Oksigenia SOS is an offline-first personal safety app for outdoor sports and high-risk environments. No account, no cloud, no Google Services required — everything runs on your device.
When something goes wrong, it sends an SMS alert with your GPS coordinates to your emergency contact. No internet connection needed.
Smart Fall Detection (Smart Sentinel)
The accelerometer monitors you continuously at high frequency. A sudden impact triggers an observation window. If sustained walking movement is detected during that window, the alarm is dismissed automatically — false positives from drops or normal jolts won't fire the SOS. If no rhythmic movement is detected, the SOS is sent.
Activity profiles
Pick the profile that matches what you're doing — Smart Sentinel adapts its sensitivity:
- Trekking / Hiking: balanced default for walking outdoors.
- Running (road): tuned for the sustained high-G cadence of road running, with an adaptive rhythm detector.
- Trail running / MTB: higher impact threshold for terrain with constant vibration.
- Mountaineering: longer observation window for slow recoveries on technical ground.
- Paragliding / Kayak / Watersports: automatic fall detection is disabled (the sensor cannot reliably interpret flight or water motion); inactivity monitor and manual SOS remain active.
- Professional / Rescue: extended observation window for advanced operational use.
Inactivity Monitor (Dead Man's Switch)
Set a check-in timer. If you don't confirm you're OK before it expires, the alert is sent automatically. Essential for solo adventures where a fall might leave you conscious but unable to call for help.
Live Tracking
Send your GPS position by SMS every 30, 60 or 120 minutes. Pause, resume or check in manually at any time — without stopping the monitoring session.
Dying Gasp
When the battery drops below 5%, a final SMS with your last GPS position is sent automatically before the phone shuts down.
Privacy and Compatibility
- No account or registration required
- All data stays on your device — no cloud sync, no telemetry
- No trackers, no analytics, no ads
- Works on de-Googled phones (GrapheneOS, MicroG)
- Open source under GPLv3
About the permissions
Oksigenia SOS asks for sensitive permissions because its job is to call for help when you cannot. Each one maps to a single rescue function:
- SMS: sends the alert. SMS is the only channel that works in the mountains without internet.
- Location, including "Allow all the time" (background location): when you fall, your phone is in your pocket with the screen off and the app in the background. Without background access, Android can deny a fresh GPS fix at exactly that moment, and the SOS would leave without usable coordinates. Your position is read only when an alert or tracking update is being sent, and it travels exclusively inside the SMS to the contacts you configured — it is never uploaded anywhere. The app's only network use is a version check against a static file on oksigenia.com, which carries no personal data and no location.
- Motion sensors / physical activity: fall and inactivity detection.
- Battery exemption: so Android doesn't kill the monitoring service mid-route.
A safety app that prioritised permission minimalism over getting your coordinates to a rescuer would be failing at its only job. The privacy guarantee here is structural, not cosmetic: everything stays on the device.
Available in 11 languages: English, Spanish, French, German, Portuguese, Italian, Dutch, Swedish, Norwegian (Bokmål), Polish and Russian.
IMPORTANT: Oksigenia SOS is a support tool and does not replace professional emergency services. Its operation depends on mobile coverage, GPS signal and battery level.
Donate
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
-
x86_64
This version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Permissions
-
access location in the background
This app can access location at any time, even while the app is not in use.
-
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.
-
recognize physical activity
This app can recognize your physical activity.
-
run foreground service
Allows the app to make use of foreground services.
-
run foreground service with the type "dataSync"
Allows the app to make use of foreground services with the type "dataSync"
-
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 "mediaPlayback"
Allows the app to make use of foreground services with the type "mediaPlayback"
-
access sensor data at a high sampling rate
Allows the app to sample sensor data at a rate greater than 200 Hz
-
have full network access
Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
-
show notifications
Allows the app to show notifications
-
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.
-
ask to ignore battery optimizations
Allows an app to ask for permission to ignore battery optimizations for that app.
-
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.
-
display notifications as full screen activities on a locked device
Allows the app to display notifications as full screen activities on a locked device
-
control vibration
Allows the app to control the vibrator.
-
prevent phone from sleeping
Allows the app to prevent the phone from going to sleep.
-
com.oksigenia.oksigenia_sos.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK
21 MiB
PGP Signature
|
Build Log
-
arm64-v8a
This version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Permissions
-
access location in the background
This app can access location at any time, even while the app is not in use.
-
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.
-
recognize physical activity
This app can recognize your physical activity.
-
run foreground service
Allows the app to make use of foreground services.
-
run foreground service with the type "dataSync"
Allows the app to make use of foreground services with the type "dataSync"
-
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 "mediaPlayback"
Allows the app to make use of foreground services with the type "mediaPlayback"
-
access sensor data at a high sampling rate
Allows the app to sample sensor data at a rate greater than 200 Hz
-
have full network access
Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
-
show notifications
Allows the app to show notifications
-
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.
-
ask to ignore battery optimizations
Allows an app to ask for permission to ignore battery optimizations for that app.
-
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.
-
display notifications as full screen activities on a locked device
Allows the app to display notifications as full screen activities on a locked device
-
control vibration
Allows the app to control the vibrator.
-
prevent phone from sleeping
Allows the app to prevent the phone from going to sleep.
-
com.oksigenia.oksigenia_sos.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK
20 MiB
PGP Signature
|
Build Log
-
armeabi-v7a
This version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Permissions
-
access location in the background
This app can access location at any time, even while the app is not in use.
-
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.
-
recognize physical activity
This app can recognize your physical activity.
-
run foreground service
Allows the app to make use of foreground services.
-
run foreground service with the type "dataSync"
Allows the app to make use of foreground services with the type "dataSync"
-
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 "mediaPlayback"
Allows the app to make use of foreground services with the type "mediaPlayback"
-
access sensor data at a high sampling rate
Allows the app to sample sensor data at a rate greater than 200 Hz
-
have full network access
Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
-
show notifications
Allows the app to show notifications
-
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.
-
ask to ignore battery optimizations
Allows an app to ask for permission to ignore battery optimizations for that app.
-
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.
-
display notifications as full screen activities on a locked device
Allows the app to display notifications as full screen activities on a locked device
-
control vibration
Allows the app to control the vibrator.
-
prevent phone from sleeping
Allows the app to prevent the phone from going to sleep.
-
com.oksigenia.oksigenia_sos.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK
17 MiB
PGP Signature
|
Build Log
