Most phones allow you to make emergency calls from from the lockscreen. I wouldn’t bother with an app if my xiaomi phone allowed me to have text info on the lockscreen. Not just medical info but also "if found pls contact - "

I have this installed already. Might come in handy during the zombie apocalypse :)

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I used to do this but I’d prefer to have medical aid details, blood type and contacts accessible from lock screen.

Mind. Blown.