A complete aviation altimeter running inside your Apple Watch Series 3 or higher!

A real barometric Altimeter, not GPS-based. A real Altimeter dial with digital readout!

This altimeter allows you to set the field altimeter setting or QNH. The Altitude can be displayed in Feet, Meters, or Flight Level. You can also display the raw barometric pressure. The kollsman window allows setting the local pressure in either inches of mercury or hectoPascals (millibars). Completely International!

Once you load the App from your phone and set your preferences with the companion iPhone App, the watch Altimeter is completely independent of the phone. Use this App without a phone nearby and without any internet connection. Set Preferences directly on the watch by Swiping left.

An extra bonus feature is an oxygen alarm to remind you haptically and visually when you exceed 12,500 ft. The alarm only functions when the Altimeter App is running on the face of the watch!

This app is Flight Tested, but NOT FAA TSO-certificated and can not be used as a primary flight instrument!

This App only works on Apple Series 3 and later Watches! Remember to allow the app to use the Fitness & Motion sensors in "Settings"

Swipe left to change Units, swipe right for Density Altitude, tap the button to adjust the Station Pressure.

What’s New

Version 2.03

Squashed a bizzarre bug where the app only reported a fixed altitude. Also refined sensor coding and other minor, internal performance tweaks.

Ratings and Reviews

3.8 out of 5
9 Ratings

9 Ratings

Booboolaaas ,

Series 4 screen size

I purchased app today and very happy with it but it does not look like it fits well on the series 4 44mm watch, it looks like an egg shaped display. I hope it’s not the final version and j hope there will be a fix for this because it looks awkward.

Developer Response ,

Thanks for the feedback! The graphics guru has been kicked ;). The fix is now available for free update in the App Store.

stashoo99 ,

Developer Helped Get Mine Workimg

Message appears to authorize access to watch barometer. Ok does nothing. Message comes back. Emailed developer. No response. Will adjust review when problem is fixed.

I am revising my review. It now works and developer has added instructions. Thank you. My only gripe is that the top and bottoms of the altitude digits are cut off on my watch. I can still read the altitude but it takes a minute to interpret the numbers.

REVISING AGAIN. Digit clipping is fixed in latest version. With local altimeter setting the altimeter is quite accurate. So much better than GPS estimates. I can usually get current altimeter setting by asking SIRI. Nice APP

Developer Response ,

Version 1.04 handles the Series 4 screen sizes better. This should fix the digit clipping. Thanks for revising your review!

Sorry for the delayed response here. We did get a single query on this issue from someone named Stan and we responded the same day to that person’s reply address.
There is nothing wrong with the App. As with so many things in the Appleverse, a user must explicitly give permission to a device to access certain features, barometers included. Most users have already turned this permission on by the time they get the Altimeter App. We apologize for not giving explicit direction for this issue. Here goes the easy fix:

On the paired iPhone, open Apple’s Watch App.
Scroll down the main view to “Privacy”
Turn On “Fitness Tracking”. That’s it! Fitness tracking enables all the motion sensors, accelerometers, and barometer on the watch for use by Apps.

Please consider revising your negative review.

Heli-AV8R ,

Works great!

Had an issue at first with a bug, but developer quickly addressed my issue, applied an update to fix the bug, and the app works just as it’s supposed to. Best baro altimeter app I’ve seen so far. Maybe a watch complication would be a nice addition to the app, but it’s great as it is! Thank you! I changed my review!

Developer Response ,

Profound Apologies! For reasons unfathomable, on your watch the App thinks it is running on the Apple Developer's Simulator. This should obviously not happen. A new version will get uploaded today with the debugging branch removed. Very sorry for the inconvenience! The app is no joke, it is sensitive to pressure changes equivalent to 2-3 feet of altitude near sea level and it has been flight tested up to about 10,000 MSL.


Aviametrix, LLC
23.8 MB

Requires iOS 11.4 and watchOS 4.3 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

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

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