Pro Altimeter is the newest app from Hunter Research, developer of the popular outdoors apps Theodolite, Pro Compass, and Nav Camera. Pro Altimeter uses the high-fidelity barometric pressure sensor in new iOS devices to measure and compute altitude.

Pro Altimeter has a dead simple interface. Barometric altitude and GPS altitude are displayed in large easy to read numbers, showing units of both feet and meters, and giving realtime accuracy estimates from the hardware. At bottom are calibration and display mode buttons. The display offers a highly-readable daytime mode with black digits on an LCD-green background, and a reversed night mode that is easy on the eyes in dark conditions. That's it!

Proper calibration is necessary to measure altitude from barometric pressure (this is why a pilot "dials in" the cockpit altimeter before taking off). Pro Altimeter offers four different methods for calibration -- choose the easiest and most convenient:

1. Use GPS altitude. This method correlates the measured local barometric pressure with the altitude measured by GPS. This method can be used when your device has a clear line of sight to the sky and a reliable GPS fix with good accuracy.

2. Manually enter altitude. This method correlates the measured local barometric pressure with known altitude from landmarks, elevation benchmarks, trail markers, topo maps, land surveys, etc. Altitude can be entered in feet or meters.

3. Manually enter pressure. If you have a weather station, weather report, or METAR report with equivalent sea level pressure for a nearby location, this can be used to correlate local barometric pressure to altitude. Pressure can be entered with units of inches Hg, kPa, or mb.

4. Check local airports. With the tap of a button, Pro Altimeter will locate the five closest airports within 100 miles (160km) of your present location anywhere in the world, and pull in METAR data. From that list of five, pick the airport of your choice and Pro Altimeter will import pressure data for calibration.

Once calibrated, Pro Altimeter keeps track of the time since its last calibration. Because weather and local barometric pressure change over time, the app will warn you when 12 hours have elapsed since the last calibration by flashing the "CALIBRATE" button. You should calibrate as frequently as practical -- for example, on a hike, calibrate whenever you pass a trail marker or elevation benchmark. But at a minimum, calibrate at least every 12 hours or whenever weather changes in your area.

Pro Altimeter is intended for recent model iOS devices with a built-in barometric pressure sensor which include the iPhone 6/6+, iPhone 6S/6S+, iPhone 7/7+, iPad Air 2, iPad Pro, and iPad mini 4. On older devices without a barometric pressure sensor, only GPS altitude and accuracy will be displayed.

What’s New

Version 1.0.1

This app has been updated by Apple to use the latest Apple signing certificate.

Fix to interface layout for devices running system wide display zoom.

If you're happy with Pro Altimeter, please leave us a review on iTunes. It only takes a minute, and helps a lot. Reviews establish the app and improve sales, in turn providing support for future development. Thanks!

Ratings and Reviews

4.0 out of 5
29 Ratings

29 Ratings

App_User_Beta ,

Pro Altimeter Update

This version of the App has effectively resolved an issue related to display on IPhone6. The app is easy to calibrate and read due to the larger text. Well worth the 0.99 cents.

CC50 ,

Great calibration. How about some functionality?

Love the multiple methods of calibration and the accuracy it provides… but now this app needs some features to make it useful.
Climb and descent rate measured over time or between pre-determined altitudes for us climbers and skiers.
The ability to display change in altitude over time in both data table (exportable to spreadsheet) and graph/graphic form.
Altitude alarms to signal when a particular altitude has been reached.

Barometer: pressure change over time is a good indicator of weather trends. How about recording pressure at user selectable time intervals in the background and then displaying collected data in table form (exportable to spreadsheet) and graph/graphics forms?
Maybe display airport data on a map so user can see surrounding pressure readings and get a picture of pressure trends in area?

App is a good start from an accuracy, calibration point of view. Now add some useful functionality.

Patriot96796 ,

Almost perfect

Great app!!! If you just added a couple other instruments it would be perfect! But I'm giving it 5 stars anyway because of the calibrate feature. Where it goes out and gets baro from metars automatically when selected.

App Privacy

The developer, Hunter Research and Technology, LLC, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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