
SIGNL4 – Mobile Alerting
Critical Alerting with Tracking, Escalation, On-Call Duty and Shift Scheduling
Derdack GmbH · com.derdack.signl4
At a glance
- Latest version
- v4.3.1 (385)
- Updated
- Feb 25, 2025 (1 year ago)
- APK size
- 10.9 MB
- Requires
- Android 6.0+ (API 23)
- CPU support
- x86 32-bit, x86 64-bit, ARM 32-bit, ARM 64-bit
- Graphics
- OpenGL ES 2.0+
- Category
- Business (app)
- Listed since
- Oct 20, 2020 (at least)
- Permissions
- 23 (7 sensitive)
- Website
- signl4.com
- Developer contact
- [email protected]
- Privacy
- Developer's privacy policy
About this APK
SIGNL4 – Mobile Alerting is an app by Derdack GmbH in the Business category, listed since at least October 2020. It includes native code for x86 32-bit, x86 64-bit, ARM 32-bit and ARM 64-bit, so it runs on practically every phone.
It asks for 23 permissions, 7 of them sensitive, including precise location, camera and read contacts. The app can read the advertising ID that ad and analytics services use.
What's new in v4.3.1
Description
From the listing uploaded by “appupdater”.
Security & authenticity
Signing certificate
- Certificate issued to “Derdack GmbH” The developer's name — though anyone can put any name in a certificate.
Store checks and file details
- Developer signature verified Feb 25, 2025
- Signed byCN=Matthes Derdack, OU=Research & Development, O=Derdack GmbH, L=Potsdam, ST=Brandenburg, C=DE
- Signing certificate (SHA-1)84:61:B4:65:AD:5A:33:78:B0:CD:81:D8:6F:81:41:9F:04:B4:66:6B
- File MD525e78a321e2d76f276ed03b767aacef6
- 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. AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.
Permissions (23)
SIGNL4 – Mobile Alerting requests 23 permissions, 7 of them sensitive.
- Approximate location Sensitive android.permission.ACCESS_COARSE_LOCATION
- Camera Sensitive android.permission.CAMERA
- Precise location Sensitive android.permission.ACCESS_FINE_LOCATION
- Read calendar Sensitive android.permission.READ_CALENDAR
- Read contacts Sensitive android.permission.READ_CONTACTS
- Read media images Sensitive android.permission.READ_MEDIA_IMAGES
- Write calendar Sensitive android.permission.WRITE_CALENDAR
- Access adservices ad id android.permission.ACCESS_ADSERVICES_AD_ID
- Access adservices attribution android.permission.ACCESS_ADSERVICES_ATTRIBUTION
- Access notification policy android.permission.ACCESS_NOTIFICATION_POLICY
- Advertising ID com.google.android.gms.permission.AD_ID
- Authenticate accounts android.permission.AUTHENTICATE_ACCOUNTS
- 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
- Internal broadcast protection (app-defined) com.derdack.signl4.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
- Modify audio settings android.permission.MODIFY_AUDIO_SETTINGS
- Nfc android.permission.NFC
- Prevent the device from sleeping android.permission.WAKE_LOCK
- Receive push notifications com.google.android.c2dm.permission.RECEIVE
- Show notifications android.permission.POST_NOTIFICATIONS
- View network connections android.permission.ACCESS_NETWORK_STATE
- Write sync settings android.permission.WRITE_SYNC_SETTINGS
Required hardware & features
- Basic touch input android.hardware.faketouch
- Portrait screen android.hardware.screen.portrait
SIGNL4 – Mobile Alerting APK: questions and answers
Can I install this APK over the version I already have?
Only if it is signed with the same certificate as the copy on your phone and isn't an older version. If Android says “App not installed”, the certificates differ; uninstalling your copy first works but deletes its data unless it is backed up.
Is the SIGNL4 – Mobile Alerting APK safe?
No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. After downloading, check that the file's MD5 is 25e78a321e2d76f276ed03b767aacef6.