start building better habits today!

💪 Health & Fitness
(13K)
18
Intermittent Fasting Tracker -
Intermittent Fasting Tracker -
Intermittent Fasting Tracker -
Fasting App: Lose Weight Fast
Free

An intuitive fasting app that guides you through various fasting plans to help you lose weight effectively and feel more active. With features like timers, statistics tracking, and personalized insights, it supports both beginners and experienced users on their fasting journey. Subscribe to access all features for personalized fasting experience.

💪 Health & Fitness
(28K)
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)

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