Question 1

How does the barometer work?

Accepted Answer

It uses the browser Ambient Pressure Sensor API (Barometer) available on supported Android devices to read atmospheric pressure in hectopascals (hPa).

Question 2

How is altitude calculated?

Accepted Answer

Altitude is calculated from atmospheric pressure using the international barometric formula. Sea-level pressure is assumed at 1013.25 hPa unless you enter your local value.

Question 3

What does a falling pressure mean?

Accepted Answer

A falling barometer typically indicates deteriorating weather — rain or storms are coming. A rising barometer suggests improving or stable weather conditions.

Question 4

Is my pressure data private?

Accepted Answer

Yes. All sensor readings stay in your browser. Nothing is uploaded to any server — 100% private.