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, including on your Home and Lock Screen.

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 forecasts
• A barometer-derived forecast reads 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

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 it against the exact pressure at that moment
• Look back over time to spot your own patterns, and see a rough day coming before it arrives
• 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

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 iPhone only, because that's where the sensor lives.