I'm not a parent and a bit autistic so excuse the unemotional reply but surely there are other ways not to have anxiety about your children surely?:
Teach independence/self-defence/street smarts, encourage weight lifting for older kids, therapy/meditation for yourself (some anxiety is natural of course!), move to a safer city, have more children (easier to pair them up on adventures, plus less subconscious physiological fear of losing your one and only child), distract yourself and stay busy, go with them to places the first few times to assure yourself then take off your training wheels. Or just say no to certain things.
It doesn't seem to me a special case of anxiety that can only be addressed by spy apps and knowing you might be able to instantly contact them.
Teach independence/self-defence/street smarts, encourage weight lifting for older kids, therapy/meditation for yourself (some anxiety is natural of course!), move to a safer city, have more children (easier to pair them up on adventures, plus less subconscious physiological fear of losing your one and only child), distract yourself and stay busy, go with them to places the first few times to assure yourself then take off your training wheels. Or just say no to certain things.
It doesn't seem to me a special case of anxiety that can only be addressed by spy apps and knowing you might be able to instantly contact them.