Optional — needs internet.
Earthquakes only (Richter).
Storms, floods, tsunami… (GDACS level).
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Move the device to see the trace react. Nothing is recorded or uploaded.
When your device shakes it shares only a coarse grid cell + a timestamp — never your exact location. The more people join, the earlier everyone is warned. Works worldwide.
Test tool — triggers demo/drill alerts only.
Only earthquakes within this distance concern you.
Weaker quakes are shown on the map but never alarm.
Also get warned for family & friends — add their city.
Shows the live-server test panel in the Network tab.