Zambretti Barometer

Turn your iPhone into a precision barometer.

Your iPhone has a real barometric pressure sensor built in. Barometer puts it to work. See live sea-level pressure, watch the 3-hour trend, and get an early heads-up before the weather turns. Everything reads at a glance - on your Home Screen, your Lock Screen, and now your wrist.

A live pressure gauge
A beautiful, crafted dial shows your current mean sea-level pressure with a live 3-hour trend - rising, falling, or steady - plus clear 6-hour and 24-hour reference markers so you can see exactly where things are heading.

History at a glance. Scroll back through 24 and 48 hours of pressure on a clean chart, so a passing front or a building high is obvious.

Storm & clearing alerts
• Barometer-derived alerts read your pressure and its trend to call storms early and tell you when it's clearing
• Delivered as on-screen banners and optional background notifications, so you're warned even when the app is closed

A classic barometer forecast. The time-honoured Zambretti method turns your pressure, trend, and wind into a plain-language forecast - computed from your own barometer, correct for both hemispheres.

Feel the weather before you see it
Many people sense pressure changes in their body before the sky shows a thing: headaches, migraines, sinus pressure, aching joints. Barometer helps you connect the two.
• An optional wellbeing log records how you feel and stamps each entry with the real pressure you were experiencing - the actual air around you, not just the sea-level number
• A summary builds as you log, showing what the pressure was doing when you felt off - falling, steady, or rising, low or high
• Look back over time to spot your own patterns
• Private to you, kept on your device, never shared

Your sensor vs. Apple Weather
Barometer pulls in Apple Weather for temperature, wind, and the official sea-level pressure, then shows your iPhone's own sensor reading side by side - so you see your exact local conditions, not just the nearest station.

Built-in widgets
• Live pressure on your Home or Lock Screen
• The 3-hour trend, a 24-hour chart, and any active storm alert
• One glance away, no need to open the app

On your wrist
• An Apple Watch app with your live pressure, trend, and 24-hour chart
• A watch-face complication so the current reading is always one glance away
• Stays fresh on its own with Apple Weather, even when your phone is out of reach

Made yours
• Eight hand-crafted colour themes, with System, Light, and Dark appearance
• Your choice of pressure, temperature, wind, and elevation units
• A recording log of every reading, with one-tap CSV export

Extra tools
• Density altitude for shooting and ballistics, in feet or metres

Private by design. No account, no sign-up, no tracking. Your readings stay on your device.

Barometer is built for iPhone - that's where the sensor lives. An Apple Watch app and complication keeps your latest reading a glance away on your wrist.