What APP can iPhone download to measure altitude?

Altitude table, just search for "Altitude Table" in App Store.

1. Open the APP Store in your phone.

2. Click on the search "Altitude Table".

3. Click to download and use.

Brief introduction of runtastic altimeter PRO

A tailor-made software for mountaineering enthusiasts to measure altitude. The software also has practical functions such as compass, weather information, GPS position, sunrise and sunset time. Through online service, the application can tell you the exact height of your place, and the measurement is accurate to the meter. The software has built-in photo function, which can add altitude information, and you can share your outdoor photos through Facebook or email.