21 Days Challenge

Name: 21 Days Challenge
Availability: InStock
Author: Kati & Lima

v8.4.0 · 55.3 MB · code 4819

2e4ab39bd6bc8547ac4de815c13bb6b7 TRUSTED

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UpdatedFeb 12, 2026

PublishedDec 16, 2020

Packagecom.limatech.dayschallenge.dayschallenge

Versionv8.4.0 (4819)

Size55.3 MB

MD52e4ab39bd6bc8547ac4de815c13bb6b7

Min SDK23

ABIsx86-64

Malware scanTRUSTED

Signature SHA1B9:39:AF:DA:7E:FE:7F:21:72:73:A4:FF:2A:3B:87:E3:95:BB:5C:CB

SignerCN=Gocn?alo Lima, OU=PT, O=PT, L=PT, ST=PT, C=PT

Total downloads10,000,000

This version10,000,000

DeveloperKati & Lima

Age ratingEveryone

Fixed an issue where created and community challenges did not appear.

This is the beginning of anything you want

TRUSTED

Takes about 2 minutes. You'll need roughly 55.3 MB of free storage.

Grab com.limatech.dayschallenge.dayschallenge_4819.apk — hit the Download button above (55.3 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
(Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches 2e4ab39bd6bc8547…. Any difference means the file is corrupted or tampered — delete and re-download.
Open the APK — tap the download notification, or find com.limatech.dayschallenge.dayschallenge_4819.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
Check the signer — the install screen will name the publisher. For this build it should read CN=Gocn?alo Lima, OU=PT, O=PT, L=PT, ST=PT, C=PT. If it doesn't match, cancel — you have the wrong file.
Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
Done — open 21 Days Challenge — tap Open on the install screen, or find the 21 Days Challenge icon in your app drawer (this build targets x86-64 devices).

Common install errors for 21 Days Challenge

"App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
"Parse error" — the APK is for a newer Android than yours. This version needs Android 6.0 Marshmallow or later. Pick an older build from the versions list below.
"There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.