The crime-tracking app Citizen is now launching its personal emergency response service, promising entry to brokers who can name 911 or maintain tabs on a probably harmful state of affairs. Shield, which prices $19.99 monthly, builds on a beta program that launched earlier this 12 months. It’s half of a bigger — and typically controversial — enlargement effort on the startup, which has constructed a crime-mapping system right into a stay broadcasting platform whereas experimenting with non-public safety companies.

Citizen Shield is actually a personal security assist line that pulls on smartphone options like location monitoring. When subscribers open the Citizen app, they’ll hit a button to name a “Shield Agent” by way of video, audio, or textual content. Brokers are supposed to speak…

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