A barometer app that shows where the pressure is heading

BaroLog reads your phone's barometer and tells you the air pressure, how it has moved over the last 3 hours, and what the forecast expects for the next 24. Your readings stay on your phone.

Get it on Google Play

Android. Free: live pressure, trend, forecast, 3-day history and the headache log. BaroLog Pro, one in-app purchase paid once: pressure-drop alerts, 7 and 30 day history, CSV export.

Main screen showing 30.13 inHg at sea level, a falling trend, and a chart of measured and forecast pressure

Chart with measured pressure as a solid line and the forecast as a dashed line

History screen with a 7-day pressure chart, minimum and maximum, and two logged headache times

Settings for pressure-drop alerts, with drop size and time window

What it does

Live pressure

From your phone's barometer, in hPa, inHg, mmHg or kPa. A running median keeps a slammed door or an elevator ride from moving the number.

Trend in plain words

Rising fast, rising, steady, falling or falling fast, with the change over 3 hours. What the words mean.

Pressure forecast

The next 24 hours of pressure for your area on the same chart as your readings. Forecast data from MET Norway, CC BY 4.0.

Sea level or your altitude

Sea-level pressure to compare with weather reports, or the raw pressure where you are. How the two relate.

Pressure-drop alerts (Pro)

Pick a drop size and a time window, such as 5 hPa within 6 hours. You get a notification about the air pressure. Android decides how often background checks run, so one can arrive late.

Headache log

Tap "Log headache" and the time is marked on the chart. That is all it does. It keeps your own record and draws no conclusions from it. What is known about weather and headaches.

Where it helps

At home, out of curiosity about the weather, or to see a front come through on the chart.
On a trail or a boat, as a second look at the trend. The barometer works without a signal. It adds to a proper forecast and doesn't replace one.
In a classroom, to compare units and to see how pressure changes with height.
Keeping notes for a doctor. Some people like a simple record of when they had a headache, to bring to an appointment. BaroLog is not a medical tool, and the evidence on pressure and headaches is mixed. Read the guide.

Free tools, no install

Sea-level pressure calculator

From a barometer reading and your elevation.

Support

Questions, bugs, or feature requests: email contact@eastframe-technology.com. A human reads every message, usually the same day. We can't give medical advice.

A 2.5-minute captioned walkthrough, recorded on iOS, shows every feature.

Frequently asked

Why does the number differ from my weather app? With "Show sea-level pressure" on, BaroLog calibrates your phone's barometer against the forecast for your area, so it matches weather reports within a few tenths. With it off, you see the raw pressure at your altitude, which is lower the higher you are.

My phone has no barometer. Many Android phones don't. BaroLog then shows the forecast pressure for your area, and alerts use the forecast.

Does it need the internet? The barometer, trend and history work without a connection. The forecast and sea-level calibration need one. BaroLog sends only an approximate position, about 10 km, to fetch the forecast.

Why did an alert arrive late? Android decides how often apps may run in the background, especially when the battery is low. BaroLog checks every time it is allowed to and every time you open it. Alerts based on the forecast can reach you hours before the pressure falls.

Is there a subscription? No. BaroLog Pro is a single purchase. Restore it on a new phone from Settings.

Is this medical advice? No. BaroLog is a barometer with a simple log. It is not a medical device, and it does not diagnose, treat, predict or prevent any condition. Its alerts are about air pressure and say nothing about how you will feel. Please talk to a doctor about headaches.

Privacy policy

Effective 6 November 2026. BaroLog is published by Eastframe Technology LLC.

What we collect: nothing. BaroLog has no account system, no analytics, no advertising, and no crash reporting service. It sends no data to us.

Pressure readings and headache notes are stored in a local database on your device until you delete them or uninstall the app. If you export them as CSV, the file goes to the app or service you choose in the share sheet.

Location and the forecast. To show the forecast and calibrate sea-level pressure, the app asks for your approximate location "while using the app". It rounds the position to about 10 km and sends only that rounded position to MET Norway, the Norwegian Meteorological Institute, to fetch the pressure forecast. No identifier, account or other data is sent with it. The rounded position is stored on your device so the forecast can refresh in the background. You can use BaroLog without location; the barometer still works.

Forecast credit. Forecast data from MET Norway, licensed under CC BY 4.0. Versions before 1.0.1 used Open-Meteo instead.

Notifications for pressure drops are created on your device. Nothing is sent to a server to deliver them.

Purchases are handled by the App Store or Google Play. We do not see your payment details. On Android, the app includes Google Play's billing library, which has the internet permission and connects to Google Play to handle purchases. Google's privacy policy applies to that connection.

Third parties. The app contains no third-party advertising or analytics code. Apart from the forecast request described above, the only external links are this page and the store's own pages, opened at your request.

Children. BaroLog is not directed at children and collects no personal information from anyone.

Changes. A new version of this policy will be published at this address with a new effective date.