Table 1.

Summary of national COVID-19 mHealth applications released by India and Vietnam

Country	Application name	Release date	Adoption	Functions
India	Aarogya Setu	April 2, 2020	50 million downloads within first 2 weeks of launch	Risk assessment of contracting COVID-19
			100 million downloads 1 month after launch	Likelihood of having COVID-19 based on self-reported symptoms
				Exposure tracking and notification
				Information dissemination
				Electronic passes for movement through checkpointsa
				Telemedicine (virtual doctor visits, home laboratory testing, and home medication delivery)a
				Electronic vaccination verificationa
Vietnam	Vietnam Health Declaration application	March 9, 2020	>1 million downloads before being retiredb	Medical declaration upon entry of country at airport or border
				Electronic passes corresponding to medical declaration
	NCOVI	March 9, 2020	7.2 million 4 months after launch	Voluntary symptom logging
				Telemedicine (triaging services provided by healthcare professionals)
				Information dissemination
				Mapping of suspected positive cases based on symptom logs
				Electronic passes for checkpointsa
	Bluezone	April 18, 2020	200 000 downloads 3 months after launch	Exposure tracking and notification
			20 million downloads 4 months after launch	Information dissemination
	PC-Covid	September 30, 2021	Over 3.6 million downloads in the first month after launch	Medical declaration upon entry of country at airport or border
				Voluntary symptom logging
				Exposure tracking and notification
				Telemedicine (scheduling tests and vaccinations)
				Information dissemination
				Electronic domestic travel passes and vaccination cards
				Mapping of suspected hot spots based on symptom logs and reported test results

^aFunctions added in updates after initial application release.

^bDownloads by month after release not disclosed.