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SOS Flashlight: Advanced Morse Code Tool

Turn your phone into a Morse code device, to transmit emergency messages.
New in version 1.0.3
# SOS Flashlight v1.0.3 (10003) - Minor Update

- Added: Screen Light color selection feature, now you can change the screen light color through the color palette.
- Fixed: Allow the use of longer time intervals to enable normal vibration for devices that cannot vibrate in extremely short periods of time.
SOS Flashlight App transforms your smartphone into a powerful Morse code signaling device, capable of transmitting emergency messages or custom text through multiple channels simultaneously.

Features

- Signal Transmission Methods
- Flashlight: Utilizes your device's camera led flashlight to transmit visual signals.
- Vibration: Sends tactile signals through device vibration.
- Audio: Generates clear audio tones at 700Hz frequency.
- Screen Light: Maximizes screen brightness to create visual signals in darkness.
- Core Capabilities
- Background Service: Continue signaling even when the app is minimized or screen is locked.
- Message Customization: Send any custom message in Morse code.
- Adjustable Speed: Choose from slow, medium, fast, or custom transmission speeds.
- Morse Code Decoder: Convert received Morse code into readable text.
- User Preferences: Independently toggle each signaling method based on your needs.

Usage

- Emergency SOS: Press the SOS button to immediately begin transmitting the international SOS signal (... --- ...).
- Custom Message: Enter your text in the input field and press "Send" to convert and transmit.
- Decoder: Navigate to the decoder screen to translate incoming Morse code signals.
- Settings: Customize transmission speed and toggle different signaling methods.

Contribute

Contributions are welcome! Feel free to open issues or submit pull requests on our GitHub repo.

License

This project is licensed under the GNU General Public License (GPLv3) - see the LICENSE file for details.

Source

https://github.com/WeilJimmer/SOSFlashlightApp.git
  • app screenshot
  • app screenshot
  • app screenshot

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 1.0.3 (10003) suggested Added on Sep 05, 2025

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 6.0 or newer.

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

    Permissions
    • android.permission.FLASHLIGHT
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "mediaPlayback"
      Allows the app to make use of foreground services with the type "mediaPlayback"
    • show notifications
      Allows the app to show notifications
    • control vibration
      Allows the app to control the vibrator.
    • org.wbftw.weil.sos_flashlight.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 9 MiB PGP Signature | Build Log

  • Version 1.0.2 (10002) - Added on Aug 21, 2025

    This version requires Android 6.0 or newer.

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

    Permissions
    • android.permission.FLASHLIGHT
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "mediaPlayback"
      Allows the app to make use of foreground services with the type "mediaPlayback"
    • show notifications
      Allows the app to show notifications
    • control vibration
      Allows the app to control the vibrator.
    • org.wbftw.weil.sos_flashlight.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 5.9 MiB PGP Signature | Build Log

  • Version 1.0.1 (10001) - Added on Aug 17, 2025

    This version requires Android 6.0 or newer.

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

    Permissions
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "mediaPlayback"
      Allows the app to make use of foreground services with the type "mediaPlayback"
    • show notifications
      Allows the app to show notifications
    • control vibration
      Allows the app to control the vibrator.
    • org.wbftw.weil.sos_flashlight.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 5.8 MiB PGP Signature | Build Log

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