# Pro Altimeter - Barometric+GPS — Manual/GPS/METAR Calibration

> Barometric and GPS altitude measurement with multiple calibration options. (iPhone/iPad app by Craig Hunter.)

- Source: https://appshunter.io/ios/app/pro-altimeter-barometric-plus-gps/id926603602 (this page in markdown: same URL + `.md`)
- Developer: [Craig Hunter](https://appshunter.io/developer/286743884)
- Category: Navigation, Utilities
- Price: $0.99
- Rating: 3.80/5 from 39 App Store ratings · 36 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 1 MB
- Languages: American English
- Released: 2014-11-03
- Data updated: 2026-08-31
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/pro-altimeter-barometric-plus-gps/id926603602/reviews.md

## What is Pro Altimeter?

Pro Altimeter uses the high-fidelity barometric pressure sensor in 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 6 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 6 hours or whenever weather changes in your area.

Pro Altimeter is intended for iOS devices with a built-in barometric pressure sensor (iPhone 6 and later, iPad Air 2 and later, iPad mini 4 and later, and iPad Pro).  On older devices without a barometric pressure sensor, only GPS altitude and accuracy will be displayed.  

If you have an Apple Watch, check out the new Pro Altimeter for Watch and get all this same functionality on your wrist!

## Key features

- Barometric and GPS altitude measurement
- Multiple calibration methods (GPS, manual, METAR)
- Real-time accuracy estimates
- Large, easy-to-read display
- Day and night display modes
- Calibration reminders

## Recent user reviews (10 of 36)

All indexed reviews: https://appshunter.io/ios/app/pro-altimeter-barometric-plus-gps/id926603602/reviews.md

### 2/5 — Eigentlich sehr gut

*2026-08-24*

Aber immer wieder gibt es Server - Update Probleme : HTTP Error 400
Seit Tagen.
Lieber Entwickler : Wieder aus dem Urlaub zurück ?

### 1/5 — App crashes instantly on iPhone 17 (iOS 26.5.2)

*2026-07-11*

Just purchased this app and it opens for 1/10th of second then crashes and disappears. 

Dev - Please update this app
asap (or remove it from the App Store and refund me)

### 1/5 — Did not work

*2026-04-17*

Paid, loaded,did not work, just wanted a simple manual input conversion tool

### 1/5 — No longer works or supported

*2026-04-12*

I downloaded this app years ago and it worked great for about 3-4 years. Amazingly accurate. Now it opens for just a few seconds then crashes. Unusable. Disappointing for an app I paid $20 for.

### 5/5 — Simple et efficace

*2026-03-02*

Application parfaite pour qui sait l’utiliser.

### 1/5 — Crashing

*2026-01-24*

Crashes in under a second.

### 1/5 — Http error 410

*2025-09-28*

Purchased version for iPhone 16pro max. Calibration with Check nearby airport gives error message: http error 410- means resource permanently removed. Why ? Make it available.

### 1/5 — Crashes right away

*2025-03-17*

Unfortunately, the app crashes as soon as you open it.

### 5/5 — App crashes when iOS permissions aren’t addressed, app is excellent.

*2025-01-04*

Bought this with the bundle after four or so years of Theodolite. That app is perfect.-edited- 
App works well! 
After making “Health and Fitness” changes to iOS settings, app functions perfectly!! Thanks for the response and feedback!

**Developer response:** As of iOS 17.4, Apple requires Motion & Fitness permission for altimeter apps to use the barometric pressure sensor.  If you have disabled Motion & Fitness on your device or have not given the app permission to use Motion & Fitness, then it will not be able to function. Once the app is able to use Motion & Fitness, it should run fine.

### 1/5 — App crashes

*2025-01-01*

Bought this with the bundle after four or so years of Theodolite. That app is perfect. This app never loads once after purchase. Would like to understand why.

## Frequently asked questions about Pro Altimeter

### What does Pro Altimeter do?

Pro Altimeter measures and computes your altitude using your iOS device's built-in barometric pressure sensor and GPS. It provides real-time altitude readings with accuracy estimates and offers various calibration methods to ensure precise measurements.

### How do I calibrate Pro Altimeter?

You can calibrate Pro Altimeter using four methods: GPS altitude, manually entering your current altitude, manually entering local barometric pressure (e.g., from a weather report), or by checking nearby airport METAR data. The app will also remind you to recalibrate periodically.

### Is Pro Altimeter free to use?

Yes, Pro Altimeter is a free application. It does not have in-app purchases or advertisements, offering its full functionality without any cost to the user.

### What devices is Pro Altimeter compatible with?

Pro Altimeter is intended for iOS devices with a barometric pressure sensor, including iPhone 6 and later, iPad Air 2 and later, iPad mini 4 and later, and iPad Pro. On older devices without a barometric sensor, it will only display GPS altitude and accuracy.

### What are the main use cases for Pro Altimeter?

This app is useful for hikers to track their elevation gain and loss, for pilots to cross-reference altimeter readings, and for general outdoor enthusiasts who want to know their precise altitude in various environments.

## Version history (last 5 releases)

### 1.1.4 — 2026-08-25

Update to handle an error in the NWS feed used to access airport data for altimeter calibration.

### 1.1.3 — 2025-09-28

Update to deal with changes in the NWS aviation weather data server used to calibrate with airport METARs.

### 1.1.2 — 2024-03-25

This version contains a workaround for privacy/permissions issues on iOS 17.4.x that block access to the barometric pressure sensor.  You will be required to grant permission for access to Motion & Fitness activity.  On devices that do not support Motion & Fitness, or in cases where the user declines permission to access Motion & Fitness activity, only GPS altitude will be shown in the app.  Please contact support@hrtapps.com if you have any questions or concerns.

### 1.1.1 — 2023-10-19

Update to handle unannounced changes in the NWS AviationWeather API that supplies airport weather data for calibration.

### 1.1 — 2022-10-19

Tweaks for iOS 16 and new devices.

## Apps similar to Pro Altimeter

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Pressure Altimeter](https://appshunter.io/ios/app/pressure-altimeter/id929307651) | 2.3 (3) | $0.99 | Navigation |
| [Aviation Altimeter Pro](https://appshunter.io/ios/app/aviation-altimeter-pro/id6749870319) | — | $2.99 | Navigation |
| [My Altitude](https://appshunter.io/ios/app/my-altitude/id465262694) | 4.8 (26,580) | Free | Navigation |
| [Airborne Flight Instrument](https://appshunter.io/ios/app/airborne-flight-instrument/id1071898324) | — | $2.99 | Navigation |
| [My Altimeter GPS Altitude Map](https://appshunter.io/ios/app/my-altimeter-gps-altitude-map/id6738959124) | 5.0 (7) | Free | Navigation |
| [Pressure Altimeter Tracker](https://appshunter.io/ios/app/pressure-altimeter-tracker/id6449918068) | 5.0 (6) | Free | Navigation |

## More apps by Craig Hunter

- [Star Race Omega](https://appshunter.io/ios/app/star-race-omega/id300776131)
- [Theodolite](https://appshunter.io/ios/app/theodolite/id339393884)
- [Wx for iPad](https://appshunter.io/ios/app/wx-for-ipad/id376956323)
- [Theodolite HD](https://appshunter.io/ios/app/theodolite-hd/id425456242)
- [Wx for iPhone](https://appshunter.io/ios/app/wx-for-iphone/id451916164)
- [Pro Compass](https://appshunter.io/ios/app/pro-compass/id517739197)

All apps by Craig Hunter: https://appshunter.io/developer/286743884

## Related topics

[pro altimeter](https://appshunter.io/ios/topics/pro-altimeter)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*