The app was downloaded and set up by over 1M users and the latest stable release was on Sep 22, 2020. In-app purchase items and ads can be found in Altimeter. This application is very popular among Samsung and LG users.
You can download the .apk installer of Altimeter 3.0.3 for free and read users' reviews on Droid Informer. This file size doesn't exceed 5 MB and the app runs flawlessly on Android 4.1 and above.
From the users' point of view, the advantage of the app is a good interface, but some people indicate that the weak side of this application is many ads.