aCalendar - your calendar
v2.9.1 · 13.5 MB · code 2009100
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File information
UpdatedJan 25, 2026
PublishedMay 21, 2022
Packageorg.withouthat.acalendar
Versionv2.9.1 (2009100)
Size13.5 MB
MD5a9aa0543aeca28499c16af15863508b2
Min SDK21
Malware scanTRUSTED
Signature SHA197:D1:4F:B2:29:0A:0D:39:FE:D5:37:18:DD:82:DE:AC:2B:BD:05:D9
SignerCN=Matt
Total downloads10,000,000
This version10,000,000
DeveloperTapir Apps GmbH
Age ratingEveryone
What's new in v2.9.1
Welcome to aCalendar 2.8!
If you have any questions or problems, please go to MENU - HELP (or visit https://acalendar.tapirapps.de)!
As indie app studio we rely on good ratings, especially as all our upgrades are one-time purchases.
Full changelog: https://acalendar.tapirapps.de/en/support/solutions/articles/36000469282
If you have any questions or problems, please go to MENU - HELP (or visit https://acalendar.tapirapps.de)!
As indie app studio we rely on good ratings, especially as all our upgrades are one-time purchases.
Full changelog: https://acalendar.tapirapps.de/en/support/solutions/articles/36000469282
Security scan
TRUSTED
- Developer signature verified 2026-01-25
- Signature SHA1 97:D1:4F:B2:29:0A:0D:39:FE:D5:37:18:DD:82:DE:AC:2B:BD:05:D9
- File MD5 a9aa0543aeca28499c16af15863508b2
How to install aCalendar - your calendar v2.9.1 on Android 5.0 Lollipop+
Takes about 2 minutes. You'll need roughly 13.5 MB of free storage.
- Grab org.withouthat.acalendar_2009100.apk — hit the Download button above (13.5 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 a9aa0543aeca2849…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find org.withouthat.acalendar_2009100.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=Matt. 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 aCalendar - your calendar — tap Open on the install screen, or find the aCalendar - your calendar icon in your app drawer.
Common install errors for aCalendar - your calendar
- "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 5.0 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.