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ChasR Logo

ChasR is an open-source end-to-end encrypted GPS tracking system. It can be used directly as service or hosted by oneself. The goal of ChasR is to offer a privacy protecting GPS tracking service by using end-to-end encryption. This means that the sensitive location data of a user is directly encrypted on the device before it is sent to the server. Since the server does not know the key for the encryption, it cannot see the location data. The stored location data can be accessed either via Android App or web interface. Again, the location data is decrypted on the device and hence the server has no way of knowing the location of the user. All you need to use ChasR is a free account and ChasR logging application.

A diagram showing the ChasR architecture (a logger device for collecting the location data, the server that stores the encrypted data, and the map device showing the location data) looks like the following:

The ChasR GPS Tracking System is separated into multiple components:




Additionally, the ChasR GPS Tracking System can be used as part of the AlertR Alarm and Monitoring System (for example as a car alarm system).

ChasR Android Map

This is the Android application showing the map for the ChasR GPS Tracking System. Its task is to fetch the encrypted location data from the server, decrypt it and show it on the map. The GPS location of the logger devices can either be viewed live to track a specific active device or as a summary of a day. For mobile devices based on Android, it is a more convenient way to display the location data instead of using the ChasR web service.

screenshot_main screenshot_live screenshot_view


Instead of compiling the source code yourself, you can install the App using different app stores:

Supporting ChasR

If you like this project you can help to support it by contributing to it. You can contribute by writing tutorials, creating and documenting exciting new ideas to use ChasR (for example on the AlertR subreddit), writing code for it, and so on.

If you do not know how to do any of it or do not have the time, you can support the project by donating or support me on Patreon. Since the service has a monthly upkeep, the donation helps to keep these services free for everyone.





Bugs and Feedback

For questions, bugs and discussion please use the Github issues.