This is a proof of concept for an offline sos app designed to assist individuals in danger, particularly those who may have been kidnapped, in alerting their emergency contacts without the need to click any buttons on their phone.

The app utilizes the phone’s microphone and on-device machine learning, specifically for sound classification, to identify if the user is in a perilous situation. If a potential danger is detected, alert messages containing the user’s location are sent to their designated emergency contacts.

? Note : This project is currently in an experimental phase and is presented for conceptual and exploratory purposes. It may not function reliably in all scenarios. Users are strongly advised against relying on this app for critical safety needs. ?



Why this project ?

This POC specifically addresses the challenges posed by scenarios where conventional methods of alerting, such as clicking buttons, might be impractical or unsafe. By relying on the phone’s microphone and on-device machine learning, the goal is to provide an automated and discreet system that can operate without direct user engagement. This is especially important in situations where physical or psychological constraints prevent individuals from actively using their phones to seek help.


  • Ensuring the reliability of sound recognition in noisy environments poses a challenge. External noises could interfere with the accuracy of the sound classification model, potentially leading to false detections.

  • Currently, there is no dataset available for sounds associated with kidnapping scenes. Therefore, I employed Yamnet, a sound classification model trained on AudioSet. I focused on detecting specific sounds such as “groan,” “whimper,” “crying,” “sobbing,” and ” screaming,” which could be indicative of a kidnapping scenario.

  • Furthermore, the choice to operate the app offline addresses practical concerns such as preserving battery life and ensuring functionality in areas with unreliable internet connectivity.

Some ideas to enhance the project

Here are some ideas to enhance the app:

  • Explore integration with wearable health devices to gather additional biometric data, such as heart rate and stress levels. This information could provide valuable context for danger detection and enhance the app’s overall effectiveness.

  • Enable real-time communication between the app and local emergency services. This could facilitate quicker response times and provide emergency personnel with crucial information about the user’s situation.

  • The app could incorporate the ability to record sounds. In cases where the user has an internet connection, these sounds could be transmitted to a server. This approach may aid in creating a dataset and training a custom model specifically for detecting kidnapping scenarios.



Designed and developed by 2023 yveskalume (Yves Kalume)

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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