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Four months after Apple and Google announced an unusual collaboration to help public-health authorities track the novel coronavirus, apps built on their privacy-optimized Exposure Notification framework have begun arriving in the U.S.

The first, Virginia’s COVIDWISE, debuted Aug. 5. North Dakota and Wyoming shipped their Care19 Alert Aug. 13, Alabama launched its GuideSafe app Aug. 17, and Nevada introduced COVID Trace on Monday. The University of Arizona is testing Covid Watch Arizona, with a statewide release expected soon.

They work by sharing anonymous Bluetooth beacons with nearby devices running the same software, tagging those that suggest extended and close contact associated with coronavirus spread, and saving the last 14 days of these records.

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