“CloseCircle is aiming to be pre-emptive wherever possible and to actually warn members away from dangers that they may not even yet be aware of,” Simon Philips, the chairman of Drum Cussac, wrote in an email.

Terms: Annual memberships cost £195 a person, or about $260; £349 a couple; and £595 for a family of up to six people; closecircle.com.

Tracking users on demand

Developed by Incident Management Group, a firm that specializes in the security of business travelers and individuals, FoneTrac allows users to check in at the press of a button to let the firm and anyone on their designated contact list know that they are fine. The company also monitors security developments worldwide and will send a message to app users if anything from a terrorist attack to an earthquake is going on where they are. In the event of an emergency, a panic button provides the firm your location and triggers g round support .

The app does not track a user’s physical location continuously, except in the event of a panic alert when it runs continuously, but inconspicuously, until it is physically turned off.

Terms: $15 a month for a minimum of three months; fonetrac-go.com.

Focusing on health and safety

Established in 2012 and available on a mobile app since 2013, Sitata sends out “Trip Alerts” that cover any potentially travel-disrupting event, other than the usual flight delays. These could be disease outbreaks, violent protests, extreme weather or transit strikes. The coverage is global and the firm uses artificial intelligence to monitor the media, traditional and social, to track events worldwide.

Founded by Ron St. John, the former director of emergency preparedness for Canada, and his son Adam St. John, the app was initially developed to disseminate public health information and expanded to more broadly address security. It remains strong in tracking disease outbreaks; the app will even inform users after they have returned from a trip if a disease such as dengue fever has broken out where they were traveling and if there was an incubation period.

“This is important because you may come home and start to feel sick and go to your doctor and forget to say you were in Brazil, which could lead to misdiagnosis,” said Adam St. John, the chief executive officer of Sitata.