[ant6n]

I'm in Germany and I don't know anybody who uses such apps. I wonder what their reach is.

[dgellow]

You don’t have the NINA app? You have broadcast relatively often (multiple time a year) due to fires, active shooting, flood risk, etc. At least in Hamburg. It’s pretty useful.

https://www.bbk.bund.de/DE/Warnung-Vorsorge/Warn-App-NINA/wa...

[MandieD]

It also displays by default in usable English on an iPhone when the phone's interface language is set to US English (haven't tested UK English).

[piceas]

I use KATWARN because the local refinary, usually downwind of where I live, is required to announce if there is an incident (within 48 hours, probably).