The best alternatives to Mr Gabriel are Guardians, SafeTrek, and Ping. If these 3 options don't work for you, we've listed a few more alternatives below.
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Guardians is a personal safety app designed to be used with your close family & trusted friends. It starts with location sharing but it’s lot more than that.
Ping is a social network app that keeps you safe. Whether you're in your hometown or abroad, Ping will alert you of danger and help you navigate your way to the nearest safe place.
Up to now, to use a safety app you would add people on your app and track them at all times. Safe Circle allow you to create different circles of friends to track you during specific Journeys.