aCalendar - your calendar v2.9.1
APK · 13.5 MB · version code 2009100 · Android 5.0+ · uploaded Jan 25, 2026
- Signature matches the Google Play version Details
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Compared with the latest version
The latest version is v2.9.5, uploaded May 14, 2026 — about 4 months after this one.
- Size: this file is 13.5 MB; the latest is 13.3 MB (146.6 KB smaller).
- Both versions request the same permissions.
File information
- Version
- v2.9.1 (2009100)
- Uploaded
- Jan 25, 2026
- Size
- 13.5 MB
- Requires
- Android 5.0+ (API 21)
- CPU support
- Any (no native code)
- Graphics
- OpenGL ES 2.0+
- Screen
- Small screens and larger
- MD5
- a9aa0543aeca28499c16af15863508b2
- Signing certificate (SHA-1)
- 97:D1:4F:B2:29:0A:0D:39:FE:D5:37:18:DD:82:DE:AC:2B:BD:05:D9
- Signed by
- CN=Matt
- File name
- org-withouthat-acalendar-2009100-73293508-a9aa0543aeca28499c16af15863508b2.apk
- Package
- org.withouthat.acalendar
- Downloads (all versions)
- 10M+
- Age rating
- PEGI 3 · Everyone
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
Permissions (22)
This version requests 22 permissions, 5 of them sensitive.
- Find accounts on the device Sensitive android.permission.GET_ACCOUNTS
- Read calendar Sensitive android.permission.READ_CALENDAR
- Read contacts Sensitive android.permission.READ_CONTACTS
- Write calendar Sensitive android.permission.WRITE_CALENDAR
- Write contacts Sensitive android.permission.WRITE_CONTACTS
- Control vibration android.permission.VIBRATE
- Dmfs read tasks (custom) org.dmfs.permission.READ_TASKS
- Dmfs write tasks (custom) org.dmfs.permission.WRITE_TASKS
- Full network access android.permission.INTERNET
- In-app purchases (Google Play Billing) com.android.vending.BILLING
- Internal broadcast protection (app-defined) org.withouthat.acalendar.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
- Prevent the device from sleeping android.permission.WAKE_LOCK
- Read sync settings android.permission.READ_SYNC_SETTINGS
- Read sync stats android.permission.READ_SYNC_STATS
- Run at startup android.permission.RECEIVE_BOOT_COMPLETED
- Run foreground services android.permission.FOREGROUND_SERVICE
- Show notifications android.permission.POST_NOTIFICATIONS
- Tasks read tasks (custom) org.tasks.permission.READ_TASKS
- Tasks write tasks (custom) org.tasks.permission.WRITE_TASKS
- Use exact alarm android.permission.USE_EXACT_ALARM
- View network connections android.permission.ACCESS_NETWORK_STATE
- Write sync settings android.permission.WRITE_SYNC_SETTINGS
Security & authenticity
Security rating: Trusted
Signing certificate
- Signature matches the Google Play version Checked by the source store on Jan 25, 2026.
- Certificate issued to “Matt” This is the certificate of the Google Play version.
- Same certificate as the 2 other versions checked
Store checks
- Developer signature not checked yet Jan 25, 2026
- Validated against Google Play Jan 25, 2026
- Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020
Scans come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself.
How to install aCalendar - your calendar on Android 5.0+
You'll need about 26.9 MB of free space.
- Download the APK — tap Download APK above (13.5 MB). Chrome shows “File might be harmful” for every APK file; choose Download anyway only if you trust this file.
- Open the file — tap the download notification, or open Files › Downloads and tap org-withouthat-acalendar-2009100-73293508-a9aa0543aeca28499c16af15863508b2.apk.
- Allow the install (first time only) — Android 8 and later asks for permission the first time an app opens an APK: tap Settings in the prompt, turn on Allow from this source, then go back. Manual path: Settings › Apps › Special app access › Install unknown apps (on Samsung: Settings › Apps › ⋮ › Special access). On Android 7 and older: Settings › Security › Unknown sources.
- Check the file (optional) — the MD5 of the downloaded file should be a9aa0543aeca28499c16af15863508b2. If it differs, the file is damaged or was changed: delete it and download again.
- Tap Install — Android asks “Do you want to install this app?”. If Google Play Protect shows a warning, read it before you continue: the source store rated this file Trusted, but only install apps from sources you trust. If an earlier version is installed, this one only installs as an update when it is signed with the same certificate (SHA-1 shown above).
- Open aCalendar - your calendar — tap Open on the install screen, or find it in your app drawer.
Common install problems
- “App not installed” — a version signed with a different certificate, or a newer version, is already installed (Android doesn't allow downgrades). Uninstall it first; back up your data, because uninstalling deletes it.
- “There was a problem parsing the package” — the file is incomplete, or your Android is too old (this version needs Android 5.0+). Download it again, or pick an older version.
- Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.