Great app!
I like how simple and forward the app is. Perfectly designed for practical daily use. I’ve experimented with a lot of apps and this one has helped me the most by far. I refuse to restart the streak. Great app.
Archived App (Last seen on 16 Dec 2025)
This is an archived listing of the app previously available on the App Store.Although the app is no longer distributed by Apple, you can still view its description, screenshots, version history, ratings, and metadata for reference.
About
This app helps you build new habits or break old ones by encouraging you to commit to a goal for 21 consecutive days. Track your progress, set reminders, and visualize your transformation with a calendar view and custom avatars.
✓21-day habit formation
✓Goal setting and tracking
✓Replace bad habits with good ones
✓Customizable reminders
✓Calendar progress visualization
✓Avatar creation
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What's New in 21 Days Challenge
1.1
May 30, 2021
Notification on Remind Time
User reviews
Developer apps
FAQ
What is the core concept behind 21 Days Challenge?
The app is based on the psychological principle that it takes approximately 21 days to form or break a habit. It encourages users to commit to a new behavior or quit an old one for this duration to establish lasting change.
How does 21 Days Challenge help users track progress?
Users can mark their daily progress as completed or restart if they miss a day. The app features a calendar view that visually represents the user's streak and overall progress towards their 21-day goal.
Can 21 Days Challenge be used to quit bad habits?
Yes, the app is designed to help users replace old, undesirable habits with new, positive ones. Users can set a bad habit they wish to quit and then focus on building a new habit to replace it over the 21-day period.
What kind of reminders does 21 Days Challenge offer?
The app provides powerful and flexible reminders with customizable scheduling options. These reminders help users stay on track with their chosen habits and goals throughout the 21-day challenge.
Does 21 Days Challenge have ads?
No, 21 Days Challenge is ad-free, providing an uninterrupted user experience focused on habit formation and personal growth.
What devices is 21 Days Challenge available on?
21 Days Challenge is available for iPhone and iPod devices, indicated by its supported devices list.
How often is 21 Days Challenge updated?
The app was last updated on May 30, 2021, with version 1.1. This suggests a moderate update frequency, with the developer actively maintaining the application.
What is the age rating for 21 Days Challenge?
21 Days Challenge has an age rating of 4+, making it suitable for a wide range of users interested in self-improvement.