Alti-Barometer runs on the Apple Watch and iPhone and uses your device’s barometric pressure sensor to detect weather-related barometric pressure changes and to keep track of your altitude. Alti-Barometer can run independently on your iPhone, Apple Watch, or in combination. It supports all Watch complication styles as well as iOS 14 widgets. The app will display a continuous 24-hour log of altitude and barometric pressure, and allows you to graphically explore the collected data. It's a fun and informative way to stay connected to the natural world around you. (For Apple Watch Series 3 and higher, or iPhone version 6 or higher)