> That needs to be done once, by the app's authors. Except...it also needs FDA approval as a diagnostic, etc., which is probably easier said than done. Obviou

> That needs to be done once, by the app's authors. Except...it also needs FDA approval as a diagnostic, etc., which is probably easier said than done. Obviously it's easier to distribute an app than lateral flow tests -- but the latter are much more effective too. Clearly, we should do both, and... > Reducing spread potential by 24 hours when you've perhaps been spreading it for a week already isn't exactly a game changer, but it's still useful, especially if the only thing people have to do is install an app on their watch. Expecting everyone to obtain rapid test kits and test themselves daily is in general a non-starter. This totally depends on your goals. For the individual with limited outside exposure, is knowing 24h before you feel symptoms useful? Absolutely. For a hospital or other institution (school?), who can order in bulk, and then mandate, lateral flow tests every day before work starts and observe their correct use (without having to rely on self-reported app results), the tests seem much more useful.