21 Days Challenge

21 days to introduce life changing habits in your life.

Kati & Lima · com.limatech.dayschallenge.dayschallenge

Not rated yet 10M+ downloads v8.4.2 51.9 MB Android 6.0+ PEGI 3 · Everyone

Download APK 51.9 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v8.4.2 (1823)
Updated: Oct 3, 2026 (6 days ago)
APK size: 51.9 MB
Requires: Android 6.0+ (API 23)
CPU support: ARM 32-bit
Category: Lifestyle (app)
Listed since: Dec 16, 2020 (at least)
Permissions: 21 (1 sensitive)
Website: 21dayschallengeapp.com
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

21 Days Challenge is an app by Kati & Lima in the Lifestyle category, listed since at least December 2020. It includes native code only for ARM 32-bit, so it won't run on 64-bit-only phones such as recent Pixels.

It asks for 21 permissions, 1 of them sensitive: read media audio. It asks for the same permissions as version 8.4.1. The app offers in-app purchases through Google Play and can read the advertising ID that ad and analytics services use.

What's new in v8.4.2

✨ Smoother and steadier Behind-the-scenes improvements to keep your days running smoothly, in all 11 languages. "We are what we repeatedly do. Excellence, then, is not an act, but a habit." — Will Durant

Description

From the listing uploaded by “appupdater”.

Create your ideal life with life-changing habits. It is estimated that it takes people 21 days to form a new habit. So it’s a perfect amount of time to change or introduce something new in your life. Choose the best challenge for you (or create your own) and do it for 21 days and you’re going to see how the habit becomes part of your lifestyle day by day. Starting a healthy lifestyle, taking a break away from the internet, practicing gratitude, learning a new language, trying to be more productive, finding happiness, self-help, how to study effectively, ways to spread kindness and positivity, tips for fixing your sleeping schedule, self-care practices, decluttering, being more confident, writing journal prompts and daily positive affirmations are some of the challenges that you can find in the app. Basically, you can use this app as a habit tracker. Once you complete your daily task, you can mark it as completed and collect the points (to customize your avatar, to unlock motivational reminders and free wallpapers). In the gratitude challenge, you can write your thoughts and share them in the feed (it can be anonymous too). Here you're going to see all the community answers and you can also give it a like, comment, or send gifts to your favorite ones. Create a healthier and happier mind with journaling. With this app, you can write a daily journal and choose your daily mood. Then you can track your mood in the calendar and see all your previous records. There’s a selection of positive wallpapers for your phone and motivational reminders to share with your friends. Also, some relaxing music. Enable notifications and choose the time to be notified to remind you to do the challenge every day. You have all of this in one app for free! Don’t forget to take care of your body and mind. It's the only place you have to live. Your journey to self-improvement and better mental health starts today!

Version history

2 versions are listed, going back to v8.4.1.

v8.4.2 LATEST Oct 3, 2026 51.9 MB TRUSTED v8.4.1 Oct 3, 2026 51.9 MB TRUSTED

All 2 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Sep 7, 2026.
Certificate issued to “PT” This is the certificate of the Google Play version.
Same certificate as the other version checked

Store checks and file details

Developer signature not checked yet Oct 3, 2026
Validated against Google Play Sep 7, 2026
Signed byCN=Gocn?alo Lima, OU=PT, O=PT, L=PT, ST=PT, C=PT
Signing certificate (SHA-1)B9:39:AF:DA:7E:FE:7F:21:72:73:A4:FF:2A:3B:87:E3:95:BB:5C:CB
File MD52675bde2be1b22a0f900f51be0233291
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (1 other version compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (21)

21 Days Challenge requests 21 permissions, 1 of them sensitive.

Read media audio Sensitive android.permission.READ_MEDIA_AUDIO
Access adservices ad id android.permission.ACCESS_ADSERVICES_AD_ID
Access adservices attribution android.permission.ACCESS_ADSERVICES_ATTRIBUTION
Access adservices topics android.permission.ACCESS_ADSERVICES_TOPICS
Advertising ID com.google.android.gms.permission.AD_ID
Apphub bind apphub service (custom) com.applovin.array.apphub.permission.BIND_APPHUB_SERVICE
Control vibration android.permission.VIBRATE
Full network access android.permission.INTERNET
Google Play install referrer com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE
In-app purchases (Google Play Billing) com.android.vending.BILLING
Internal broadcast protection (app-defined) com.limatech.dayschallenge.dayschallenge.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Prevent the device from sleeping android.permission.WAKE_LOCK
Read Google service settings com.google.android.providers.gsf.permission.READ_GSERVICES
Receive push notifications com.google.android.c2dm.permission.RECEIVE
Run at startup android.permission.RECEIVE_BOOT_COMPLETED
Run foreground services android.permission.FOREGROUND_SERVICE
Schedule exact alarms android.permission.SCHEDULE_EXACT_ALARM
Show notifications android.permission.POST_NOTIFICATIONS
Use exact alarm android.permission.USE_EXACT_ALARM
View Wi-Fi connections android.permission.ACCESS_WIFI_STATE
View network connections android.permission.ACCESS_NETWORK_STATE

Required hardware & features

Basic touch input android.hardware.faketouch
Wi-Fi android.hardware.wifi