Apollo is recognized by its outstanding MP3 decoding quality, powerful continuous playback support and advanced playlist capabilities. It supports different file formats through so called input plug-ins. Writing an input plug-ins is rather straight forward and thus Apollo can be easily made to support new audio formats.

The player routines provide continuous playback or even a crossfade between tracks on all supported formats and with all output types. It is possible to direct the output into a WAV file, thus making it possible, for instance, to decode MP3s for writing them onto a CD. The player routines also provide a realtime 16-band equalizer for all file types.