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SOS Alerter

Privacy-focused emergency app with SMS location tracking and silent recording.
SOS Alerter is a modern, privacy-focused emergency assistance application designed to keep you safe when it matters most. It operates entirely offline, storing all user credentials, contacts, and captured media locally on your device.

Key Features:
* Emergency SMS & Call Alerts: Instantly send custom emergency SMS messages with high-accuracy GPS coordinates and auto-dial your designated contact or emergency services.
* Continuous GPS Tracking: Keep contacts updated with periodic location sharing.
* Discreet Evidence Gathering: Silently capture photos using front and back cameras, and record ambient audio during an active emergency.
* Versatile Activation Triggers: Trigger an alert via a triple-press of the power button, shaking the device, voice commands ("Help Me"), or a long press on the main screen button.
* Loud Siren & Strobe: Activate a loud siren and strobe light to grab nearby attention.
* No Trackers or Ads: Free and open-source under GPLv3, with absolutely no telemetry, analytics, or third-party connections.
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Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 1.1.1 (7) suggested Added on Jul 28, 2026

    This version requires Android 8.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • access approximate location only in the foreground
      This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
    • directly call phone numbers
      Allows the app to call phone numbers without your intervention. This may result in unexpected charges or calls. Note that this doesn't allow the app to call emergency numbers. Malicious apps may cost you money by making calls without your confirmation.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "camera"
      Allows the app to make use of foreground services with the type "camera"
    • run foreground service with the type "location"
      Allows the app to make use of foreground services with the type "location"
    • run foreground service with the type "microphone"
      Allows the app to make use of foreground services with the type "microphone"
    • show notifications
      Allows the app to show notifications
    • read your contacts
      Allows the app to read data about your contacts stored on your phone. Apps will also have access to the accounts on your phone that have created contacts. This may include accounts created by apps you have installed. This permission allows apps to save your contact data, and malicious apps may share contact data without your knowledge.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.
    • read phone status and identity
      Allows the app to access the phone features of the device. This permission allows the app to determine the phone number and device IDs, whether a call is active, and the remote number connected by a call.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • send and view SMS messages
      Allows the app to send SMS messages. This may result in unexpected charges. Malicious apps may cost you money by sending messages without your confirmation.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • modify or delete the contents of your shared storage
      Allows the app to write the contents of your shared storage.
    • org.sosalerter.app.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 4.8 MiB PGP Signature | Build Log

  • Version 1.1.0 (6) - Added on Jul 01, 2026

    This version requires Android 8.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • access approximate location only in the foreground
      This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
    • directly call phone numbers
      Allows the app to call phone numbers without your intervention. This may result in unexpected charges or calls. Note that this doesn't allow the app to call emergency numbers. Malicious apps may cost you money by making calls without your confirmation.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "camera"
      Allows the app to make use of foreground services with the type "camera"
    • run foreground service with the type "location"
      Allows the app to make use of foreground services with the type "location"
    • run foreground service with the type "microphone"
      Allows the app to make use of foreground services with the type "microphone"
    • show notifications
      Allows the app to show notifications
    • read your contacts
      Allows the app to read data about your contacts stored on your phone. Apps will also have access to the accounts on your phone that have created contacts. This may include accounts created by apps you have installed. This permission allows apps to save your contact data, and malicious apps may share contact data without your knowledge.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.
    • read phone status and identity
      Allows the app to access the phone features of the device. This permission allows the app to determine the phone number and device IDs, whether a call is active, and the remote number connected by a call.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • send and view SMS messages
      Allows the app to send SMS messages. This may result in unexpected charges. Malicious apps may cost you money by sending messages without your confirmation.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • modify or delete the contents of your shared storage
      Allows the app to write the contents of your shared storage.
    • org.sosalerter.app.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 4.8 MiB PGP Signature | Build Log

  • Version 1.0.0-beta5 (5) - Added on Jun 24, 2026

    This version requires Android 8.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • access approximate location only in the foreground
      This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • directly call phone numbers
      Allows the app to call phone numbers without your intervention. This may result in unexpected charges or calls. Note that this doesn't allow the app to call emergency numbers. Malicious apps may cost you money by making calls without your confirmation.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "camera"
      Allows the app to make use of foreground services with the type "camera"
    • run foreground service with the type "location"
      Allows the app to make use of foreground services with the type "location"
    • run foreground service with the type "microphone"
      Allows the app to make use of foreground services with the type "microphone"
    • show notifications
      Allows the app to show notifications
    • read your contacts
      Allows the app to read data about your contacts stored on your phone. Apps will also have access to the accounts on your phone that have created contacts. This may include accounts created by apps you have installed. This permission allows apps to save your contact data, and malicious apps may share contact data without your knowledge.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.
    • read phone status and identity
      Allows the app to access the phone features of the device. This permission allows the app to determine the phone number and device IDs, whether a call is active, and the remote number connected by a call.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • send and view SMS messages
      Allows the app to send SMS messages. This may result in unexpected charges. Malicious apps may cost you money by sending messages without your confirmation.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • modify or delete the contents of your shared storage
      Allows the app to write the contents of your shared storage.
    • org.sosalerter.app.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 4.7 MiB PGP Signature | Build Log

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