# Alt-O-Meter — An Air Pressure Altimeter

> Barometer-based altimeter for precise altitude readings on iPhone and iPad. (iPhone/iPad app by Joshua Hinman.)

- Source: https://appshunter.io/ios/app/alt-o-meter/id1073846820 (this page in markdown: same URL + `.md`)
- Developer: [Joshua Hinman](https://appshunter.io/developer/1073846819)
- Category: Navigation, Health & Fitness
- Price: Free
- Rating: 4.50/5 from 8 App Store ratings · 14 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 3 MB
- Languages: English
- Released: 2017-01-07
- Data updated: 2026-08-03
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/alt-o-meter/id1073846820/reviews.md

## What is Alt?

Alt-O-Meter uses the barometer (air pressure sensor) in your late-model iPhone or iPad to calculate your precise height above sea level. Great for hiking, skiing, driving through mountain passes, flying, and more!

 • Reads ambient air pressure for a more precise reading than GPS.
 • Realistic, retro style. Looks like a classic airplane's altimeter!
 • Automatically calibrates for local atmospheric pressure.
 •  ...also allows precise user calibration (optional; for advanced users)
 • Uses GPS hardware in devices that lack a barometer.
 • Completely free! No ads or in-app purchases.

## Key features

- Barometer-based altitude calculation
- GPS fallback for devices without barometer
- Automatic local pressure calibration
- Optional user calibration
- Retro-style interface
- Precise height above sea level

## Recent user reviews (10 of 14)

All indexed reviews: https://appshunter.io/ios/app/alt-o-meter/id1073846820/reviews.md

### 5/5 — Good it can display hPa units now…

*2024-04-13*

…But lacks hPa decimal for more precise calibration, also direct altitude calibration would be great.
No ads : great feature !

### 5/5 — As close as you get to a flight-certified alitimeter without actually being one

*2024-04-02*

Update: The dev's very responsive reply fixed the issues and my Alt-O-Meter is back to "it just works"! Thank you, dev, for the quick reply!  5* and well deserved.

Kollsman window & QNH missing. QNH no longer settable or reported. Auto Calibrate button now called "Start Updates"; when active, nothing much happens but the 100' pointer hunts erratically by a few feet. iPhone 12pro/iOS 17.4.1/app v.2.1 Those issues aside, this app holds truest to an aviation altiimter of all the others Restoring the auto-calibrate feature a while back was a big plus. Hoping the current glitches are only temporary... 5-star app! (-1 for the current issues).

**Developer response:** Thanks for the review! I’m glad you’re enjoying the app. In regards to your issue, please go to Settings->Alt-O-Meter and ensure that you’ve enabled the “Motion & Fitness” permission. The app needs that enabled in order to detect your ambient air pressure, otherwise it falls back on showing GPS altitude. No other motion or fitness data will be accessed by the app; only ambient air pressure. 

Thanks again for using my app, and I’m glad you’re enjoying it!

### 4/5 — v2.1 has a couple of new glitches

*2024-03-30*

Kollsman window & QNH missing. QNH no longer settable or reported. Auto Calibrate button now called "Start Updates"; when active, nothing much happens but the 100' pointer hunts erratically by a few feet. iPhone 12pro/iOS 17.4.1/app v.2.1 Those issues aside, this app holds truest to an aviation altiimter of all the others Restoring the auto-calibrate feature a while back was a big plus. Hoping the current glitches are only temporary... 5-star app! (-1 for the current issues).

**Developer response:** Thanks for the review! I’m glad you’re enjoying the app. In regards to your issue, please go to Settings->Alt-O-Meter and ensure that you’ve enabled the “Motion & Fitness” permission. The app needs that enabled in order to detect your ambient air pressure, otherwise it falls back on showing GPS altitude. No other motion or fitness data will be accessed by the app; only ambient air pressure. 

Thanks again for using my app, and I’m glad you’re enjoying it!

### 5/5 — Soon adapted

*2023-12-30*

very nice design but lack the hpa setting (or mbar). So not friendly in our European countries .

Update Déc 2023: hpa setting is there. A very useful app to have.
Thanks Joshua!!

### 5/5 — Awesome!

*2021-08-06*

I love this app! Also useful for baking as recipes need to be adapted for the altitude. Love it!

### 3/5 — Needs hPa

*2021-03-31, version 1.1*

You need to be able to see/set pressure in hPa (which most of the world uses) as well as inHg (which is used in only a few countries).

### 4/5 — Works well; but only QNH is user settable

*2019-05-21, version 1.1*

It would be very handy for hiking to be able to sit to the known altitude at this location, or the stored altitude of other locations. Display is attractive and easy to read and filters noise out of the pressure readings.

### 4/5 — Need’s metres

*2019-01-31, version 1.1*

Love this app. But it would be useful to be able to switch it into metres.

### 4/5 — Simple and clean design

*2018-08-25*

Nice clean design and does almost exactly what I need except doesn’t support the rest of the world’s standard units. Any chance you could add mbar’s/hPa for the QNH setting, and meters for altitude? They do need to be separate settings as some countries like Australia use hPa for pressure but feet for aviation altitude.

**Developer response:** Version 2.0 is now available with support for metric units. Enjoy!

### 5/5 — Great

*2018-07-28, version 1.1*

Best ever

## Frequently asked questions about Alt

### What is Alt-O-Meter?

Alt-O-Meter is a free application that uses your iPhone or iPad's barometer to determine your precise altitude above sea level. It can also use GPS on devices that lack a barometer.

### How accurate is Alt-O-Meter?

It provides more precise readings than GPS alone by utilizing ambient air pressure. The app automatically calibrates for local atmospheric pressure, and advanced users can perform optional manual calibration.

### Does Alt-O-Meter have ads?

No, Alt-O-Meter is completely free with no advertisements or in-app purchases, offering an uninterrupted user experience.

### What devices support Alt-O-Meter?

Alt-O-Meter is compatible with both iPhone and iPad devices, leveraging their built-in sensors for altitude measurement.

### How often is Alt-O-Meter updated?

The app was last updated on March 18, 2024, indicating active development and maintenance by the developer.

### What is the age rating for Alt-O-Meter?

Alt-O-Meter has an age rating of 4+, making it suitable for a wide range of users, including children.

### Can Alt-O-Meter be used offline?

Yes, as it relies on the device's barometer or GPS, Alt-O-Meter can function effectively even without an internet connection, making it ideal for remote areas.

### What makes Alt-O-Meter different from GPS altitude?

Alt-O-Meter uses the barometer to measure air pressure, which is a more direct indicator of altitude than GPS. This method generally leads to more accurate and responsive altitude readings.

## Version history (last 4 releases)

### 2.1 — 2024-03-18

Fixed a bug that caused the altimeter to display the incorrect altitude in a recent version of iOS

### 2.0 — 2023-11-23

* Uses the new Apple Weather API
* Dark mode support
* Support for metric units

### 1.1 — 2018-04-16

This app has been updated by Apple to display the Apple Watch app icon.

iPhone X Support

### 1.0 — 2017-01-07

No release notes.

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## Related topics

[joshua hinman](https://appshunter.io/ios/topics/joshua-hinman) · [hinman](https://appshunter.io/ios/topics/hinman)

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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 2026-08-03.*