Concentration Grid
v1.0 · 7.2 MB · code 21000
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File information
UpdatedOct 28, 2024
PublishedOct 28, 2024
Packagecom.stalwart.concentrationgridpro
Versionv1.0 (21000)
Size7.2 MB
MD56d8fe68581b47c4db9641f24713a9987
Min SDK22
Malware scanUNKNOWN
Signature SHA11A:77:10:DF:19:6A:78:A8:1F:D9:E9:BC:16:FE:09:58:91:09:F2:8E
SignerC="+1", ST=WI, L=HARTLAND, O=Stalwart Group, OU=Stalwart Group, CN=Walter Zimmerman
Total downloads1,000
This version1,000
DeveloperSTALWART GROUP LLC
Age ratingEveryone
What's new in v1.0
Overall performance/aesthetic enhancements
Update of HISTORY feature (including format/archive)
Update of ADMINISTRATION ... PROFILE feature (for posts to leaderboards)
Update of SHARE feature (integration with social media)
Improved integration with community website (www.concentrationgrid.net)
Update of HISTORY feature (including format/archive)
Update of ADMINISTRATION ... PROFILE feature (for posts to leaderboards)
Update of SHARE feature (integration with social media)
Improved integration with community website (www.concentrationgrid.net)
Security scan
UNKNOWN
- Developer signature verified 2024-10-28
- Signature SHA1 1A:77:10:DF:19:6A:78:A8:1F:D9:E9:BC:16:FE:09:58:91:09:F2:8E
- File MD5 6d8fe68581b47c4db9641f24713a9987
How to install Concentration Grid v1.0 on Android 5.1 Lollipop+
Takes about 2 minutes. You'll need roughly 7.2 MB of free storage.
- Grab com.stalwart.concentrationgridpro_21000.apk — hit the Download button above (7.2 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 6d8fe68581b47c4d…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find com.stalwart.concentrationgridpro_21000.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 C="+1", ST=WI, L=HARTLAND, O=Stalwart Group, OU=Stalwart Group, CN=Walter Zimmerman. 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 UNKNOWN).
- Done — open Concentration Grid — tap Open on the install screen, or find the Concentration Grid icon in your app drawer.
Common install errors for Concentration Grid
- "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 5.1 Lollipop 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.