[cbhl]

International travel strikes me as the sort of thing where you'd want a paid enterprise subscription instead of an offline JS app, since you'd want numbers kept up-to-date. (Just look at all the airlines integrating entry/exit test/quarantine requirement iframes.)

$dayjob gives us a mobile app from International SOS, although certainly I think there's room to make the app prettier / faster / more tolerant of spotty internet.