The software maps out and labels most of the constellations, planets, and objects visible with a telescope. It can also download Digitized Sky Survey Charts and superimpose images over these charts. Numerous star charts and indexes can be installed. There are also telescope interfaces and many versatile display options.
According to the programmer, Patrick Chevalley, it was released as freeware because "I’d rather see amateurs spend their money for a new eyepiece than for astronomy software".