Turn your phone into a Morse code device, to transmit emergency messages.
About this app
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
Licensed under GPL-3.0-only, by Weil Jimmer.
What's New in v1.0.3
Imported from the F-Droid repository index.
- # 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.
Version history
Sep 5, 2025 · 9.5 MB · Android API 23–36 · code 10003
Imported from the F-Droid repository index.
- # 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.
SHA-256 acd2d233e12f2159714aa7b08a20086e37afdb7ed7de9de4ad38f90776bd84c4
Aug 21, 2025 · 5.9 MB · Android API 23–36 · code 10002
Imported from the F-Droid repository index.
- # SOS Flashlight v1.0.2 (10002) - Minor Update
- - Added: Flashlight Widget - Now you can add a convenient icon to your home screen for quick one-tap flashlight control.
- - Added: Screen Light feature - Access a full-screen white display for illumination when your device doesn't have a built-in flashlight.
SHA-256 7802167c96e7d220dd7c6c386261bd2d43054e4673fa88604a58fec0e06a5ad6
Aug 17, 2025 · 5.8 MB · Android API 23–36 · code 10001
Imported from the F-Droid repository index.
- # SOS Flashlight v1.0.1 (10001) - Minor Update
- - Fix: Adjust interval limits and update dependencies.
SHA-256 be943e077722c9f0b15daada7b3a285fdea613dcb3eaa9a938a16ebbb2af4942
Will it run on your device?
92%
- Runs on a broad range of modern Android versions.
- Multiple CPU architectures are covered.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be org.wbftw.weil.sos_flashlight is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 1.0.2 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall SOS Flashlight: Advanced Morse Code Tool first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of SOS Flashlight: Advanced Morse Code Tool, and a listing is removed when the evidence for it stops holding up.
Get SOS Flashlight: Advanced Morse Code Tool
Every source we list for org.wbftw.weil.sos_flashlight is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
acd2d233e12f2159714aa7b08a20086e37afdb7ed7de9de4ad38f90776bd84c4
Signing certificate
2835badb45302f83c3cd91c6c480cf0d3acb7a3d26a4cc02c39f580f56e5ec1e
Permissions Required
What each permission lets SOS Flashlight: Advanced Morse Code Tool do. A highlighted one is worth a second look — not necessarily wrong, just worth asking whether this app needs it.
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
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