Smart Altimeter app for iPhone and iPad

Smart Altimeter uses pressure sensor on your device to measure your altitude above sea level or previously chosen reference altitude (if your device does not have a barometer, the app will fall back to GPS). Advanced multiple-layer algorithms are used to smooth noisy measurements and to calculate descent rate. The app can also speak your current altitude.

Use of devices with high-speed barometric sensors (60Hz or faster) is highly recommended for the feedback lag not to exceed 0.2s (the lag is 12 samples).