No Signal? No Problem.
From sailing to backcountry hikes to migraine tracking. Your phone’s barometer works offline, so you can track pressure changes anytime, anywhere.
Barometric pressure, forecasts, and offline tracking.
Read sea-level pressure and altitude directly from your iPhone, even offline. Review local history, add notes, explore pressure forecasts from Today to 16 days, and get alerts when pressure changes fast.
Forecasts up to 16 days
Pressure change alerts
Migraine tracker
Widgets, History & Notes
Export to CSV & JSON
No account required. Your sensor history stays on device.
The app uses your device sensors to calculate sea-level pressure directly on
device. Internet access is only needed to download forecast data.
Features
Track what pressure is doing now and what comes next.
Barometer combines on-device readings with location-based pressure forecasts, clear history, useful alerts, and quick access from widgets.
Alerts for pressure changes
Get notified about rapid changes detected by your device or expected during upcoming forecast days.
Pressure forecasts up to 16 days
Explore Today, 72-hour, 7-day, and 16-day charts. Use your location or search for a city, inspect hourly values, and compare daily minimums, maximums, and tendency.
16-day ForecastWidgets, notes, and export
Add widgets to your lock and home screen, annotate important moments, and export your history to CSV or JSON.
Built For Daily Tracking
Pressure trends you can actually use.
Compare what your device is measuring with what is forecast for the coming hours and days, then add notes when a condition, symptom, or event matters.
Track atmospheric pressure and altitude
Read both values directly from the device and keep a local history over time.
See what is coming next
Follow hourly forecast charts, inspect individual values, and review each day’s minimum, maximum, and pressure tendency.
Helpful for weather and body awareness
Pressure alerts can help you notice patterns related to storms, headaches, migraines, asthma, arthritis, and more.
Loved by Barometer users
Their words, not ours.
Swipe through real App Store reviews
★★★★★
Amazing app and developers
“Firstly, this app is exactly what I've been looking for to help me track barometric pressure, notice past trends as they correlate to my migraines, and get alerts for the future so I can hopefully prevent migraines before they start. …”
★★★★★
Perfect app, recommend for POTS/EDS/ Hypermobile tracking
“First it’s pay once not a subscription and not expensive. … 1 record the barometric pressure, 2 warn me of sudden changes up or down and 3 it lets me export the data so I can overlay it against my health or other data.”
★★★★★
Great app
“Very easy to use and I really like that it still works even without an internet connection”
★★★★★
Elegantly effective
“This does exactly what I was looking for to get notifications of pressure drops to assess correlations with migraine attacks. It does this with a good clean interface, doesn’t collect user data, and has an entirely reasonable one-time purchase fee for the full feature unlock.”
★★★★★
Love this app!
“I have tried so many barometric apps. I need to keep track of barometric pressure thanks to migraines and tinnitus. With that in mind, I would like to request that the dev re-add the ability to have a notification/alarm when the barometric pressure goes up. Changes in either direction are important to monitor for a certain population. Everything else is great! Thank you for offering this for free today too!”
FAQ
Common questions
Where does the pressure data come from?
Local readings and history come from the device’s pressure and altitude sensors. Forecast uses weather data for the city or location you select.
Does it need internet access?
Local readings and saved history work offline. Internet access is required to search locations and download or refresh forecast data, but cached forecasts remain available without a connection.
Why might the app ask for motion, location, or Wi-Fi?
Depending on the device and iOS version, Apple may require Motion and Fitness, Location, or Wi-Fi to expose altitude and pressure data correctly. Location also lets Forecast show your current city, but you can search for a city manually instead.
How do I get better history data?
Turn on Background App Refresh for Barometer and avoid force-quitting the app from the app switcher. iOS decides the background schedule over time.
Download
Track pressure now and plan for what comes next.
Barometer is built for hikers, sailors, migraine tracking, weather enthusiasts, and anyone who wants local readings and pressure forecasts in one place.