iPhone App: SkyVoyager

SkyVoyager is a powerful astronomy app for the iPhone, iPad, and iPod Touch. It is designed for both beginners and advanced users. It contains a database of 300,000 stars to 10th magnitude, and 30,000 deep sky objects, including the entire NGC and IC catalogs. It renders the planets and moons in detail, using NASA mission imagery, and includes a database of several hundred asteroids, comets, and artificial satellites.

iPhone App: iStellar

iStellar is a mobile planetarium and astronomy app for iPhone and iPod Touch. Based on the time and location setting input by the user, iStellar able to display the stars on the night sky for the given location. Information obtained through the GPS function, iStellar will chart the location of stars and will rotate according to the position detected by the position sensor. It is optimized for Multi-Touch control, allowing you to operate intuitively; drag to move the star chart, pinch to zoom in and out, and so on.