# 21 Days Challenge - Habit App

> Changing habits is a battle, and picking up the right tool is a battle half won.

Canonical page: [https://chrome-stats.com/d/com.deviation.twenty\_one\_days](https://chrome-stats.com/d/com.deviation.twenty_one_days)

## Overview

- **ID:** `com.deviation.twenty_one_days`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** DeviationApps
- **Category:** PRODUCTIVITY
- **Downloads:** 113,406
- **Rating:** 3.89 / 5 (240 ratings)
- **Version:** 1.3.1
- **Last updated:** 2023-10-29
- **First published:** 2019-08-12
- **Publisher country:** IN
- **Size:** 21 MB
- **Data as of:** 2026-09-07
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.deviation.twenty_one_days)
- **Privacy policy:** [https://21dayschallenge.app/privacy-policy](https://21dayschallenge.app/privacy-policy)

## Description

### 21 Days Challenge - Habit App

Transform your lifestyle by building new positive habits and breaking old bad ones with the 21 Days Challenge app. Based on scientific research and psychology, it takes about 21 days to form or replace a habit. This app helps you stay motivated and on track by allowing you to set goals, schedule reminders, and visually monitor your progress on a calendar. Whether you want to quit smoking, eat clean, exercise daily, or start journaling, this tool supports your journey to lasting change.

**Key Features:**
- Add and track new habits with ease.
- Replace unwanted habits by adopting healthier alternatives.
- Set powerful, flexible reminders to stay consistent.
- Visual calendar to see your streak and progress.
- Customize your avatar as a symbol of your lifestyle transformation.
- Animations to motivate and engage you along the way.

Start your 21-day transformation and make positive habits stick with this easy-to-use habit-building app.

## Rankings

- #208,084 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.INTERNET`
- `android.permission.POST_NOTIFICATIONS`
- `android.permission.RECEIVE_BOOT_COMPLETED`
- `android.permission.VIBRATE`
- `android.permission.WAKE_LOCK`
- `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE`
- `com.google.android.gms.permission.AD_ID`

## Review summary

Users appreciate the app's simple, minimalist design, lack of ads, and ease of adding goals which makes habit tracking straightforward and distraction-free. However, multiple reviews highlight limitations such as inability to edit habit names or undo completion errors, issues with reminder notifications not working properly or arriving late, and mandatory reminder settings that may not suit all goals. Some users reported bugs causing progress resets, indicating room for stability improvements.

### Pros

- Simple and minimalist design that is easy to use
- No ads, providing a distraction-free experience
- Effective for habit tracking and goal achievement
- Quick and straightforward to add goals
- Helpful reminder feature (though with some issues)

### Cons

- Cannot edit habit names after creation
- Inability to modify or undo previous days' completion status
- Reminder notifications sometimes fail or arrive at wrong times
- Mandatory reminder setting when adding goals is inconvenient for some users
- App occasionally restarts progress or has bugs leading to data loss

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.deviation.twenty_one_days)